Fiber-optic gyroscope capable of inhibiting relative strength noise

Abstract

The invention discloses a fiber-optic gyroscope capable of inhibiting relative strength noise. Optical signals emitted by a light source pass through a 2 * 2 coupler and enter a Y waveguide, two beamsof optical signals which are propagated clockwise and anticlockwise are combined in the Y waveguide to generate interference, the optical power ratio of the two beams of optical signals is 1: 1, andthe interference optical signals comprise Sagnac phase difference information. Interference light waves finally pass through the 2 * 2 coupler to enter the photoelectric detector A, optical signals entering the photoelectric detector B after passing through the optical fiber ring do not contain Sagnac phase difference information, and two beams of optical signals in the photoelectric detector A and the photoelectric detector B are at the same moment. Based on the requirement of inhibiting the relative intensity noise of the fiber-optic gyroscope, the fiber-optic gyroscope provided by the invention is simple in optical path structure, capable of inhibiting the relative intensity noise, low in implementation difficulty, cost-saving and beneficial to engineering batch application.

Description

technical field [0001] The invention belongs to the technical field of optical fiber gyroscope production, in particular to an optical fiber gyroscope capable of suppressing relative intensity noise. Background technique [0002] Fiber optic gyro (FOG) is a new type of all-solid-state angular velocity measurement device based on the Sagnac effect, because of its high precision, large range, small size, light weight, low cost, long life, high integration, and low engineering difficulty. It is widely used in military fields such as aviation, aerospace, and navigation due to its advantages, and is one of the important components in the field of inertial technology. [0003] The current mainstream fiber optic gyroscope technology scheme uses semiconductor radiation sources such as SLD and ASE to provide optical signals for the system optical path, and calculates the Sagnac phase difference by detecting the light intensity returned to the photodetector in real time, so as to obta...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a new design of the optical path structure and the Y waveguide used in this solution based on the requirement of the fiber optic gyroscope to suppress the relative intensity noise.

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