145 results on '"Jyehong Chen"'
Search Results
2. Sparsity-Tuned Elastic Net-Pruned Volterra Equalization for 80 Gb/s PAM4 Transmissions for Optical Inter-Data Centers Interconnects
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Govind Sharan Yadav, Chun-Yen Chuang, Kai-Ming Feng, Jhih-Heng Yan, Jyehong Chen, and Young-Kai Chen
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Atomic and Molecular Physics, and Optics - Published
- 2022
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3. Microring Optical Phase-Shifters With Low Driving-Voltage, Low Insertion Loss, and Small Residual Amplitude Modulation
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Jason Jyehong Chen, Yinchieh Lai, Zohauddin Ahmad, Yung Jr Hung, Rui Lin Chao, and Jin-Wei Shi
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Amplitude modulation ,Interferometry ,Multi-mode optical fiber ,Materials science ,business.industry ,Dynamic range ,Phase (waves) ,Optoelectronics ,Insertion loss ,business ,Phase shift module ,Phase modulation ,Atomic and Molecular Physics, and Optics - Abstract
Novel microring based optical phase-shifters on Si-photonic platforms for microwave photonic applications are demonstrated. By using an add-drop microring structure in combination with an additional multimode interferometer (MMI), pure phase modulation with an ultrahigh modulation efficiency can be realized. Comparison is made to the reference all-pass ring design with both the same radius (5 m) and coupling coefficient (: ~0.2). The demonstrated structure minimizes the residual amplitude modulation (0.9 vs. 1.8 dB) for nearly 2 phase shifting over a wide optical window (1520 to 1570 nm) at the expense of a larger insertion loss (0.06 dB) due to the additional MMI. The demonstrated phase shifter structure is implemented in a Mach-Zehnder interferometer (MZI) for further study of its dynamic and linearity performance. Under forward bias, it exhibits a low V/I(0.4 V/12.7 mA), fast rise-time (3 ns), low insertion loss (0.2 dB), low residue-amplitude-modulations (
- Published
- 2021
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4. Enhanced Velocity Sensitivity in 4-D FMCW LiDAR by Use of Avalanche Photodiode with Cascaded Multiplication Layer
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Zohauddin Ahmad, Sung-Yi Ou, Wei-Chih Su, Po-Shun Wang, null Naseem, Jyehong Chen, Yung-Jr Hung, You-Chia Chang, Chia-Chien Wei, Tzyy-Sheng Horng, and Jin-Wei Shi
- Abstract
A 4-D FMCW LiDAR is demonstrated. In comparison to the traditional p-i-n PD in its receiver-side, the cascaded M-layers APDs provide a better quality of 4-D images with unprecedented high velocity- sensitivity (5µm/sec) for slow-moving objects.
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- 2023
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5. DP-QPSK Coherent Detection Using 2D Grating Coupled Silicon Based Receiver
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Ching-Wei Peng, Chi-Wai Chow, Yinchieh Lai, Chien-Hung Yeh, Jyehong Chen, Guan-Hong Chen, and Pin-Cheng Kuo
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lcsh:Applied optics. Photonics ,Physics ,Silicon photonics ,business.industry ,Bandwidth (signal processing) ,lcsh:TA1501-1820 ,Silicon photonic (SiPh) ,Optical polarization ,Grating ,Atomic and Molecular Physics, and Optics ,Photodiode ,law.invention ,Silicon-germanium ,coherent detection ,chemistry.chemical_compound ,chemistry ,law ,dual-polarization quadrature-phase-shift-keying (DP-QPSK) ,lcsh:QC350-467 ,Optoelectronics ,Electrical and Electronic Engineering ,business ,lcsh:Optics. Light ,Beam splitter ,Digital signal processing - Abstract
We propose and demonstrate a 100 Gbit/s silicon photonic (SiPh) coherent receiver (Rx) with advanced digital signal processing (DSP) for dual-polarization quadrature-phase-shift-keying (DP-QPSK) transmission. It employs integrated 2D polarization-splitting grating couplers (2D-GCs), modified hybrid mixers and high speed silicon-germanium (SiGe) photodiodes (PDs). The 2D-GC replaced the polarization beam splitters and rotators needed in traditional coherent Rx. Moreover, the SiGe PD has the bandwidth >50 GHz.
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- 2021
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6. >87%Complexity Reduction at 25-GS/s, 50-Gbps and 30-dB Loss Budget LR-OFDM PON using Digital Predistortion
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Hong-Minh Nguyen, Chia-Chien Wei, Chun-Yen Chuang, and Jyehong Chen
- Abstract
We demonstrate the digital predistortion (DPD) at a reduced sampling rate in high-loss-budget 10G-class LR-PONs. A >50-Gbps transmission was achieved over 30-70 km using fixed DPD with >87% complexity reduction, compared to fully optimized DPD.
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- 2022
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7. Artificial Neural-Network-Based Pre-Distortion for High Loss-Budget 60-km Long-Reach Passive Optical Network
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Chia-Chien Wei, Szu Chi Huang, Chun-Yen Chuang, Jason Jyehong Chen, and Hong Minh Nguyen
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nonlinear distortion ,Intensity modulation ,General Computer Science ,Computer science ,Orthogonal frequency-division multiplexing ,General Engineering ,Optical power ,Energy consumption ,neural networks ,Passive optical network ,optical fiber communication ,Transmission (telecommunications) ,Nonlinear distortion ,Wavelength-division multiplexing ,Electronic engineering ,General Materials Science ,Fading ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:TK1-9971 ,predistortion ,OFDM - Abstract
High launch optical power can compensate for severe fading and power loss in long-reach passive optical networks (LR-PONs); however, it also aggravates nonlinear degradation, which necessitates the use of complex DSP-based nonlinear compensation techniques at optical network users (ONUs). DSP-related techniques also necessitate the use of additional hardware/software components by the receiver, which can greatly increase implementation costs and energy consumption, particularly when dealing with large-scale ONU deployment. This is the first study to propose artificial neural network (ANN)-based pre-distortion to eliminate the need for complex DSP at ONUs in a high-launch-power LR-PON, thereby permitting the use of a simplified architecture at the user end. In the first phase of the study, the proposed ANN-based pre-distortion scheme was implemented in a single-channel IMDD OFDM LR-PON, which achieved a data rate of >55 Gbps over 60-km transmission with a loss budget of 30 dB without the need for optical inline- or pre-amplification. In the second phase of experiments, the same scheme was applied to a 4-channel wavelength division multiplexing (WDM) OFDM LR-PON. Here, the proposed scheme achieved data rates of >200 Gbps using launch power of 18 dBm per lane, resulting in a loss budget of roughly 29 dB over 60-km single mode fiber transmission.
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- 2020
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8. Three-Port Optical Phase-Shifters and Modulators With Ultra-High Modulation Efficiency, Positive RF-Linking Gain, and Low Residual Amplitude Modulation
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Jyehong Chen, Yinchieh Lai, Zohauddin Ahmad, Jin-Wei Shi, and Rui Lin Chao
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Silicon photonics ,Materials science ,silicon photonics ,General Computer Science ,business.industry ,Bipolar junction transistor ,General Engineering ,Phase (waves) ,Biasing ,RF-linking gain ,Optical phase shifter ,Amplitude modulation ,Fall time ,photonics integrated circuits ,Optoelectronics ,Insertion loss ,General Materials Science ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,business ,lcsh:TK1-9971 ,Refractive index - Abstract
A three-port optical phase-shifter and Mach-Zehnder modulator (MZM) based on PNP-type bipolar junction transistor (BJT) is demonstrated. Significant plasma (injected carrier) induced changes of the refractive index for the optical waveguide become possible with an extremely small driving-voltage and a compact device size during operation of this BJT between the saturation and forward active modes. Devices with a standard MZM structure and a small foot-print (0.5 mm) exhibit a moderate optical insertion loss (2 dB), extremely small Vπ (0.18V) and Pπ (0.21mW), fast rise/fall time (~1ns), and a residue-amplitudemodulation (RAM) as small as 0.18 dB. Furthermore, thanks to the ultra-high modulation efficiency characteristic of our device, a +4.0 dB net RF-linking gain can be obtained under dynamic operation. Compared to 2-port (base-collector) forward bias operation, under three-port operation, the extra bias current from the base-emitter junction provides a lower Vπ (0.18 vs. 0.22 V), a smaller RAM (0.18 vs. 0.6 dB), and a larger RF-linking gain (+4 vs. -3.2 dB). The superior performances of the three-port to two-port operations can be attributed to the additional forward bias B-E junction being able to provide more injected carriers to induce stronger plasma effects for optical phase-shifting.
