Single polarization fiber resonant cavity based on 45-degree slant angle FGB (fiber bragg grating) technology

Abstract

The invention discloses a single polarization fiber resonant cavity based on a 45-degree slant angle FGB (fiber bragg grating) technology. The single polarization fiber resonant cavity comprises a PM (polarization maintaining) fiber coupler, an input end, an input end, a 45-degree slant angle FGB and a fusion welding point, wherein the PM fiber coupler is provided with the output end and the input end; the fusion welding point is arranged between the output end and the input end; and the 45-degree slant angle FGB is written into the output end to serve as a polarizer of the fiber resonant cavity. The polarizer has low insertion loss; the 45-degree slant angle FGB is written into the PM fiber coupler so as to overcome the defects of high loss of polarization devices such as a single polarization fiber and the like, loss of fusion welding among the polarization devices and the fiber resonant cavity, mismatching of mode diameters and the like; therefore, the single polarization fiber resonant cavity based on the 45-degree slant angle FGB technology not only overcomes the noise of polarization fluctuation, but also has high resolution, can be applied to resonant type fiber gyros or other sensing fields and has important scientific significance and application value.

Description

technical field [0001] The invention relates to a single polarization fiber resonant cavity based on the 45-degree tilt angle fiber grating technology. Background technique [0002] The fiber optic ring resonator is the core sensitive part of the Resonator Fiber-Optic Gyro (RFOG). One of the output ends of a 2×2 fiber optic coupler is connected to one of the input ends through a splicing point. Constitutes a most basic reflective resonator structure. In the fiber ring resonator, except for special cases, there are two intrinsic polarization states (Eigenstate of polarization, ESOP). Typically, one ESOP is orthogonal to another ESOP. Due to the influence of environmental factors, the shape of the ESOP is changing and moving independently of each other, which creates noise in the output of the gyro. Polarization fluctuation noise is one of the important optical noise sources in resonant fiber optic gyro system. In order to overcome the influence of polarization fluctuation...

AI Technical Summary

Problems solved by technology

However, according to the current technology level, the loss of the polarization device (single polarization fiber or polarizer) is large, which is limited by the loss of the polarization device itself, the fusion loss with the fiber resonator, and the mismatch of the mode diameter. Therefore, the single polarization The clarity of the fiber resonator is poor and cannot be used in RFOG or other sensing fields

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