Secondary 90-degree rotatably-welded polarizing optical fiber resonant cavity

Abstract

The invention discloses a secondary 90-degree rotatably-welded polarizing optical fiber resonant cavity. The secondary 90-degree rotatably-welded polarizing optical fiber resonant cavity comprises a first polarization-maintaining fiber coupler, a first 90-degree rotary welding point, a third tail fiber, a second polarizer, a fourth tail fiber and a second 90-degree rotary welding point, wherein the first polarization-maintaining fiber coupler comprises a first tail fiber, a second tail fiber, the third tail fiber and the fourth tail fiber; and an optical fiber ring is combined by a first tail fiber, the first 90-degree rotary welding point, the third tail fiber, the second polarizer, the fourth tail fiber, a second 90-degree rotary welding point and the second tail fiber. The secondary 90-degree rotatably-welded polarizing optical fiber resonant cavity disclosed by the invention compensates double refraction of the resonant cavity, inhibits the resonance in one intrinsic polarization state, avoids the mutual coupling between the intrinsic polarization states, improves the temperature stability of a resonant type fiber-optic gyroscope in a full temperature range, and has important scientific meanings and application values.

Description

technical field [0001] The invention relates to an optical fiber resonant cavity, in particular to a polarized optical fiber resonant cavity with two times of 90° rotation fusion splicing. Background technique [0002] The polarization-maintaining fiber resonator is the core sensitive part of the resonant fiber optic gyroscope. One output end of a 2×2 polarization-maintaining fiber coupler is connected to the corresponding input end to form a basic reflective resonator. structure. Intrinsic state of polarization (Eigenstate of polarization, ESOP) refers to the polarization state that remains unchanged after a cycle of transmission in the fiber resonator. A fiber resonator usually consists of two ESOPs. The defects of PM fiber couplers (polarization crosstalk and polarization-independent loss) and the sensitivity of PM fiber birefringence to temperature lead to mutual coupling of two ESOPs, which not only superimpose each other in magnitude but also interfere with each othe...

AI Technical Summary

Problems solved by technology

A 90-degree rotary fusion excites two equal ESOPs in the cavity, which introduces large polarization interference noise and possible secondary Kerr effects

Two times of 90-degree rotary welding can only excite the resonance of a certain ESOP at a specific temperature point, but it cannot suppress polarization noise in the full temperature range

Polarized fiber resonator, by adding a polarization device in the cavity, suppresses the resonance of an ESOP, but still introduces a large polarization noise

Therefore, the current fiber optic resonator cannot effectively suppress the polarization noise of the resonator fiber optic gyro

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