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- 2020
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9. Exercise Vital Signs Detection Employing FMCW Radar and Artificial Neural Networks
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Vincent Wu, Lindor Henrickson, Shih-Hsuan Lai, Kyle Cheng, King Leong Li, Jyehong Chen, and Irwin Chen
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Continuous-wave radar ,Lidar ,Artificial neural network ,law ,Computer science ,Real-time computing ,Fast Fourier transform ,Vital signs ,Continuous wave ,Radar ,Frequency modulation ,law.invention - Abstract
We present a frequency modulated continuous wave (FMCW) radar system for non-contact heart rate monitoring during exercise. 90% accuracy predictions are achieved by employing a modified MobileNetV3 model for regression analysis.
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- 2021
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10. Structured Sparsity Learning-based pruned retraining Volterra Equalization for Data-Center Interconnects
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Chun-Yen Chuang, Young-Kai Chen, Kai-Ming Feng, Jyehong Chen, and Govind Sharan Yadav
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business.industry ,Computer science ,Speech recognition ,Equalization (audio) ,Retraining ,Bit error rate ,Learning based ,Augmented reality ,Data center ,business ,Signal ,Degradation (telecommunications) - Abstract
We propose a structured sparsity learning-based pruned retraining Volterra equalization for inter-dadta-center interconnects. Compared with conventional VE, we achieve 95% and 90.5% complexity reduction without signal degradation for B2B and 40-km at 80-Gb/s PAM4, respectively.
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- 2021
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11. >55-Gbps and 30-dB Loss Budget LR-OFDM PON Downstream Enabled by ANN-based Predistortion
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Szu Chi Huang, Chun-Yen Chuang, Hong-Minh Nguyen, Jyehong Chen, and Chia-Chien Wei
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Signal processing ,Nonlinear distortion ,Orthogonal frequency-division multiplexing ,Computer science ,Electronic engineering ,Downstream (networking) ,Passive optical network ,Predistortion ,Power (physics) ,Compensation (engineering) - Abstract
We proposed the ANN-based predistortion to mitigate nonlinear distortion in a 25- to 70-km IM/DD OFDM PON. Using 18-dBm launch power, the >55-Gbps downstream with 30-dB loss budget was demonstrated without nonlinear compensation at ONUs.
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- 2021
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12. Handling Multilayer Neural Network Nonlinear Equalizer Complexity and overfitting Challenges Using L1-Regularization for 112Gbps Optical Interconnects
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Chun-Yen Chuang, Govind Sharan Yadav, Kai-Ming Feng, Jyehong Chen, and Young-Kai Chen
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Transmission (telecommunications) ,Artificial neural network ,Computer science ,Bit error rate ,Overfitting ,Nonlinear equalizer ,Algorithm - Abstract
We propose an L1-regularized multilayer neural network nonlinear equalizer (L1PML-NLE) for inter-data-center interconnects. Compared with conventional and sparse VNLE, the L1PML-NLE reduces 81% and 57.8% complexity with improved BER performance for 40-km 112-Gb/s PAM4 transmission.
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- 2021
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13. Reducing computation complexity by using elastic net regularization based pruned Volterra equalization in a 80 Gbps PAM-4 signal for inter-data center interconnects
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Chun-Yen Chuang, Kai-Ming Feng, Jhih-Heng Yan, Young Kai Chen, Jyehong Chen, and Govind Sharan Yadav
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Elastic net regularization ,Signal processing ,business.industry ,Computer science ,Orthogonal frequency-division multiplexing ,Image quality ,Equalization (audio) ,Equalizer ,Image processing ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Signal ,Atomic and Molecular Physics, and Optics ,010309 optics ,Optics ,Transmission (telecommunications) ,0103 physical sciences ,0210 nano-technology ,business ,Algorithm ,Phase modulation - Abstract
Volterra equalization (VE) presents substantial performance enhancement for high-speed optical signals but suffers from high computation complexity which limits its physical implementations. To address these limitations, we propose and experimentally demonstrate an elastic net regularization-based pruned Volterra equalization (ENPVE) to reduce the computation complexity while still maintain system performance. Our proposed scheme prunes redundant weight coefficients with a three-phase configuration. Firstly, we pre-train the VE with an adaptive EN-regularizer to identify significant weights. Next, we prune the insignificant weights away. Finally, we retrain the equalizer by fine-tuning the remaining weight coefficients. Our proposed ENPVE achieves superior performance with reduced computation complexity. Compared with conventional VE and L1 regularization-based Volterra equalizer (L1VE), our approach show a complexity reduction of 97.4% and 20.2%, respectively, for an O-band 80-Gbps PAM4 signal at a received optical power of −4 dBm after 40 km SMF transmission.
- Published
- 2020
14. Reducing the Impact of Nonlinear Distortion in DML-Based OFDM Transmission by Frequency Gap
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Hidenori Taga, Jyehong Chen, Hong-Minh Nguyen, Chun-Yen Chuang, Chia-Chien Wei, and Takehiro Tsuritani
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Computer science ,Orthogonal frequency-division multiplexing ,02 engineering and technology ,Atomic and Molecular Physics, and Optics ,020210 optoelectronics & photonics ,Transmission (telecommunications) ,Modulation ,Nonlinear distortion ,Optical Carrier transmission rates ,Distortion ,0202 electrical engineering, electronic engineering, information engineering ,Chirp ,Electronic engineering ,Phase modulation - Abstract
This paper demonstrates a novel approach to reducing in-band nonlinear distortion in DML-based OFDM transmission by introducing a frequency gap between the optical carrier and signal band. This scheme greatly increases tolerance to nonlinear distortion caused by the interaction between laser chirp and chromatic dispersion. Tuning the frequency gap between 2 to 5 GHz (in accordance with the transmission distance) makes it possible to mitigate a considerable proportion of dispersion-induced nonlinear distortion. Experiment results revealed that the proposed scheme can increase the achievable data rate by up to 136%, compared to conventional OFDM over 300 km of dispersion-uncompensated standard single mode fiber. Following transmission over more than 200 km, the proposed modulation scheme also outperforms conventional OFDM incorporating with a Volterra equalizer by up to 24%. We also conducted optimization of DML bias current and driving voltage. Our results show that operating at high bias and driving voltage can greatly improve data rates following the mitigation of distortion via gapped OFDM.
