Relative intensity noise suppression device for high-precision fiber-optic gyroscope

Abstract

The invention discloses a relative intensity noise suppression device for a high-precision fiber-optic gyroscope. The relative intensity noise suppression device comprises an amplified spontaneous radiation light source, a polarization-maintaining circulator, a 99 / 1 polarization-maintaining coupler, a Y waveguide, a fiber-optic ring, a detector A, a polarization-maintaining isolator, a detector Band a signal processing module. According to the relative intensity noise suppression device, the influence of RIN on the detection precision of the high-precision fiber-optic gyroscope can be effectively suppressed, the structure is simple, and the cost is relatively low; and optical power matching of a signal optical path and a reference optical path can be realized by means of a comparator andclosed-loop control, so that the fiber-optic gyroscope keeps the optimal suppression effect on relative intensity noise.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, in particular to a relative intensity noise suppression device. Background technique [0002] Gyroscope is the core component of inertial system and one of the key contents of inertial technology research. The fiber optic gyroscope is a kind of optical fiber sensor sensitive to angular rate. It is actually a ring interferometer based on the Sagnac effect. It calculates the angular rate of the closed optical path by detecting the phase difference between two counterpropagating beams. Because it has the advantages of all solid state, low cost, high reliability, and fast start-up speed, it is widely used in aircraft, submarines, warships, missiles, satellites and other fields, and has become a research hotspot of inertial devices at home and abroad in recent years. [0003] In high-precision fiber optic gyroscopes, in order to eliminate the influence of back reflection and scattering...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the relative intensity noise restricts the random walk coefficient and affects the detection signal-to-noise ratio caused by the use of a wide-spectrum light source in a high-precision fiber optic gyroscope, and proposes a relative intensity noise suppression device for a high-precision fiber optic gyroscope. The relative intensity noise is suppressed by subtractive compensation technology, and the size of the signal light and the reference light is detected in real time by the comparator. When the signal light and the reference light do not match, the suppression effect decreases, and the modulation depth applied to the Y waveguide is adjusted through closed-loop control. , change the light intensity of the signal light path to achieve optical power matching, so that the relative intensity noise suppression can achieve the best effect

Images