1.55 mum wavelength high precision fiber gyroscope for eliminating dead zone

Abstract

A high-precision optical gyroscope with 1.55 um wavelength for eliminating dead area, comprising a light path unit and a circuit unit; wherein the circuit unit comprises a laser, a laser driving circuit, a detector, a low pass filter, a analog-to-digital converter and a digital signal processing circuit; the light path unit comprises a spectral filter, an optoisolator, a first wavelength division multiplexer, an Er-doped fiber, a second wavelength division multiplexer, a reflector, a coupler, a Y-waveguide integrated optical device and a fiber coil; the spectral filter outputs superfluorescence with 1.55 um wave band; the light path unit further comprises a digital-analog converter and an amplifier; the digital-analog converter, amplifier and Y-waveguide integrated optical device are packed together by a metal box to form electromagnetic shielding. The invention interferes with the electron between driving signal of the Y-waveguide integrated optical device and the signal received by the detector on the structure to isolate, thereby eliminating the dead area caused by interference.

Description

technical field

[0001] The invention relates to a fiber optic gyroscope, in particular to a high-precision fiber optic gyroscope using a wavelength of 1.55 μm. Background technique

[0002] The interferometric fiber optic gyroscope is an all-solid-state inertial instrument, which has the advantages of high reliability and long life. High-precision fiber optic gyroscopes (with an accuracy better than 0.01° / h) usually use erbium-doped fiber optic light sources with an average wavelength of 1.55 μm . In principle, the fiber optic gyroscope includes two units, the optical path and the circuit. Usually, the optical path unit and the circuit unit are assembled and packaged in the same structure. In order to improve performance, the researchers proposed an assembly form in which the optical unit and the circuit unit are isolated. For a high-precision fiber optic gyroscope with a wavelength of 1.55 μm, the optical unit mainly includes an erbium-doped fiber light source, a coupler, ...

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