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- 2018
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15. 2.6 Tbit/s On-Chip Optical Interconnect Supporting Mode-Division-Multiplexing and PAM-4 Signal
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Hon Ki Tsang, Chun-Yen Chuang, Xinru Wu, Chien-Hung Yeh, Chi-Wai Chow, Yung Hsu, Chin-Wei Hsu, Guan-Hong Chen, Yinchieh Lai, Jyehong Chen, and Yuan-Chia Chang
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Physics ,Optical fiber ,Silicon photonics ,business.industry ,Optical interconnect ,Photonic integrated circuit ,020206 networking & telecommunications ,02 engineering and technology ,01 natural sciences ,Multiplexer ,Multiplexing ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,010309 optics ,law ,Wavelength-division multiplexing ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,Terabit ,Electrical and Electronic Engineering ,business - Abstract
In this letter, we combine the use of dense-wavelength-division-multiplexing and mode-division-multiplexing (MDM) with advanced-modulation formats for on-chip optical interconnects. A three-mode MDM multiplexer (MUX) and de-multiplexer (DEMUX) was designed and used. Each wavelength carrier had an aggregate data rate of 192-Gbit/s using 4-level pulse-amplitude-modulation. The mode crosstalk of the MDM MUX/DEMUX was measured to be below −20 dB in the 40-nm wavelength band from 1520 to 1560 nm. Fourteen wavelength channels are multiplexed and successfully transmitted with an aggregate transmission capacity of 2.6 Tbit/s (14 wavelengths $\times$ 3 modes $\times$ 64 Gbit/s) with all channels satisfying the hard-decision forward-error-correction threshold. Numerical analysis of the mode crosstalk is also performed.
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- 2018
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16. Comparison of VSB PAM4 and OOK Signal in an EML-Based 80-km Transmission System
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Jeffrey Lee, Young-Kai Chen, Noriaki Kaneda, Hsing-Yu Chen, and Jyehong Chen
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Physics ,Analog transmission ,Sideband ,business.industry ,Independent sideband ,02 engineering and technology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Amplitude-shift keying ,Electronic, Optical and Magnetic Materials ,010309 optics ,Amplitude modulation ,020210 optoelectronics & photonics ,Optics ,Pulse-amplitude modulation ,0103 physical sciences ,Double-sideband suppressed-carrier transmission ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business ,Compatible sideband transmission - Abstract
A comparison between 51.84-Gb/s vestigial sideband 4-level pulse amplitude modulation (PAM4) and ON–OFF keying (OOK) signals at a transmission distance of 80 km is experimentally demonstrated for the first time. An electro-absorption modulated laser-based intensity-modulation and direct-detection 80-km transmission is achieved using both modulation formats without dispersion compensating fiber. The relative frequency between single sideband filter and signal is adjusted to find an optimized condition for both carrier to signal power ratio and sideband suppression ratio. The experimental results show that with linear equalization and without bandwidth limitation, the OOK signal has a 4-dB better sensitivity compared with PAM4 after 80-km standard single-mode fiber transmission.
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- 2017
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17. Reduction in Complexity of Volterra Filter by Employing ℓ0-Regularization in 112-Gbps PAM-4 VCSEL Optical Interconnect
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Jyehong Chen, Jin-Wei Shi, Yi-Yu Lin, Chia-Chien Wei, Chun-Jui Chen, Hong-Minh Nguyen, and Chun-Yen Chuang
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010309 optics ,Signal processing ,020210 optoelectronics & photonics ,Computer science ,0103 physical sciences ,Optical interconnect ,0202 electrical engineering, electronic engineering, information engineering ,02 engineering and technology ,Volterra filters ,01 natural sciences ,Regularization (mathematics) ,Algorithm ,Vertical-cavity surface-emitting laser - Abstract
We employ ℓ0-regularization to reduce Volterra filter complexity by up to 90% in 112-Gbps PAM-4 VCSEL transmission. Compared to ℓ1-regularization, ℓ0-regularization achieves lower complexity and more precise weights without retraining after sparse identification.
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- 2020
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18. PNP-Type Optical Phase-Shifter with Low Power Consumption and Fast Switching Time on Silicon Photonics Foundry Platform
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Rui-Lin Chao, Jyehong Chen, Jin-Wei Shi, and Zohauddin Ahmad
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Silicon photonics ,Materials science ,020205 medical informatics ,Power consumption ,business.industry ,Bipolar junction transistor ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,02 engineering and technology ,Foundry ,business ,Fast switching ,Phase shift module - Abstract
We demonstrate a novel PNP bipolar junction transistor based optical phase-shifter on Si-photonic foundry platform. It exhibits a small static power consumption for π phase-shift (P π : 3mW), small driving-voltages (V π :0.1 V), fast switching time (rise/fall
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- 2019
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19. High-Speed Electro-Absorption Modulated Laser at 1.3 μm Wavelength Based on Selective Area Growth Technique
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Chia-Chien Wei, Rui-Lin Chao, Yung-Jr Hung, Jin-Wei Shi, Zohauddin Ahmad, and Jyehong Chen
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Wavelength ,Distributed feedback laser ,Materials science ,Extinction ratio ,business.industry ,law ,Bandwidth (signal processing) ,Optoelectronics ,business ,Laser ,law.invention - Abstract
We demonstrate In x Al y Ga 1-x-y As based electro-absorption modulated DFB laser at 1.3 μm wavelength based on selective area growth technique. The fabricated device exhibits 5 mW output power, wide E-O bandwidth (>40 GHz), 2V driving-voltage for 10 dB extinction ratio, and clear eye-opening at 32Gbit/sec.
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- 2019
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20. Implementing Deep Neural Network for Signal Transmission Distortion Mitigation of PAM-4 Generated by Silicon Mach-Zehnder Modulator
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Young-Kai Chen, Chi-Wai Chow, Chien-Hung Yeh, Hon Ki Tsang, Yung Hsu, Yeyu Tong, Yinchieh Lai, Jyehong Chen, and Chun-Yen Chuang
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Physics ,Silicon photonics ,Artificial neural network ,Transmission (telecommunications) ,Silicon ,chemistry ,Distortion ,Electronic engineering ,Electro-optic modulator ,chemistry.chemical_element ,Signal - Abstract
We propose and demonstrate a distortion mitigation of 50-Gbitls PAM-4 signal generated by a silicon-based Mach-Zehnder-modulator (SiMZM) after 20-km single-mode-fiber transmission via deep-neural-network (DNN). The implementation of a 2-layer DNN is discussed.
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- 2019
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21. Computation efficient sparse DNN nonlinear equalization for IM/DD 112 Gbps PAM4 inter-data center optical interconnects
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Young Kai Chen, Govind Sharan Yadav, Kai-Ming Feng, Chun-Yen Chuang, and Jyehong Chen
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Optical amplifier ,Computational complexity theory ,Artificial neural network ,business.industry ,Computer science ,Optical power ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,Nonlinear system ,Optics ,Transmission (telecommunications) ,Optical transfer function ,0103 physical sciences ,Pruning (decision trees) ,0210 nano-technology ,business ,Algorithm - Abstract
In this Letter, we propose and experimentally demonstrate a novel, to the best of our knowledge, sparse deep neural network-based nonlinear equalizer (SDNN-NLE). By identifying only the significant weight coefficients, our approach remarkably reduces the computational complexity, while still upholding the desired transmission accuracy. The insignificant weights are pruned in two phases: identifying the significance of each weight by pre-training the fully connected DNN-NLE with an adaptive L2-regularization and then pruning those insignificant ones away with a pre-defined sparsity. An experimental demonstration is conducted on a 112 Gbps PAM4 link over 40 km standard single-mode fiber with a 25 GHz externally modulated laser in O-band. Our experimental results illustrate that, for the 112 Gbps PAM4 signal at a received optical power of − 5 d B m over 40 km, the proposed SDNN-NLE exhibits promising solutions to effectively mitigate nonlinear distortions and outperforms a conventional fully connected Volterra equalizer (VE), conventional fully connected DNN-NLE, and sparse VE by providing 71%, 63%, and 41% complexity reduction, respectively, without degrading the system performance.
