We theoretically discuss 40 Gb/s semiconductor optical amplifier （SOA）-based wavelength conversion （WC） using a detuning optical bandpass Jilter based on ultrafast dynamic characteristics of SOA. Both the inverted...We theoretically discuss 40 Gb/s semiconductor optical amplifier （SOA）-based wavelength conversion （WC） using a detuning optical bandpass Jilter based on ultrafast dynamic characteristics of SOA. Both the inverted and noninverted WCs are obtained by shifting the filter central wavelength with respect to the probe wavelength when input data signal is in return-to-zero （RZ） format. However, we can obtain format conversion from nonreturn- to-zero （NRZ） to pseudo-return-to-zero （PRZ） and inverted WC when the input signal is in NRZ format.展开更多
Employing the Mueller matrix method with polar decomposition, we analyse the polarization rotation （PR） effects in semiconductor optical amplifiers （SOAs） and demonstrate that the PR angle is linear to the birefri...Employing the Mueller matrix method with polar decomposition, we analyse the polarization rotation （PR） effects in semiconductor optical amplifiers （SOAs） and demonstrate that the PR angle is linear to the birefringence dependent gain while the average PR coefficient is about 0.625 for the employed SOA. It is further evident that the current and optical intensity dependent PRs rotate reversely around the same axis. Thus we propose an optical-electric synchronous control scheme to obtain orthogonal polarization states with power-equalization, and implement it by a polarization-sensitive SOA. The polarization duration time is about 10 ns which is applicable to high-speed polarization state generation.展开更多
Crosstalk in FBG-MOC-based OXCs is simulated using scattering parameters and compared with that in FBG-OC-based OXCs. The former is able to enhance the output power without significant degradation in signal-to-crossta...Crosstalk in FBG-MOC-based OXCs is simulated using scattering parameters and compared with that in FBG-OC-based OXCs. The former is able to enhance the output power without significant degradation in signal-to-crosstalk ratio compared with the latter.展开更多
We measured macro-bending losses for two large mode area photonic crystal fibers. Experimental results show that macro-bending loss and loss window are dependent on the parameter d/∧ and number of air-holes ring in t...We measured macro-bending losses for two large mode area photonic crystal fibers. Experimental results show that macro-bending loss and loss window are dependent on the parameter d/∧ and number of air-holes ring in the cladding.展开更多
基金Supported by the National High Technology Developing Programme of China under Grant No 2006AA03Z0414, the National Natural Science Foundation of China under Grant No 60407001, and the New Century Excellent Talent Project in the Ministry of Education of China under Grant No NCET-04-0715.
文摘We theoretically discuss 40 Gb/s semiconductor optical amplifier （SOA）-based wavelength conversion （WC） using a detuning optical bandpass Jilter based on ultrafast dynamic characteristics of SOA. Both the inverted and noninverted WCs are obtained by shifting the filter central wavelength with respect to the probe wavelength when input data signal is in return-to-zero （RZ） format. However, we can obtain format conversion from nonreturn- to-zero （NRZ） to pseudo-return-to-zero （PRZ） and inverted WC when the input signal is in NRZ format.
基金Supported by the National High-Tech Research and Development Programme of China under Grant No 2007AA01Z270, the National Natural Science Foundation of China under Grant No 60877057 and the Ph.D. S＆T Innovation Fund of Beijing Jiaotong University.
文摘Employing the Mueller matrix method with polar decomposition, we analyse the polarization rotation （PR） effects in semiconductor optical amplifiers （SOAs） and demonstrate that the PR angle is linear to the birefringence dependent gain while the average PR coefficient is about 0.625 for the employed SOA. It is further evident that the current and optical intensity dependent PRs rotate reversely around the same axis. Thus we propose an optical-electric synchronous control scheme to obtain orthogonal polarization states with power-equalization, and implement it by a polarization-sensitive SOA. The polarization duration time is about 10 ns which is applicable to high-speed polarization state generation.
文摘Crosstalk in FBG-MOC-based OXCs is simulated using scattering parameters and compared with that in FBG-OC-based OXCs. The former is able to enhance the output power without significant degradation in signal-to-crosstalk ratio compared with the latter.
文摘We measured macro-bending losses for two large mode area photonic crystal fibers. Experimental results show that macro-bending loss and loss window are dependent on the parameter d/∧ and number of air-holes ring in the cladding.
