半导体激光器光电负反馈线性调频技术研究  

Research on Optical Chirp Linearization Technique of Semiconductor Lasers by an Optoelectronic Feedback Loop

作　　者：吴映[1,2] 陈迪俊[1] 孙延光[1,2] 蔡海文[1] 瞿荣辉[1] 

机构地区：[1]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2013年第9期1-6,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61108028;61178031;61137004);上海市科委重点基础项目(11JC1413500)

摘　　要：报道利用主动光电反馈技术实现半导体激光器线性调频技术的研究。使用自零差探测技术表征调频非线性;所得拍频信号经鉴频电路给出相对于理想线性调频的偏移;获得误差信号反馈到激光器的调制电流上,构成一个光电反馈环,主动控制调频线性化。实验采用1550nm的分布反馈激光器,调制电流为20mA,扫描周期为30ms,实现线性调频范围为10GHz。系统稳定性好,操作方便。该方法对于调频连续波激光雷达、光频域反射仪等测量应用有重要意义。The research on chirp linearization of a semiconductor laser using an optoelectronic feedback loop is reported. Self-homodyne detection is adopted to characterize the chirp nonlinearities. The beat signal is fed to a frequency discriminator circuit, which measures the laser instantaneous frequency deviation from a perfectly linear chirp and provides an error signal. The error signal is fed back to the modulation current of the laser, and thus an optoelectronic feedback loop is achieved and linear tuning is realized. The experiment is conducted with a 1550 nm distributed feed back （DFB） laser. The injection current is modulated by a ramp with 20 mA in amplitude and 30 ms in period. A linear tuning range of 10 GHz is realized in experiment. The system is both stable and effective. This technique is of significance to applications such as frequency-modulated continuous-wave laser radar, optical frequency-domain reflectometry etc.

关 键 词：激光器 线性调频 自零差探测 光电反馈 

分 类 号：TN248.4[电子电信—物理电子学]