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- 2021
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22. High-Capacity Carrierless Amplitude and Phase Modulation for WDM Long-Reach PON Featuring High Loss Budget
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Chia-Chien Wei, Wan-Jou Huang, Che-Yu Lin, Jyehong Chen, Li-Wei Chen, and Kuan-Zhou Chen
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Engineering ,Optical power budget ,business.industry ,Amplifier ,Electrical engineering ,02 engineering and technology ,Transmission system ,Passive optical network ,Atomic and Molecular Physics, and Optics ,020210 optoelectronics & photonics ,Transmission (telecommunications) ,Modulation ,Wavelength-division multiplexing ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,business ,Phase modulation - Abstract
This paper utilizes spectrally efficient carrierless amplitude and phase (CAP) modulation and four wavelength division multiplexing channels in formulation of a high-capacity transmission system. The dispersion and loss associated with a single-mode fiber of 60 km can result in severe power fading and insufficient loss budget, respectively. This study employed high launch power to overcome these issues and thereby achieve long-reach transmission without the need for dispersion compensation or an optical inline amplifier. Modified Volterra filtering is used to deal with the linear and nonlinear distortions within the system. This allowed for the inclusion of cost-effective 10-GHz-class electro-absorption modulators and p-i-n detectors for 4- $\lambda$ 224-Gb/s 32-CAP 60-km transmission with a loss budget of 26 dB/channel. The proposed system provides support for the 64 optical network units (ONUs) with downstream transmission of $>$ 3 Gb/s/ONU for future long-reach passive optical networks. We also examined the transmission performance of each channel under various launch powers. Increasing launch power from 9 to 18 dBm/channel increases the loss budget by 9 dB and expands the total capacity by 42%.
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- 2017
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23. 850-nm VCSELs With p-Type $\mathrm {{\delta }}$ -Doping in the Active Layers for Improved High-Speed and High-Temperature Performance
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Jason Jyehong Chen, Xin-Nan Chen, Jia-Liang Yen, Jin-Wei Shi, Kai-Lun Chi, Dan-Hua Hsieh, Ying-Jay Yang, and Hao-Chung Kuo
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Materials science ,Maximum power principle ,business.industry ,Doping ,Bandwidth (signal processing) ,02 engineering and technology ,Condensed Matter Physics ,Lambda ,Atomic and Molecular Physics, and Optics ,Vertical-cavity surface-emitting laser ,Semiconductor laser theory ,020210 optoelectronics & photonics ,Electricity generation ,Optics ,Operating temperature ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,Electrical and Electronic Engineering ,business - Abstract
In this paper, we study the influence of p-type modulation doping on the dynamic/static performance of high-speed 850-nm VCSELs with highly strained multiple quantum wells. The studied device structure has a 3/ $2~\lambda $ asymmetric cavity design, which can let the internal transit time of injected carriers be as short as that of 1/ $2~\lambda $ cavity design and further improve its performance in terms of speed and output power for high single-mode operation. Our proposed VCSEL structure with p-type doping shows superior modulation speed with an output power comparable with that of the un-doped reference device under room temperature operation. Furthermore, when the operating temperature reaches 85 °C, there is a significant improvement in both the modulation speed and maximum power of the p-doped structures. According to our simulation, this can be attributed to the change in the quasi-Fermi levels of the injected carriers after the addition of p-doping in the active layers, which minimizes the electron leakage under high-temperature operation.
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- 2016
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24. Single-Mode 850-nm VCSELs for 54-Gb/s ON–OFF Keying Transmission Over 1-km Multi-Mode Fiber
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Jin-Wei Shi, Kai-Lun Chi, N. N. Ledentsov, J.-R. Kropp, Xin-Nan Chen, Jason Jyehong Chen, M. Agustin, Nikolay Ledentsov, Yi-Xuan Shi, Grzegorz Stepniak, Ying-Jay Yang, and Jaroslaw P. Turkiewicz
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Physics ,Multi-mode optical fiber ,business.industry ,On-off keying ,Single-mode optical fiber ,Optical power ,02 engineering and technology ,Omega ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Semiconductor laser theory ,Vertical-cavity surface-emitting laser ,020210 optoelectronics & photonics ,Optics ,0202 electrical engineering, electronic engineering, information engineering ,Modal dispersion ,Electrical and Electronic Engineering ,Atomic physics ,business - Abstract
By combing Zn-diffusion and oxide-relief apertures with strong detuning (>20 nm) in our demonstrated short-cavity ( $\lambda $ /2) 850-nm vertical-cavity surface-emitting lasers (VCSELs), wide electrical-to-optical bandwidth (29–24 GHz), low-differential resistance ( $\sim 100~\Omega )$ , and (quasi) single-mode (SM) with reasonable output power ( $\sim 1.4$ mW) performances can be simultaneously achieved. Error-free ON–OFF keying transmission at 54-Gb/s data rate through 1-km OM4 multi-mode fiber can be achieved by using highly SM device with forward error correction and decision feedback equalization techniques. As compared with the reference device with a larger oxide-relief aperture and a multi-mode performance, the SM device exhibits lower bit-error rate ( $1\times {10}^{-5} $ versus $1\times {10}^{-2})$ at 54 Gb/s. This result indicates that modal dispersion plays more important role in transmission than that of output power does. We benchmark these results to an industrial 50-Gb/s SM VCSEL. It shows a higher bit-error-rate value $\sim 3.5\times {10}^{-3}$ versus $\sim 1.4\times {10}^{-4}$ under the same received optical power.
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- 2016
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25. Sparse Volterra Nonlinear Equalizer by Employing Pruning Algorithm for High-Speed PAM-4 850-nm VCSEL Optical Interconnect
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Cheng-Yu Huang, Young-Kai Chen, Ching-Ju Ho, Jyehong Chen, Lindor Henrickson, Wei-Fan Chang, Jin-Wei Shi, Chia-Chien Wei, and Chun-Yen Chuang
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Signal processing ,Computer science ,Optical interconnect ,Equalizer ,02 engineering and technology ,Nonlinear equalizer ,01 natural sciences ,Vertical-cavity surface-emitting laser ,010309 optics ,020210 optoelectronics & photonics ,Lasso (statistics) ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Bit error rate ,Pruning algorithm ,Algorithm - Abstract
A pruned Volterra equalizer that reduces computational complexity by up to 85.2% in 112-Gbps PAM-4 optical interconnects is proposed. The BER performance is competitive with LASSO-based Volterra equalizers, and training time is twice as fast.
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- 2019
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26. Development of 400 Gb/s optical transceivers for SMF based datacenter optical interconnect
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Chien-Chung Lin, Zhong Jie Zhang, Shen-Iuan Liu, Tomas Pankra, Chang-Fa Yang, Kuan-Lin Fu, Hen-Wai Tsao, Chun-Liang Yang, Shih-Hsiang Hsu, Lung Wei Chung, San-Liang Lee, and Jyehong Chen
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Signal processing ,Silicon photonics ,Computer science ,Wavelength-division multiplexing ,Optical interconnect ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Hardware_INTEGRATEDCIRCUITS ,Key (cryptography) ,Electronic engineering ,Transceiver ,Multiplexer ,Electronic circuit - Abstract
We reported the progress of developing 400-Gb/s optical transceivers with 1.3-μm electro-absorption modulators for optical interconnect applications in data centers. The key technologies include high-speed light sources, silicon photonics based WDM multiplexers/de-multiplexers, driving and receiving circuits, signal processing and monitoring schemes.
