谐振式集成光学陀螺中电流调谐致强度噪声研究

Study on current-tuning-induced intensity noise in resonator integrated optic gyro

采用半导体激光器(LD)是谐振式集成光学陀螺(RIOG)小型化发展的重要趋势,但是LD的电流调谐特性会引入强度噪声.理论分析了电流调谐致强度噪声对开环RIOG性能的影响,得到频率锁定位置与LD输出光强之间为线性关系.随后,提出了基于频率锁定位置的强度噪声抑制方案,通过频率锁定位置实时监测LD输出光强的变化,根据监测值得到补偿系数,并补偿陀螺输出.建立了抑制电流调谐致强度噪声的理论模型,并进行了实验验证,RIOG的零偏稳定性由0.768(°)/s提高到0.103(°)/s.

Resonator integrated optic gyro （RIOG） employing laser diode （LD） is beneficial to miniaturi- zation developing. However, when the frequency of the LD is tuned by current, accompany intensity noise is produced. Influence of current-tuning-induced intensity noise on the open-loop RIOG was theoretically analyzed; linear relationship between frequency locking position and output intensity of the LD was obtained. Subsequent- ly, method of the intensity noise elimination was proposed based on the frequency locking position. Intensity fluctuation of the LD was monitored in real time by the frequency locking position. Compensation coefficients were calculated according to the monitor values, and they were used to compensate the gyro output. Finally, theoretical model that suppressing the current-tuning-induced intensity noise was set up, and the experiments were demonstrated, in which the bias stability of the RIOG was improved from 0. 768（°）/s to 0. 103 （°）/s.