An optical cancellation scheme of relative intensity noise for high precision fiber optic gyroscope

In this paper, an optical cancellation scheme is proposed to suppress the relative intensity noise of fiber optic gyroscope. High precision fiber optic gyroscope usually uses high power light source to improve strength. Relation intensity noise becomes the main noise source of gyroscope. The all-fiber structure is adopted, and the correlation between the optical signal at the idle end of the coupler and the relative intensity of the interference signal is used for noise cancellation, so as to improve the accuracy of fiber optic gyroscope and reduce the process difficulty and production cost of high- precision fiber optic gyroscope.