Browsing by Author "Hung, Chi-Ming"

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10 Gbit/s all-optical NRZ-to-RZ data format conversion in a dark-optical-comb injected semiconductor optical amplifier
(2006)
Hung, Chi-Ming
;
Yu, Kun-Chieh
;
Chang, Yung-Cheng
;
Lin, Gong-Ru
;
光電工程學系
All-optical 10 Gbit/s NRZ-to-RZ data-format conversion in a backward dark-optical-comb injected semiconductor optical amplifier with BER of 10(-13) at receiving power of -19 dBm and a positive power penalty of 3.7 dB is primarily demonstrated. (C) 2006 Optical Society of America.
Double-pass high-gain low-noise EDFA over Sand C+L-bands by tunable fundamental-mode leakage loss
(2007-02-19)
Hung, Chi-Ming
;
Chen, Nan-Kuang
;
Lai, Yinchieh
;
Sien, Chi
;
光電工程學系
We demonstrate a high-gain low-noise double-pass tunable EDFA over S- and C+L-bands by discretely introducing fundamental-mode leakage loss in a 16-m-long standard C-band Er3+-doped fiber. The amplified spontaneous emission at the wavelengths of longer than 1530 nm can be substantially attenuated by the ASE suppressing filters to maintain high population inversion and to squeeze out the optical gain for S- band signals. When the filters are disabled, the gain bandwidth immediately returns back to the C+L-bands. Under S-band operation, a 37 dB small signal gain and a minimum 4.84 dB noise figure at 1486.9 nm are achieved with a 980 nm pump power of 154 mW. (c) 2007 Optical Society of America.
High-gain low-noise tunable EDFA over S- and C+L-bands with double-pass configuration
(2007)
Hung, Chi-Ming
;
Chen, Nan-Kuang
;
Lai, Yinchieh
;
Chi, Sien
;
光電工程學系
We demonstrate high-gain low-noise double-pass EDFA over S- and C+L-bands using fundamental-mode cutoff filters in a 16-m-long standard C-band Er(3+)-doped fiber. Under S-band operation, a 37 dB small signal gain and a minimum 4.84 dB noise figure at 1486.9 nm are achieved with a 980-nm pump power of 154 mW.
Optimization on cross-gain-modulating power and wavelength for pulsed data-pattern reshaping in optical-clock controlled semiconductor optical amplifier
(2006)
Chang, Yung-Cheng
;
Hung, Chi-Ming
;
Yu, Kun-Chieh
;
Lin, Gong-Ru
;
光電工程學系
Effect of cross-gain-modulating power and wavelength a reshaped-optical-clock injected SOA at 10Gbit/s is investigated to achieve pulsed data-pattern transformation with highest extinction ratio of 13.6dB at input data power of -10dBm under a modulating power of 17.9dBm at 1550nm. (C) 2006 Optical Society of America.
Towards the short-wavelength limit at 1450 nm in a widely tunable erbium-doped fiber laser
(2007)
Hung, Chi-Ming
;
Chen, Nan-Kuang
;
Lai, Yinchieh
;
Chi, Sien
;
光電工程學系
We demonstrate a widely tunable fiber ring laser over 1451.9 similar to 1548.1 nm with temperature tuning efficiency as high as 57.3 nm/degrees C by using a 16-m-long standard silica-based erbium-doped fiber under 980-nm pump power of 208 mW. (C)2007 Optical Society of America
Towards the short-wavelength limit lasing at 1450 nm over I-4(13/2)-> I-4(15/2) transition in silica-based erbium-doped fiber
(2007-12-10)
Chen, Nan-Kuang
;
Hung, Chi-Ming
;
Chi, Sien
;
Lai, Yinchieh
;
光電工程學系
The transition rate of the stimulated emission at the higher energy levels of the excited states in a silica-based erbium-doped fiber can be enhanced by introducing fundamental-mode cutoff filtering mechanism. The electrons excited by optical pumping can more occupy the higher energy levels of the excited states when the transition rate for the lower energy levels (longer wavelengths) of the excited states is substantially suppressed. The achieved lasing wavelength can thus be moving toward the shorter wavelengths of the gain bandwidth. The laser transition between I-4(13/2) -> I-4(15/2) multiplets of the silica-based erbium-doped fiber is known to emit fluorescence with the shortest wavelength around 1450 nm. We, for the first time, experimentally demonstrate a widely tunable fiber laser at the wavelength very close to 1450 nm by using a standard silica-based C-band erbium-doped fiber. The tuning range covers 1451.9-1548.1 nm, with the best temperature tuning efficiency as high as 57.3 nm/degrees C, by discretely introducing tunable fundamental-mode cutoff tapered fiber filters along a 16-m-long erbium-doped fiber under a 980 nm pump power around 200 mW. The signal-ASE-ratio can be higher than 45 dB whereas the FWHM of the laser lasing lights can be reduced below 0.2 nm by using an additional Fabry-Perot filter. (c) 2007 Optical Society of America.