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- 2018
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27. Very High Bit-Rate Distance Product Using High-Power Single-Mode 850-nm VCSEL With Discrete Multitone Modulation Formats Through OM4 Multimode Fiber
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Chia-Chien Wei, Kuan-Zhou Chen, I-Cheng Lu, Wei Lin, Jin-Wei Shi, Jyehong Chen, Cheng-Hsiang Huang, Shi-Wei Chiu, Hsing-Yu Chen, Hao-Chung Kuo, Kai-Lun Chi, Fan-I Lai, and Dan-Hua Hsieh
- Subjects
Physics ,Multi-mode optical fiber ,Optical fiber ,Orthogonal frequency-division multiplexing ,business.industry ,Bandwidth (signal processing) ,Single-mode optical fiber ,Atomic and Molecular Physics, and Optics ,Semiconductor laser theory ,law.invention ,Vertical-cavity surface-emitting laser ,Optics ,law ,Spectral width ,Electrical and Electronic Engineering ,business - Abstract
In order to investigate the tradeoff between optical spectral width and modulation speed of 850-nm Zn-diffusion vertical-cavity surface-emitting laser (VCSEL) and its influence on the performance of discrete multitone (DMT) modulation, two kinds of high-speed VCSEL structures with different cavity lengths (λ/2 and 3λ/2) are studied. By shortening the cavity length to λ/2, allocating the oxide layer in the standing-wave peak, and performing a Zn-diffusion aperture in our VCSEL structure, stable dual mode in the output optical spectra across the full range of bias currents with good high-speed performance (∼16-GHz bandwidth) can be achieved. Compared with its multimode reference, it shows far less roll-off with regard to the maximum data rate versus transmission distance over OM4 multimode fibers under forward error correction (FEC) threshold (BER $ ). On the other hand, for the 3λ/2 VCSEL structure, by using the same Zn-diffusion conditions as those of dual-mode counterpart, highly single-mode operation (side-mode suppression ratio> 35 dB) with high available power can be achieved over the full range of bias currents. Although such device shows a smaller 3-dB electrical-to-optical bandwidth (12 versus 16 GHz) than that of the dual-mode one, it exhibits a superior transmission performance by use of DMT modulation format. A record high bit-rate distance product (107.6 Gb/s·km) at nearly 50-Gb/s transmission under FEC threshold (BER $ ) through 2.2-km OM4 fibers has been successfully demonstrated by the use of single-mode VCSEL with optimized structures. In addition, error-free (BER $ ) transmission at 20.3 Gb/s with bit-rate distance product of 44.66 Gb/s·km has also been demonstrated.
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- 2015
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28. Analysis of Nonlinear Distortion and SSII Cancellation in EAM-Based IMDD OFDM Transmission
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Yu-Chao Chen, Hsuan-Lin Cheng, I-Cheng Lu, Hsuan-Hao Chu, Kuo-Chun Chang, Chia-Chien Wei, Hsing-Yu Chen, and Jyehong Chen
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Nonlinear system ,Correlation coefficient ,Nonlinear distortion ,Orthogonal frequency-division multiplexing ,Linear regression ,Electronic engineering ,Chirp ,Algorithm ,Phase modulation ,Atomic and Molecular Physics, and Optics ,Quadrature amplitude modulation ,Mathematics - Abstract
In terms of second-order nonlinearity, nonlinear distortion in an EAM-based IMDD OFDM system is deterministically modeled as subcarrier-to-subcarrier intermixing interference (SSII), such that DSP-based nonlinear compensation can be provided by decision-aided SSII cancellation at the receiver. The effectiveness of SSII cancellation heavily relies on the accuracy of SSII calculation, which is determined mainly by the modulation model adopted. This study made comprehensive comparisons of three small-signal models (constant-chirp, dynamic-chirp, and nonlinear-E/O models). We then combined theory and experiment results to examine the characteristics of SSII estimation and cancellation using various models, such as SSII spectra, regression coefficients, and correlation coefficients between the SSII and the total received errors, as well as the relationship between improvements in performance and the correlation coefficient. The nonlinear-E/O model is the most comprehensive, and as a result presents the flattest regression coefficient and highest correlation coefficient, which results in the most pronounced improvement in performance.
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- 2015
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29. Optimization of mode numbers of VCSELs for small-cell backhaul applications
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Dar Zu Hsu, I. Cheng Lu, Jhih Min Wun, Hsing-Yu Chen, Jin-Wei Shi, Sheng Fan Tsai, Jyehong Chen, Zhi Rui Wei, and Chia-Chien Wei
- Subjects
Multi-mode optical fiber ,Materials science ,Orthogonal frequency-division multiplexing ,business.industry ,Laser ,Multiplexing ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Vertical-cavity surface-emitting laser ,law.invention ,Backhaul (telecommunications) ,Optics ,law ,Oxide aperture ,Bit error rate ,Optoelectronics ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,business ,Telecommunications - Abstract
This paper reports optical orthogonal frequency-division multiplexing (OFDM) transmission using 850 nm Zn-diffusion Vertical-Cavity Surface-Emitting Lasers (VCSELs) and multimode fiber (MMF) for small-cell backhaul applications. We also investigated the influence of side mode suppression ratio (SMSR) on the performance of OFDM modulation. By further optimizing the Zn-diffusion conditions and oxide aperture size, a high-power (6.7 mW) SM (SMSR>30 dB) VCSEL is demonstrated. By using OFDM modulation and bit-loading algorithm, record-high BRDP (91 Gb/s km) at 26 Gb/s transmission under FEC threshold (bit error rate (BER)
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- 2015
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30. OPMDC: Architecture Design and Implementation of a New Optical Pyramid Data Center Network
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Tzu-Kai Hsu, Jyehong Chen, Joshua Zhu, Yohann Chen, Po-Lung Tien, Wei-Zhang Ruan, Maria C. Yuang, Shan Zhong, and Hsing-Yu Chen
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Engineering ,Optical Transport Network ,business.industry ,Network packet ,Optical cross-connect ,Pyramid ,Throughput ,Optical performance monitoring ,Latency (engineering) ,business ,Optical burst switching ,Atomic and Molecular Physics, and Optics ,Computer network - Abstract
In this paper, we propose a novel optical pyramid data center network architecture (OPMDC), achieving scalable and high bandwidth, low latency, and reduced power consumption and wiring complexity. Based on an incremental and modular design, a full-scale OPMDC is built on three types of WSS-based optical switching nodes in three tiers. These optical nodes are recursively interconnected according to a pyramid structure parameterized by the number of nodes ( B ) at the base. Such a pyramid-based topology facilitates horizontal mesh connections that are tailored to achieve flexible optical packet-based transport. To this aim, we design a wavelength scheduling algorithm, called most-contentious-first, augmented with source and destination relay and aggregation (SDRA) via the horizontal mesh connections in the source and destination pods. Simulation results show that employing SDRA results in a vast improvement of throughput from 42.5% to 87.9% at full load, at a cost of no more than two additional hops of latency. Further, we present our OPMDC ( $B = 7$ ) prototype and provide performance assessment and the measurements of packet latency. Finally, experimental results show that after travelling the longest possible path with six optical nodes in OPMDC, the signal suffers no accumulated distortion and noise from the cascades of WSS and EDFA modules.
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- 2015
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31. 512-Gbit/s PAM-4 Signals Direct-Detection using Silicon Photonics Receiver with Volterra Equalization
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Chi-Wai Chow, Hon Ki Tsang, Chien-Hung Yeh, Liang-Yu Wei, Yung Hsu, Jyehong Chen, Chun-Yen Chuang, and Xinru Wu
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Ethernet ,Signal processing ,Silicon photonics ,Optical fiber ,Computer science ,Equalization (audio) ,02 engineering and technology ,01 natural sciences ,law.invention ,010309 optics ,020210 optoelectronics & photonics ,Signal-to-noise ratio ,Transmission (telecommunications) ,law ,Gigabit ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering - Abstract
A 400-Gbit/s Ethernet (GbE) pulse-amplitude-modulation-4 (PAM-4) over 10-km single-mode-fiber (SMF) transmission direct-detected by an integrated silicon-photonics-receiver satisfying the IEEE P802.3bs requirement; and its feasibility to support 512-Gbit/s were illustrated.
