Single-light-source dual-polarization optical fiber gyroscope

Abstract

The invention provides a single-light-source dual-polarization optical fiber gyroscope. The single-light-source dual-polarization optical fiber gyroscope comprises a light source, a polarizer, a depolarizer, a coupler, a first polarized light path, a second polarized light path and a polarization maintaining optical fiber ring, wherein the light source, the polarizer, the depolarizer and the coupler are sequentially connected in series, the output end of the coupler is connected with the input ends of the first polarized light path and the second polarized light path which are connected in parallel, and the output ends of the first polarized light path and the second polarized light path are connected with the polarization maintaining optical fiber ring; and a time delay module is connected in series between the output end of the coupler and the input end of the second polarized light path. The polarizer and the depolarizer are firstly used for realizing power equalization of the double polarized light, the time delay module enables the double polarized light to have a phase difference, and then reverse modulation is carried out on the double polarized light, so that polarization cross coupling noise in the optical fiber can be effectively reduced, and the optical fiber gyroscope has very important significance for improving the wandering and zero-bias performance of the optical fiber gyroscope.

Description

technical field [0001] The present application relates to the technical field of gyroscopes, in particular to a fiber optic gyroscope with single light source and dual polarization. Background technique [0002] A fiber optic gyroscope is a sensor that measures the angular velocity of an object's inertial motion. Due to its high precision, stable performance, good reliability, strong anti-interference ability and long life, it is widely used in missiles, aviation, aerospace, navigation and other fields. [0003] The fiber optic gyroscope is a directional device based on the Sagnac effect. The basic working principle of the optical gyroscope is: two beams of light with the same characteristics in a closed optical path move clockwise (CW) and counterclockwise respectively. When transmitting in the (CCW) direction, if there is rotation in the optical path, the two beams of light will produce a phase difference related to the rotational angular velocity, so that the rotational ...

AI Technical Summary

Problems solved by technology

However, the dual-polarization fiber optic gyroscope is measured by detecting the optical compensation effect of the light in the two polarization directions in the closed optical path. Cross-coupling, that is, the light transmitted on one of the main axes (such as the fast axis) may be coupled into the other main axis (such as the slow axis) due to stress, and the light entering the other main axis is coupled light, due to the fast axis and the slow axis. The light is emitted by the same light source and has a certain degree of coherence. The coupled light will interfere with the light of the main axis and affect the demodulation of the real signal.

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