Browsing by Author "Yu, Kun-Chieh"

Now showing 1 - 7 of 7

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.
All-optical decision-gating of 10-Gb/s RZ data in a semiconductor optical amplifier temporally gain-shaped with dark-optical-comb
(2007-07-01)
Lin, Gong-Ru
;
Yu, Kun-Chieh
;
Pan, Ci-Ling
;
Liao, Yu-Sheng
;
光電工程學系
We demonstrate a novel all-optical noninverted OC-192 return-to-zero (RZ) decision-gate by using a semiconductor optical amplifier (SOA) which is gain-controlled to achieve an extremely high cross-gain-modulation depth and a narrow gain window. A dark-optical-comb generated by reshaping the optical clock RZ data in a Mach-Zehnder intensity modulator is employed as an injecting source to temporally deplete most of the gain in the SOA. Such a dark-optical-comb injected SOA decision-gate exhibits improved 311 regeneration performances such as a timing tolerance of 33.5 ps, a Q-factor of 8.1, an input dynamical tolerance of 14 dB, and an extinction ratio (ER) of 14 dB. The deviation between the wavelengths of backward injected dark-optical-comb and input RZ data for optimizing the ER of the decision-gate is determined as Delta lambda = 19 nm. Under a threshold operating dark-optical-comb power of 7 dBm, such a decision-gate can recover the - 18.5-dBm degraded RZ data with a bit-error-rate of less than 10(-9) at 10 Gb/s. A negative power penalty of -4.2 dB is demonstrated for the RZ data after 50-km propagation and decision gating.
All-Optical OC-192 RZ data decision gating in dark optical comb injected semiconductor optical amplifier
(2006-01-01)
Liao, Yu-Sheng
;
Yu, Kun-Chieh
;
Lin, Gong-Ru
;
光電工程學系
;
光電工程研究所
We demonstrate a novel all-optical RZ decision gate by using one dark-optical-comb injected SOA which is controlled by a reshaped optical clock with extremely high cross-gain-modulation (XGM) depth and narrow gain window. Such a decision gate exhibits improved 3R regeneration performances including timing tolerance of 33.5 ps, Q factor of 8.1 and extinction ratio of 13.6 dB. The correlation between backward injected dark-comb and input data wavelength region for optimizing the extinction ratio of the decision gated RZ data is determined. Under a threshold operating dark-optical comb power of 7 dBm, such a decision gate can recover the degraded RZ data with a bit-error-rate of less than 10(-9) at 10 Gbits/s.
Duty-Cycle and Chirp Diagnosis of All-Optical Format Conversion Data in Multi- and Single-Wavelength Inverse Optical Comb Injected Semiconductor Optical Amplifier
(2007)
Yu, Kun-Chieh
;
Liao, Yu-Sheng
;
Lin, Gong-Ru
;
光電工程學系
;
Department of Photonics
Comparison on shortened falling-time, reduced chirp and improved on/off extinction ratio of 10Gbit/s all-optical data-format converted pulse-stream in single- and multi-wavelength inverse-optical-comb injected semiconductor optical amplifiers with temporally reshaped gain-window is demonstrated. (c) 2007 Optical Society of America
Dynamic chirp control of all-optical format-converted pulsed data from a multi-wavelength inverse-optical-comb injected semiconductor optical amplifier
(2007-10-01)
Lin, Gong-Ru
;
Pan, Ci-Ling
;
Yu, Kun-Chieh
;
光電工程學系
;
Department of Photonics
By spectrally and temporally reshaping the gain- window of a traveling- wave semiconductor optical amplifier ( TWSOA) with a backward injected multi- or single- wavelength inverse- optical- comb, we theoretically and experimentally investigate the dynamic frequency chirp of the all- optical 10GBit/ s Return- to- Zero ( RZ) data- stream format- converted from the TWSOA under strong cross- gain depletion scheme. The multi- wavelength inverse- optical- comb injection effectively depletes the TWSOA gain spectrally and temporally, remaining a narrow gain- window and a reduced spectral linewidth and provide a converted RZ data with a smaller peak- to- peak frequency chirp of 6.7 GHz. Even at high inverse- optical- comb injection power and highly biased current condition for improving the operational bit- rate, the chirp of the multi- wavelength- injection converted RZ pulse is still 2.1- GHz smaller than that obtained by using single- wavelength injection at a cost of slight pulsewidth broadening by 1 ps. (C) 2007 Optical Society of America.
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.
Optimizing the Extinction Ratio and Error Bit Penalty of the On-Off-Keying Pulse Data With Gain-Constrictive SOA
(2009-03-01)
Lin, Gong-Ru
;
Pan, Ci-Ling
;
Yu, Kun-Chieh
;
光電工程學系
;
Department of Photonics
On/off extinction ratio and receiving power penalties of a 10-Gb/s all-optical on-off-keying pulse data generated from a multiwavelength dark-optical-comb injected semiconductor optical amplifier (SOA) is analyzed. Such an SOA with a temporally constricted gain window is employed to offer an on-off-keying (OOK)-generated data stream with on/off extinction ratio of 17 dB and bit error rate (BER) of 10(-13) at a receiving optical power of 18 dBm. With an input nonreturn-to-zero (NRZ) power as low as 15 dBm and an injected dark-optical-comb power of 16.5 dBm, the generated OOK pulse data reaches a BER 10(-13) at receiving power as low as -18.5 dBm. The OOK operation in the SOA also exhibits a decision-gate function with improved negative power penalty of 1.5 dB as compared with the back-to-back NRZ transmission condition. The injection via a multiwavelength dark-optical-comb source further benefits from a lower noise level as compared with single-wavelength laser or broadband spontaneous emission source. Such a system exhibits a tolerance for detuning timing of >65% period with power penalties on the on/off extinction ratio and the receiving power of 3 and 1 dB, respectively. Even after 25-km propagation in a single-mode fiber spool, there is only a power penalty of 0.5 dB at a BER of 10(-13) obtained for the generated pulse data stream.