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- 2018
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32. 192-Gbit/s PAM-4 Optical Interconnect using Mode-Division Multiplexing
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Chi-Wai Chow, Chun-Yen Chuang, Hon Ki Tsang, Chien-Hung Yeh, Xinru Wu, Yung Hsu, and Jyehong Chen
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Physics ,business.industry ,Optical interconnect ,Data_CODINGANDINFORMATIONTHEORY ,02 engineering and technology ,Multiplexing ,Mode division multiplexing ,Crosstalk ,020210 optoelectronics & photonics ,Gigabit ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,Hardware_ARITHMETICANDLOGICSTRUCTURES ,business - Abstract
192-Gbit/s pulse-amplitude-modulation-4 (PAM-4) signal transmission for on-chip optical interconnects using mode-division-multiplexing (MDM) is experimentally investigated. 3 channels are successfully mode multiplexed and de-multiplexed satisfying the forward-error correction (FEC) requirement.
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- 2018
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33. 93% Complexity Reduction of Volterra Nonlinear Equalizer by ℓ1-Regularization for 112-Gbps PAM-4 850-nm VCSEL Optical Interconnect
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Jyehong Chen, Wan-Jou Huang, Wei-Fan Chang, Jun-Jie Liu, Kai-Lun Chi, Yi-Ching Chen, Chih-Lin Wang, Jin-Wei Shi, and Chia-Chien Wei
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Signal processing ,020210 optoelectronics & photonics ,Computer science ,Optical interconnect ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,020206 networking & telecommunications ,02 engineering and technology ,Nonlinear equalizer ,Regularization (mathematics) ,Vertical-cavity surface-emitting laser - Abstract
We successfully transmit a 112-Gbps PAM-4 signal over 200-m OM4 fiber using 850-nm VCSEL and Volterra filter. Adopting l 1 -regularization can reduce 93% of computation complexity of Volterra filter at the KP4 FEC limit.
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- 2018
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34. Convolutional Neural Network based Nonlinear Classifier for 112-Gbps High Speed Optical Link
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Chia-Chien Wei, Lindor Henrickson, Young-Kai Chen, Jyehong Chen, Chun-Yen Chuang, Chih-Lin Wang, Jun-Jie Liu, Wan-Jou Huang, and Li-Chun Liu
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Signal processing ,Nonlinear classifier ,Artificial neural network ,Computer science ,Optical link ,020207 software engineering ,02 engineering and technology ,Convolutional neural network ,Nonlinear system ,020210 optoelectronics & photonics ,Transmission (telecommunications) ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Bit error rate - Abstract
We have designed a novel convolutional neural network based nonlinear classifier that outperforms traditional Volterra nonlinear equalizers. A BER of 3.50 × 10-6 is obtained for a 112-Gbps PAM4 EML-based optical link over 40-km SMF transmission.
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- 2018
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35. Employing Deep Neural Network for High Speed 4-PAM Optical Interconnect
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Kai-Lun Chi, Jyehong Chen, Li-Chun Liu, Chun-Yen Chuang, Jin-Wei Shi, Tien-Chien Lin, Chia-Chien Wei, and Young-Kai Chen
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020210 optoelectronics & photonics ,Artificial neural network ,Computer science ,Product (mathematics) ,Optical interconnect ,0202 electrical engineering, electronic engineering, information engineering ,Bandwidth (computing) ,Electronic engineering ,02 engineering and technology ,Vertical-cavity surface-emitting laser ,Data modeling - Abstract
We implement a deep neural network (DNN) to attain a 64-Gbps 4-PAM, 4-km MMF link by using 850-nm VCSEL, with BER of 4.41 ×10−5. The data-rate-distance product achieves recorded high of 256-Gbps-km for Inter-data center applications.
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- 2017
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36. 67.6% Improvement in data rate employing partial transmit sequence for PAPR reduction and volterra filtering in an OFDM long-reach PON
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Jyehong Chen, Chia-Wei Hsu, Young-Kai Chen, Jun-Jie Liu, Chun-Yen Chuang, Chia-Chien Wei, and Hong-Minh Nguyen
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Reduction (complexity) ,Sequence ,020210 optoelectronics & photonics ,Computer science ,Orthogonal frequency-division multiplexing ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Optical communication ,02 engineering and technology ,Nonlinear equalizer ,Data rate - Abstract
We applied partial transmit sequence and Volterra filtering to achieve 67.6% improvement in capacity in a high-launch-power 60-km OFDM LR-PON. 61-Gbps capacity and 30-dB loss budget were realized to support 64 ONUs with 0.95 Gbps/ONU.
- Published
- 2017
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37. 56-Gbps 4-PAM system over nearly 40 km transmission by employing an O-band EML and SOA
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Jyehong Chen, Alan Hong, Chia-Chien Wei, Bobby Shie, Young-Kai Chen, Hong-Minh Nguyen, Chun-Yen Chuang, and Jun-Jie Liu
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Materials science ,business.industry ,Optical communication ,02 engineering and technology ,Transmission system ,021001 nanoscience & nanotechnology ,01 natural sciences ,Power budget ,010309 optics ,Optical fiber amplifiers ,Transmission (telecommunications) ,0103 physical sciences ,Optoelectronics ,0210 nano-technology ,business ,Sensitivity (electronics) - Abstract
This work demonstrates a 56-Gbps 4-PAM EML-based transmission system. Using an O-band SOA to increase power budget and FFE/DFE to compensate SOA-induced ISI, 37.8-km transmission is successfully implemented with BER below the FEC limit (2 × 10−4)
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- 2017
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38. Frequency- and time-domain nonlinear distortion compensation in high-speed OFDM-IMDD LR-PON with high loss budget
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Che-Yu Lin, Chia-Chien Wei, Li-Wei Chen, Hsing-Yu Chen, I-Cheng Lu, and Jyehong Chen
- Subjects
business.industry ,Computer science ,Orthogonal frequency-division multiplexing ,Amplifier ,02 engineering and technology ,Filter (signal processing) ,Atomic and Molecular Physics, and Optics ,020210 optoelectronics & photonics ,Optics ,Transmission (telecommunications) ,Nonlinear distortion ,Frequency domain ,Dispersion (optics) ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Waveform ,Fading ,Time domain ,business ,Self-phase modulation ,Phase modulation ,Linear filter - Abstract
This study compared two nonlinear distortion compensation techniques, SSII cancellation (in the frequency domain) and Volterra filtering (in the time domain), in a >50-Gbps/λ OFDM-IMDD LR-PON. Experiment results for SNR, BER, and data rate (based on a bit-loading algorithm) revealed that the performance of frequency-domain SSII cancellation is unaffected by power fading; however, it depends heavily on the precision of the mathematical model. Conversely, although time-domain Volterra filtering is affected by the faded waveform, adaptive-weighting provides flexibility in dealing with mixed nonlinear distortion, particularly that associated with the interplay between fiber dispersion and fiber nonlinearity. 4-channel WDM-OFDM and 3rd-order Volterra filtering were used to demonstrate the feasibility of the proposed scheme in a 200-Gbps IMDD system. Based on 10-GHz EAM and PIN, we achieved 200-Gbps transmission over a distance of 60 km with a loss budget of >30 dB, while providing support for 128 ONUs at >1.6 Gbps/ONU without the need for an inline amplifier or pre-amplifier.
- Published
- 2017
39. 400-Gb/s Transmission Over 10-km SSMF Using Discrete Multitone and 1.3-$\mu $ m EMLs
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Trevor Chan, Winston I. Way, Jyehong Chen, and I. Cheng Lu
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Optical amplifier ,Materials science ,business.industry ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Semiconductor ,Transmission (telecommunications) ,law ,Margin (machine learning) ,Electronic engineering ,Optoelectronics ,Electrical and Electronic Engineering ,business - Abstract
We experimentally demonstrated 400-Gb/s transmission over 10-km standard single-mode using discrete multi-tone (DMT) and four 1.3-µm local-area-network wavelength-division-multiplexed externally modulated lasers. A reasonably good system margin has been obtained. We have also investigated the fundamental limitations of using semiconductor optical amplifiers for DMT-based systems.
