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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。
Reported the use of active optical feedback technology for semiconductor laser chirp research. The self-zero difference detection technique is used to characterize the FM nonlinearity; the resulting beat signal is given an offset relative to the ideal LFM by the frequency identification circuit; the error signal is fed back to the laser’s modulation current to form a photoelectric feedback loop, Linearization. Experiments using 1550nm distributed feedback laser, the modulation current of 20mA, scanning period of 30ms, to achieve the chirp range of 10GHz. System stability, easy to operate. The method is of great significance for the measurement and application of FM continuous wave laser radar and optical frequency domain reflectometer.