基于Fabry-Perot半导体激光器实现全光波长转换及其最优纵模选择

采用Fabry-Perot半导体激光器作为波长转换器件，利用半导体激光器内部的交叉增益调制效应，通过同时将脉冲信号光与连续探测光耦合到半导体激光器，实现了对波长为1552.62nm、重复速率为2.7GHz的光脉冲信号转换到波长为1548.23nm的连续激光，同时实现了脉冲时间抖动的抑制.实验发现，对于确定的半导体激光器及其工作参数，总存在一个固定的纵模，当探测光的波长与该纵模波长一致时可获得最高的波长转换效率和最大的消光比.理论分析了探测光与Fabry-Perot半导体激光器多纵模间的模式选择对波长转换效 关键词： 纵模选择 波长转换 注入锁定 交叉增益调制

All optical wavelength conversion and optimum longitudinal mode selection using an injection-locked Fabry-Perot laser diode

Based on the cross-gain modulation effect in Fabry-Perot laser diode (FP-LD), the 2.7GHz optical pulsed signal at 1552.30nm is converted to a continuous-wave light at 1548.22nm in experiment. The variation of wavelength conversion efficiency with injection optical power and wavelength are examined in detail. Our research results indicate that there always exists a fixed longitudinal mode for a given FP-LD under certain working conditions to maximize the extinction ratio of conversion signal and conversion efficiency when the longitudinal mode is locked by the probe light. Our theoretical analysis accords with the experiment results. Moreover, there always exist an optimum signal power and a detuning range between the probe light and the longitudinal mode to improve the conversion signal further under the same longitudinal mode locked by the probe light. The optimum longitudinal mode can be determined by the FP-LD characteristics and its working conditions.