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- 2014
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40. Performance analysis of free space optical communication traffic integrated with passive optical network
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Chi-Wai Chow, Chien-Hung Yeh, Jyehong Chen, Y. J. Cheng, B. S. Guo, and C. S. Gu
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Optical fiber ,business.industry ,Computer science ,Electrical engineering ,020206 networking & telecommunications ,Keying ,02 engineering and technology ,01 natural sciences ,Passive optical network ,Amplitude-shift keying ,law.invention ,010309 optics ,Transmission (telecommunications) ,law ,Gigabit ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Optical wireless ,Electrical and Electronic Engineering ,business ,Free-space optical communication - Abstract
In this Letter, a hybrid 10 Gbit/s on–off keying free space optics and passive optical network (FSO-PON) system is proposed and demonstrated. The experimental received sensitivities are −18 and −20 dBm at the back to back (BtB) and after 25 km fibre transmission, respectively, with 5 m free space traffic link. In the proposed analysis, FSO-PON system can support 32 and 16; and 8 and 4 remote optical wireless units for free space communication at BtB and after 25 km fibre link, respectively, when the free space transmission lengths are 150 and 300 m.
- Published
- 2018
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- View/download PDF
41. An Energy and Cost Efficient WDM/OFDMA PON System: Design and Demonstration
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Chia-Chien Wei, Dar-Zu Hsu, Jyehong Chen, Maria C. Yuang, Shin-Hao Chen, Hsing-Yu Chen, and Po-Lung Tien
- Subjects
Engineering ,Bandwidth allocation ,Channel allocation schemes ,business.industry ,Orthogonal frequency-division multiplexing ,Orthogonal frequency-division multiple access ,Wavelength-division multiplexing ,Bandwidth (signal processing) ,Electronic engineering ,business ,Passive optical network ,Atomic and Molecular Physics, and Optics ,Efficient energy use - Abstract
In this paper, we propose an energy and cost efficient WDM/OFDMA PON system, referred to as NEWOPS. Based on a new two-tiered semi-tree architecture, NEWOPS allows a large number of ONUs to be connected to OLT using only a handful of colorless transceivers. Due to the architecture, NEWOPS not only facilitates high spectral efficiency and flexible sub-channel bandwidth allocation, but also reduces the Rayleigh backscattering (RB) problem and achieves high energy and cost efficiency. Experimental results demonstrate that, taking only 5-GHz bandwidth for each wavelength, NEWOPS successfully achieves 20-Gb/s downstream and 10-Gb/s upstream OFDM-xQAM transmissions via the same fiber trunk. We depict that, to support 40 ONUs for example, NEWOPS achieves energy efficiency that is three to six times higher than that of a typical 10-Gb/s WDM/OFDM PON.
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- 2013
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42. Using a L-Band Weak-Resonant-Cavity FPLD for Subcarrier Amplitude Pre-Leveled 16-QAM-OFDM Transmission at 20 Gbit/s
- Author
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Jyehong Chen, Yu-Chieh Chi, Gong-Ru Lin, and Yi-Cheng Li
- Subjects
Physics ,Injection locking ,Orthogonal frequency-division multiplexing ,Transmitter ,Bandwidth (signal processing) ,Bit error rate ,Electronic engineering ,Atomic and Molecular Physics, and Optics ,Subcarrier ,Quadrature amplitude modulation ,Data transmission - Abstract
A directly modulated and coherently injection-locked WRC-FPLD transmitter is preliminarily employed to perform the 16-QAM-OFDM data transmission by using an OFDM subcarrier amplitude pre-leveling technique. The maximum transmission bit-rate of 20-Gbit/s is reported by fusing the OFDM subcarrier pre-leveling with the coherent injection-locking techniques in such a directly modulated WRC-FPLD. Without pre-leveling the OFDM subcarrier, the coherently injection-locked L-band WRC-FPLD suppresses its mode-partition noise to improve the EVM of the 16-QAM-OFDM data only from 13.52% to 10.2%. The OFDM subcarrier pre-leveling effectively compensate the finite bandwidth and unflattened modulating response of the injection-locked WRC-FPLD to improve the transmission EVM and SNR performances. The received constellation plot reveals that the EVM and SNR of the back-to-back transmitted 16-QAM-OFDM data are significantly improved to 5.58% and 17 dB, respectively. With the use of both injection-locking and pre-leveling techniques, the directly 16-QAM-OFDM modulated WRC-FPLD transmitter can reach the FEC limited BER of 3.8 × 10-3 at a receiving power sensitivity of -10 dBm. The OFDM subcarrier pre-leveling technique helps the WRC-FPLD to reduce the overall BER of 16-QAM-OFDM data by one order of magnitude, providing a minimum BER of 4.5 × 10-5 at a receiving power of -2 dBm.
- Published
- 2013
- Full Text
- View/download PDF
43. Single-mode 850-nm vertical-cavity surface-emitting lasers with Zn-diffusion and oxide-relief apertures for > 50 Gbit/sec OOK and 4-PAM transmission
- Author
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Jin-Wei Shi, Ying-Jay Yang, Jyehong Chen, Chia-Chien Wei, and N. N. Ledentsov
- Subjects
Materials science ,business.industry ,020208 electrical & electronic engineering ,Optical interconnect ,Single-mode optical fiber ,Optical communication ,Linearity ,Optical power ,02 engineering and technology ,Integrated circuit ,Amplitude-shift keying ,Vertical-cavity surface-emitting laser ,law.invention ,020210 optoelectronics & photonics ,Optics ,law ,0202 electrical engineering, electronic engineering, information engineering ,business - Abstract
Vertical-cavity surface-emitting lasers (VCSELs) has become the most important light source in the booming market of short-reach ( 150 Ω) seriously limits the >50 Gbit/sec linking distance ( 50 Gbit/sec transmission due to that it can save one-half of the required bandwidth. Nevertheless, a 4.7 dB optical power penalty and the linearity of transmitter would become issues in the 4-PAM linking performance. Besides, in the modern OI system, the optics transreceiver module must be packaged as close as possible with the integrated circuits (ICs). The heat generated from ICs will become an issue in speed of VSCEL. Here, we review our recent work about 850 nm VCSEL, which has unique Zn-diffusion/oxide-relief apertures and special p- doping active layer with strong wavelength detuning to further enhance its modulation speed and high-temperature (85°C) performances. Single-mode (SM) devices with high-speed (~26 GHz), reasonable resistance (~70 Ω) and moderate output power (~1.5 mW) can be achieved. Error-free 54 Gbit/sec OOK transmission through 1km MMF has been realized by using such SM device with signal processing techniques. Besides, the volterra nonlinear equalizer has been applied in our 4-PAM 64 Gbit/sec transmission through 2-km OM4 MMF, which significantly enhance the linearity of device and outperforms fed forward equalization (FFE) technique. Record high bit-rate distance product of 128⋅km is confirmed for optical-interconnect applications.
- Published
- 2017
- Full Text
- View/download PDF
44. 64-Gbit/s PAM-4 20-km Transmission Using Silicon Micro-ring Modulator for Optical Access Networks
- Author
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Hon Ki Tsang, Tien-Chien Lin, Chi-Wai Chow, Chien-Hung Yeh, Chun-Yen Chuang, Jyehong Chen, Xinru Wu, Yung Hsu, and Ta-Ching Tzu
- Subjects
Access network ,Silicon ,Computer science ,business.industry ,Transmitter ,Electrical engineering ,chemistry.chemical_element ,02 engineering and technology ,020210 optoelectronics & photonics ,Ring modulation ,Transmission (telecommunications) ,chemistry ,Gigabit ,0202 electrical engineering, electronic engineering, information engineering ,business - Abstract
We demonstrate the feasibility of using silicon-micro-ring-modulators for 50-Gbit/s and 64-Gbit/s pulse-amplitude-modulation-4 (PAM-4) communications in a 20-km single-modefiber (SMF) link with Volterra-filtering. The integrated transmitter may be used in passive-optical-access-networks with 20-km-reach and 64-split-ratio.
