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增益调制型波长转换中 ,为得到转换后信号最大的消光比 (ER) ,信号光波长应该比半导体光放大器 (SOA)的小信号增益峰值波长长。采用分段模型 ,考虑了SOA中增益谱的不对称性以及增益峰值波长随载流子密度的漂移 ,深入研究了信号光功率 ,ER ,参考光功率 ,波长以及SOA注入电流对选择信号光波长λpk ,s 以及消光比改善量的影响。模拟计算表明 ,信号光功率每增加 3dB ,λpk ,s 就需向长波长移动约 7nm。信号光ER增加、参考光功率增加以及SOA注入电流的增加 ,λpk ,s 需向短波长移动。消光比改善量随信号光功率和电流的增加而显著增加 ,随信号ER的增加而降低 ,但是参考光功率和波长变化时影响不大
In gain-modulated wavelength conversion, the signal light wavelength should be longer than the small signal gain peak wavelength of a semiconductor optical amplifier (SOA) in order to obtain the maximum extinction ratio (ER) of the converted signal. Using the piecewise model, the asymmetry of the gain spectrum and the peak-to-peak wavelength of the gain with the drift of the carrier density are considered. The effects of signal power, ER, reference power, wavelength and SOA injection current on the signal wavelength λpk, s and extinction ratio improvement. Simulation results show that for every 3 dB signal power increase, λpk, s needs to move about 7 nm toward long wavelength. The signal light ER increases, the reference light power increases, and the SOA injection current increases, λpk, s needs to move toward short wavelengths. The improvement of extinction ratio increases with the increase of signal light power and current and decreases with the increase of signal ER, but the influence of reference light power and wavelength is not significant