Device and method for reducing random walk coefficient of fiber optic gyroscope with active spectral filtering

Abstract

The invention discloses an apparatus and method for reducing the random walk coefficient of a fiber optic gyro by using active spectral filtering. The apparatus mainly comprises an active spectral filter connected with and arranged between a broadband light source and an optical fiber coupler III, wherein the active spectral filter comprises optical fiber couplers, optical fibers and an optical amplifier; the broadband light source is connected with one end of one side of the optical fiber coupler I, and the other end of the side of the optical fiber coupler I is separately connected with theoptical fiber coupler II and the optical fiber coupler III; and one end of the other side of the optical fiber coupler I is connected with the optical fiber coupler III sequentially via the optical amplifier and the optical fiber II. The apparatus and method of the invention reduce the influence of relative intensity noise and shot noise on the random walk coefficient of the fiber optic gyroscope,improve the measurement precision of the fiber optic gyroscope, realize suppression of the relative intensity noise of the light source and have amplification effect on input optical power, thereby improving the probe light power of the fiber optic gyroscope and reducing the influence of shot noise on the random walk coefficient of the fiber optic gyroscope.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing in optoelectronic technology, in particular to a device and method for reducing the random walk coefficient of an optical fiber gyroscope by using active spectral filtering. Background technique [0002] Fiber optic gyro is a new type of optical angular velocity measuring instrument. Its working principle is a fiber optic interferometer based on the optical Segneck effect, that is, when the ring interferometer rotates, a phase difference proportional to the rotation rate is generated. By detecting the phase The angular velocity of the system where the ring interferometer is located can be obtained, and the angular velocity can be provided to the application system as an input for navigation and control. Fiber optic gyroscopes are widely used in navigation and attitude control systems due to their advantages of solid state, wide bandwidth and digital output with multiple protocols. A...

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Problems solved by technology

[0006] Aiming at the problem that the insertion loss is too large and the noise suppression effect is small in the traditional scheme of using a passive fiber optic ring resonator to suppress the relative intensity noise of the light source, the present invention provides a method that uses active spectral filtering to reduce the random walk coefficient of the fiber optic gyroscope. Apparatus and method

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