- Published
- 2017
- Full Text
- View/download PDF
45. A High Loss Budget 400-Gbps WDM-OFDM Long-Reach PON over 60 km Transmission by 10G-class EAM and PIN without In-line or Pre-Amplifier
- Author
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Shao-Yu Lu, Young-Kai Chen, Hong-Minh Nguyen, Jyehong Chen, Hsin-Yu Wu, Chia-Chien Wei, Chun-Wei Wang, Jun-Jie Liu, and Chun-Yen Chuang
- Subjects
Computer science ,Orthogonal frequency-division multiplexing ,Preamplifier ,Cross-phase modulation ,02 engineering and technology ,01 natural sciences ,010309 optics ,020210 optoelectronics & photonics ,Transmission (telecommunications) ,Modulation ,Wavelength-division multiplexing ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Bit error rate ,Electronic engineering ,Phase modulation - Abstract
A 400-Gbps WDM-OFDM LR-PON over 60-km SMF is demonstrated with a 10G-class EAM and PIN. 25-dB loss budget is realized without in-line or pre-amplifier to economically support 128 ONUs with 3.1-Gbps/ONU capacity.
- Published
- 2017
- Full Text
- View/download PDF
46. 6.36 Gbit/s RGB LED-based WDM MIMO Visible Light Communication System Employing OFDM Modulation
- Author
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Jyehong Chen, Chien-Hung Yeh, Chih-Han Lai, and I-Cheng Lu
- Subjects
Computer science ,Orthogonal frequency-division multiplexing ,MIMO ,Fast Fourier transform ,Visible light communication ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,010309 optics ,Modulation ,Gigabit ,Wavelength-division multiplexing ,0103 physical sciences ,Electronic engineering ,Light beam ,RGB color model ,0210 nano-technology - Abstract
An aggregate data rate of 6.36 Gbit/s of RGB 2×2 MIMO VLC system is demonstrated for the proof-of-concept. Moreover, the corresponding VLC rates under the free-space transmissions of 1 to 3 m are also analyzed.
- Published
- 2017
- Full Text
- View/download PDF
47. A High-Performance OFDMA PON System Architecture and Medium Access Control
- Author
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Po-Lung Tien, Maria C. Yuang, Dar-Zu Hsu, Shing-Yu Chen, Jyehong Chen, Ju-Lin Shih, and Chia-Chien Wei
- Subjects
Engineering ,Frequency-division multiple access ,Orthogonal frequency-division multiplexing ,Cost effectiveness ,business.industry ,Orthogonal frequency-division multiple access ,Scalability ,Electronic engineering ,Spectral efficiency ,business ,Multiplexing ,Passive optical network ,Atomic and Molecular Physics, and Optics - Abstract
Orthogonal frequency-division multiplexing (OFDM) passive optical network (PON) has been considered to be a promising next-generation broadband wired access solution. However, based on the current tree-based architecture, existing OFDM PON systems face severe challenges when increasing the scalability and data-rate performance. In this paper, we propose a high-performance virtual-tree orthogonal frequency-division multiple access PON system (VTOPS). With the virtual-tree architecture and coupled with the use of inexpensive direct modulation, VTOPS features high reliability, scalability, spectrum efficiency, and cost effectiveness all at once. For governing the flexible/fair access and dynamic allocation of bandwidth, VTOPS incorporates a rate-based medium access control (MAC) scheme. The MAC scheme performs dynamic rate adjustment using a neural-fuzzy system. By adjusting the system parameters, the MAC scheme can achieve a wide range of delay and fairness performance under a variety of traffic patterns. Finally, we show both theoretical and experimental results to demonstrate that, by applying the power pre-emphasis algorithm and adaptive subchannel modulation, VTOPS achieves 40 Gb/s downlink and 40 Gb/s uplink transmissions, using low-cost 10 GHz directly modulated lasers.
- Published
- 2012
- Full Text
- View/download PDF
48. SOA-based fiber ring laser use in a photonic radio-frequency phase shifter
- Author
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Chun-Ting Lin, Jyehong Chen, Fang-Ming Wu, W. C. Kao, and Peng-Chun Peng
- Subjects
Optical amplifier ,Materials science ,business.industry ,Physics::Optics ,Ring laser ,Laser pumping ,Condensed Matter Physics ,Laser ,Industrial and Manufacturing Engineering ,Atomic and Molecular Physics, and Optics ,Power (physics) ,law.invention ,Optics ,law ,Physics::Atomic Physics ,Radio frequency ,Photonics ,business ,Instrumentation ,Phase shift module - Abstract
This investigation demonstrates the feasibility of a semiconductor optical amplifier (SOA)—based fiber ring laser use in a photonic radio-frequency (RF) phase shifter. Experimental results indicate that a fiber ring laser can successfully replace an external pump laser in a photonic RF phase shifter. The RF phase shifter can be turned by adjusting the power of the fiber ring laser.
- Published
- 2011
- Full Text
- View/download PDF
49. Ultra-High Data-Rate 60 GHz Radio-Over-Fiber Systems Employing Optical Frequency Multiplication and OFDM Formats
- Author
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Sien Chi, Chun-Ting Lin, Po-Tsung Shih, Jyehong Chen, and Wen-Jr Jiang
- Subjects
Radio over fiber ,Transmission (telecommunications) ,business.industry ,Computer science ,Orthogonal frequency-division multiplexing ,Bandwidth (signal processing) ,Electronic engineering ,Wireless ,Radio frequency ,Spectral efficiency ,business ,Atomic and Molecular Physics, and Optics ,Frequency-division multiplexing - Abstract
The increasing demand for wireless video-based interactive and multimedia data services explains why 60-GHz millimeter-wave wireless system is a promising candidate to provide multi-gigabit-per-second wireless services. While attempting to generate and transmit 60 GHz signals in a wireless system cost effectively and increase the spectral efficiency to facilitate multi-gigabit-per-second services, this work reviews three radio-over-fiber (RoF) systems based on optical frequency multiplication (up to 6 times) to reduce the bandwidth requirement of optical transmitters. Additionally, orthogonal frequency division multiplexing (OFDM) signals with multi-level modulation formats (16 QAM) are utilized to achieve an ultrahigh data rate of 28 Gbps within the 7-GHz license-free band and compensate for an uneven frequency response of 60-GHz RoF systems. Negligible power penalty following 25-km standard single mode fiber (SSMF) transmission is observed, capable of significantly extending the service range to various applications within a building or campus.
- Published
- 2010
- Full Text
- View/download PDF
50. 30-Gbps 100-km OFDM Transmission Using 10-GHz DML and Adiabatic-Chirp-Involved SSII Cancellation
- Author
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Hsuan-Lin Cheng, Jyehong Chen, Yi-Hsiang Wang, and Chia-Chien Wei
- Subjects
Physics ,020210 optoelectronics & photonics ,Transmission (telecommunications) ,Orthogonal frequency-division multiplexing ,Modulation ,Nonlinear distortion ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Chirp ,Fading ,02 engineering and technology ,Phase modulation ,Quadrature amplitude modulation - Abstract
We experimentally verified the influences of adiabatic chirp on DML-based OFDM transmission, including fading and nonlinear distortion. Employing the proposed SSII cancellation, the capacity over 100-km transmission was increased by 55% to record-high 30 Gbps.
- Published
- 2016
- Full Text
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