Compensation of excess RIN in fiber-optic gyro

Abstract

The paper describes the sources of fundamental noises in FOG measurement signal. Methods of excess relative intensity noise (RIN) compensation are considered. Technique improving the compensation method using division of signals from two photodetectors for noise suppression is proposed and implemented. Functional simulation is conducted, which estimates the limiting theoretical value of noise suppression by the selected compensation method with the photodetector power of min 10 µW. Test results for FOG experimental prototype are presented. Allan variance plots for the cases with and without compensation are constructed.