Noise phase resolving and modulating system for fiber-optic gyroscope

By combining an optical fiber coupler and a spectrometer, orthogonal superposition of the signal light and reference light of the fiber optic gyroscope is achieved, which solves the problems of noise suppression and scale factor drift of the fiber optic gyroscope, improves the signal-to-noise ratio and zero-bias stability of the fiber optic gyroscope, and ensures long-term accuracy and reliability.

CN120890435APending Publication Date: 2025-11-04HUNAN AEROSPACE ELECTROMECHANICAL EQUIP & SPECIAL MATERIAL INST
0 Cites 0 Cited by

Patent Information

Application Number
CN202511296559.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-11
Publication Date
2025-11-04

AI Technical Summary

Technical Problem

Existing noise suppression methods for fiber optic gyroscopes suffer from poor dynamic response, difficulty in bias control using light intensity modulation, and poor long-term stability of the scaling factor due to aging of optical devices and wavelength drift of the light source.

Method used

A noise cancellation demodulation system consisting of an ASE light source, a fiber optic circulator, a fiber optic beam splitter, and a spectrometer is used. The splitting ratio of the fiber optic beam splitter is matched to achieve orthogonal superposition of the signal light and the reference light. Combined with spectrometer data processing, the center wavelength drift is corrected to compensate for the scaling factor.

Benefits of technology

This improves the signal-to-noise ratio and zero-bias stability of the fiber optic gyroscope, ensuring long-term accuracy and reliability, reducing costs, and avoiding problems caused by the aging of optical attenuators.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to the technical field of fiber-optic gyroscopes, and discloses a fiber-optic gyroscope noise phase resolving and modulating system so as to improve the precision of the fiber-optic gyroscope. The system comprises an ASE light source, an optical fiber circulator, a first optical fiber coupling beam splitter, a second optical fiber coupling beam splitter, a Y waveguide, an optical fiber ring, a spectrograph and a control host. Wherein the first optical fiber coupling beam splitter and the second optical fiber coupling beam splitter are used for carrying out light intensity superposition on two paths of signal light and reference light which have correlation and both contain relative intensity noise in a spectrograph in an orthogonal mode, so that common terms of the two paths of relative intensity noise can be counteracted, and meanwhile, the relative intensity noise of the two paths of relative intensity noise can be eliminated. The control host intercepts a spectral band with composite constraint of flatness and bandwidth range from spectral data detected by the spectrometer, and calculates the central wavelength of the intercepted band while taking light intensity data integrated by the intercepted band as closed-loop feedback quantity acting on the Y waveguide after gain processing; the scale factor that varies with the drift of the center wavelength is then corrected according to the calculation result of the center wavelength.
Need to check novelty before this filing date? Find Prior Art