Fiber-optic gyroscope and relative intensity noise suppression device and method thereof

Abstract

The invention discloses a fiber-optic gyroscope and a relative intensity noise suppression device and method thereof. A path of redundant light is led out by utilizing the blind end of an optical fiber coupler, the redundant light is reflected back to the optical fiber coupler after being attenuated twice by an optical fiber attenuator and rotated by 90 degrees through polarization of an optical fiber Faraday rotation reflector, and in the optical fiber coupler, the signal light and the reflected and attenuated light are subjected to intensity superposition and do not interfere with each other, so that the purpose of reducing relative intensity noise is achieved. According to the device, on the basis of only utilizing the idle blind end of the optical fiber coupler, an optical fiber attenuator and a single-mode optical fiber Faraday rotating reflector are additionally arranged, so that the suppression purpose can be achieved, the structure is simpler, the cost is low, the advantage ofhigh cost-effectiveness ratio of noise suppression is achieved, and the device has important application and popularization value.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and in particular relates to a fiber optic gyroscope relative intensity noise suppression device and method based on a fiber optic attenuator and a Faraday rotating mirror. Background technique [0002] The relative intensity noise of fiber optic gyroscope has become an important noise source in high precision fiber optic gyroscope. The researchers propose that a light source with low relative intensity noise is important for the noise level of a high-precision fiber optic gyroscope. Under the same light source conditions, in order to obtain low-noise and high-precision fiber optic gyroscopes, researchers have also continuously studied and proposed various relative intensity noise suppression methods. For example, two photodetectors are used to separate the light from the light source for direct intensity detection, and then the analog optical signal is transmitted to the digital ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned suppression processing methods all have the characteristics of high cost and complex structure, which in turn results in very limited cost performance and cost-effectiveness ratio of noise suppression.

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