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1550 nm的分布反馈激光器，调制电流为20 mA，扫描周期为30 ms，实现线性调频范围为10 GHz。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.