Research on Light Source Power and Temperature Control and Fast-start Technology of Fiber Optic Gyroscope

The traditional optical power control technology of fiber optic gyroscope is to sample, demodulate and other processing of the electrical signal output by the PIN-FET to obtain real-time optical power, and then maintain the stability of optical power through feedback control. In this paper, the accurate optical power information is obtained in real time through the Micro-photodetector (MPD), and then the PID optical power control algorithm is introduced, with the digital current source as the controlled object, and the optical power fluctuation under full temperature conditions is minimized by adjusting the control parameters. At the same time, in order to cope with the problem of slow system start at the extreme temperature, the double-layer PID algorithm is used to nest, and the PID fast start algorithm is started when the fiber optic gyro system is just powered on, which makes the optical power approach the target faster and more conducive to fast start, and after the start is completed, it is switched to the optical power control algorithm to achieve accurate control, and the smooth switching of the two sets of PID algorithms makes the system have the advantages of fast startup and small optical power fluctuation at full temperature.