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Your search keyword '"Huang, Chia-Chih"' showing total 23 results
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23 results on '"Huang, Chia-Chih"'

8. L-band automatic-gain-controlled erbium-doped fiber amplifier utilizing C-band backward-amplified spontaneous emission and electrical feedback monitor

Author

Shen, Jyi-Lai, Lee, Yueh-Chien, and Huang, Chia-Chih

Subjects
Erbium -- Properties, Amplifiers (Electronics) -- Properties, Amplifiers (Electronics) -- Usage, Digital multiplexing -- Methods, Multichannel communication -- Methods, Multiplexing -- Methods, Emission spectra -- Research, Feedback loops (Systems theory) -- Research, Signal processing -- Methods, Digital signal processor, Astronomy, Physics
Abstract

A new L-band automatic-gain-controlled (AGC) erbium-doped fiber amplifier (EDFA) for dense wavelength-division-multiplexing transmission systems is presented, in which a single 1480 nm laser with an internal thermoelectric cooler is used as a primary pump for stable amplification. All C-band amplified spontaneous emission (ASE) is recycled by the secondary pump to enhance the gain efficiency. A fraction of the output signal is used as an electrical feedback monitor for the AGC to improve the gain-clamped (GC) flatness. Experimental results prove that the AGC EDFA has a gain flatness of better than 0.46 dB/40 nm, i.e., below 1.5%, and a higher gain of approximately 36.5 dB compared to that of approximately 35.3 dB for the conventional GC EDFA at -30 dBm input signal power. The best gain flatness of [+ or -] 0.25 dB can be achieved over the dynamic range greater than 20 dB. The dynamic range of noise figure is between 6.7 and 7.1. The 3 dB down bandwidth is more than 40nm. Overall dynamics measurements for the AGC EDFA feedback stabilization have been carried out. The recorded corresponding rise time of 1.565 ms indicates that the system does not exhibit any overshoot of gain or ASE variation due to the signal at the beginning of the pulse. OCIS codes: 140.3280, 230.4480, 060.4510.

Published
2009

22. Rapid Synthesis and Characterization of CuInS2 Prepared Using Microwave-Assisted Heating

Author

Tsai, Ming Kwen, Lee, Yueh Chien, Huang, Chia Chih, Hu, Sheng Yao, Tiong, Kwong Kau, and Chen, Bo Jhin

Abstract

In this work, the CuInS2 nanoparticles are successfully synthesized by microwave-assisted heating technique and further calcined at 400 °C. The morphological, structural, and optical properties of the synthesized CuInS2 nanoparticles are investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), Raman scattering, and transmittance measurement, respectively. The SEM image shows the clear particle shape of the calcined CuInS2 nanoparticles. After calcination treatment, the fundamental (112) peak of the XRD spectrum and a broad Raman peak mixed with chalcopyrite and CuAu structures support the improved crystallinity of the calcined CuInS2 nanoparticles.

Published
2015
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23. Luminescence Mechanism of ZnWO4 Nanopowder Synthesized by Microwave-Assisted Heating

Author

Tsai, Ming Kwen, Lee, Yueh Chien, Huang, Chia Chih, Hu, Sheng Yao, Tiong, Kwong Kau, and Hong, Bo Yao

Abstract

The luminescence investigations on the calcinated zinc tungstate nanopowder (ZnWO4 NP) synthesized by microwave-assisted synthesis are presented using photoluminescence (PL) and time-resolved photoluminescence (TRPL) analyses. The X-ray diffraction (XRD) patterns exhibit that the significant wolframite structure of ZnWO4 NP can be detected at calcination temperatures above 300 oC. The 12 K PL and TRPL results demonstrated that the deformation of WO6 octahedra is responsible for the low-energy side of PL spectra and dominate the red-shifted PL spectra with increasing calcination temperatures.

Published
2013
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