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Your search keyword '"Eiji Yoshida"' showing total 8 results
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8 results on '"Eiji Yoshida"'

1. Compact ROSA for 100-Gb/s (4 × 25 Gb/s) Ethernet with a PLC-based AWG demultiplexer

Author

Manabu Oguma, Tetsuichiro Ohno, I. Ogawa, H. Takahashi, Mikitaka Ito, Eiji Yoshida, Toshihide Yoshimatsu, and Yoshiyuki Doi

Subjects
Physics, Ethernet, Demultiplexer, Transmission (telecommunications), business.industry, Photonic integrated circuit, Electronic engineering, Optoelectronics, Photodetector, Transceiver, business, Sensitivity (electronics), Passband
Abstract

We report a compact receiver optical sub-assembly (ROSA) for 100GbE CFP4 transceivers. All the four channels of fabricated module exhibits wide wavelength passband and high receiver sensitivity enough for 10-km-reach transmission.

Published
2013

3. 100-Gbit/s PDM-QPSK Coherent Receiver with Wide Dynamic Range and Excellent Common-mode Rejection Ratio

Author

Hiroto Kawakami, Ogawa Ikuo, Hiroyuki Fukuyama, Toshihide Yoshimatsu, Hideyuki Nosaka, Eiji Yoshida, Satoshi Tsunashima, Koichi Murata, Yoshifumi Muramoto, Kimikazu Sano, Takashi Saida, Takayuki Mizuno, Ryoichi Kasahara, Hiromasa Tanobe, and Kuninori Hattori

Subjects
Engineering, Signal processing, Radio receiver design, Computer science, business.industry, Dynamic range, Optical performance monitoring, Signal, Atomic and Molecular Physics, and Optics, Optics, Common-mode rejection ratio, Wide dynamic range, Electronic engineering, Heterodyne detection, business, Quadrature amplitude modulation, Phase-shift keying
Abstract

We report the design and fabrication of a hybrid-integration-type coherent receiver. We optimize the receiver building blocks, and achieve a -25-dB common-mode rejection ratio and a 20-dB signal input power dynamic range.

Published
2011

4. Auto Bias Control Technique for Optical 16-QAM Transmitter with Asymmetric Bias Dithering

Author

Yutaka Miyamoto, Eiji Yoshida, Takayuki Kobayashi, and Hiroto Kawakami

Subjects
Optical amplifier, Physics, Quadrature modulation, business.industry, Transmitter, Carrierless amplitude phase modulation, Atomic and Molecular Physics, and Optics, QAM, Amplitude modulation, Optics, Baud, Modulation, Pulse-amplitude modulation, Q factor, Electronic engineering, Dither, business, Quadrature amplitude modulation, Amplitude and phase-shift keying, Phase-shift keying
Abstract

ABC (Auto Bias Control) technique for QAM (Quadrature Amplitude Modulation) transmitter is demonstrated. 16-QAM (10G baud) is generated and controlled using a single IQ modulator and asymmetric bias dithering technique. Measured penalty is 0.3 dB.

Published
2011

5. Spectrum-Narrowing Tolerant Receiver using Maximum-Likelihood Sequence Estimation for PDM-16QAM 1,200-km Transmission

Author

Etsushi Yamazaki, Akihide Sano, Eiji Yoshida, Kengo Horikoshi, Yutaka Miyamoto, Takayuki Kobayashi, and Shogo Yamanaka

Subjects
Adaptive filter, Signal processing, Transmission (telecommunications), Polarization mode dispersion, Electronic engineering, Estimator, Maximum likelihood sequence estimation, Multiplexing, Algorithm, Quadrature amplitude modulation, Mathematics
Abstract

We successfully demoustrate PDM-16-QAM transmission over 1200 km, by using a novel receiver architecture composed of a spectrum-narrowed adaptive-filter and maximum-likelihood sequence estimators. The architecture contributes 300-km of distance extension.

Published
2011

6. Ultra long-haul transmission over 6,000 km of 100 Gb/s serial signal by using coherent detection

Author

Hiroji Masuda, K. Ishihara, Etsushi Yamazaki, Riichi Kudo, Eiichi Yamada, Masato Mizoguchi, Eiji Yoshida, Takayuki Kobayashi, Y. Miyamoto, Akihide Sano, and Yasushi Takatori

Subjects
Optical amplifier, Physics, Signal processing, Optics, Transmission (telecommunications), Polarization mode dispersion, Orthogonal frequency-division multiplexing, business.industry, Heterodyne detection, business, Signal, Communication channel
Abstract

We have demonstrated a 100-Gb/s single channel transmission over the longest distance of 6,000 km ever reported using 2-subcarrier no-guard-interval PDM CO-OFDM. The unique DSP technology enabled to compensate for CD up to 109,200 ps/nm.

Published
2009

7. 1.6 ps PULSE GENERATION FROM A 1.3 µm Pr3+-DOPED FLUORIDE FIBER LASER

Author

T. Sugawa, Y. Miyajima, Eiji Yoshida, and Masataka Nakazawa

Subjects
Optical fiber, Materials science, business.industry, Amplifier, Soliton (optics), Pulse shaping, law.invention, Pulse (physics), Mode-locking, law, Fiber laser, Optoelectronics, business, Ultrashort pulse
Abstract

The nonlinear-optical loop mirror (NOLM) has been widely applied in such areas as ultrashort pulse generation, pulse shaping, and signal processing[1]. The NOLM has been used as an intensity dependent optical mirror in a linear cavity to generate mode-locked pulses passively. The nonlinear amplifying loop mirror (NALM), which includes an amplifier in the loop, is also an interesting optical fiber device which is used for switching low intensity pulses[2]. Recently, striking progress has been achieved in the field of ultrashort pulse generation through the use of NOLM or NALM and in the future they are expected to be used as practical light sources for soliton communication[3,4]. Several reports have been published on ultrashort pulse generation in the 1.5 pm band using NALM[4,5].

Published
1993

8. A New Femtosecond Erbium-Doped Fiber Laser with Nonlinear Polarization Rotation

Author

Tomoki Sugawa, Eiji Yoshida, Masa taka Nakazawa, and Yasuo Kimura

Subjects
Materials science, business.industry, Fiber laser, Femtosecond, Physics::Optics, Pulse wave, Second-harmonic generation, Optoelectronics, Polarization-maintaining optical fiber, Nonlinear polarization, business, Polarization (waves), Erbium doped fiber lasers
Abstract

A continuum suppressed, uniformly repetitive pulse train as short as 136-145 fs has been successfully generated at 1.55 µm from a new type of femtosecond erbium-doped fiber laser with nonlinear polarization rotation.

Published
1993

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