Memory and I/O bridge controller (MIOC) integrated optical circuit for depolarization input/output of fiber optic gyroscope (FOG)

Abstract

The invention discloses a memory and I / O bridge controller (MIOC) integrated optical circuit for depolarization input / output of a fiber optic gyroscope (FOG), which can efficiently integrate an LYOT depolarizer with an MIOC so as to shorten the length of a polarization-preserving fiber for the LYOT depolarizer, can reduce the technique difficulty and the cost of inducted polarization-preserving fiber materials and improve the long-term reliability of a system. The realizing method of the MIOC integrated optical circuit is to rotate a stress area of the output part of a tail fiber of the MIOC integrated optical circuit and the polarization state of MIOC waveguide output light wave by 45 degrees.

Description

technical field [0001] The invention relates to an optical gyroscope, which belongs to the technical field of gyroscopes, in particular to an integrated optical path used in an optical fiber gyroscope. Background technique [0002] The orientation of the stress axis of the polarization-maintaining pigtail of the traditional MIOC integrated optical multifunctional modulator is the same as the polarization state of the light wave transmitted in the chip waveguide, slow axis or fast axis, to maintain polarization stability. [0003] In order to reduce the cost of polarization-maintaining fiber, the fiber ring selected by the depolarization fiber optic gyroscope is a common single-mode fiber. When polarized light waves propagate in it, the polarization state will change due to distortion, stress birefringence and other reasons. Therefore, it is necessary to splice the polarization-maintaining optical fiber aligned at 45 degrees in the polarization-maintaining stress zone, which...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to splice the polarization-maintaining optical fiber aligned at 45 degrees in the polarization-maintaining stress zone, which is used to fully fuse the light waves with two polarization directions orthogonal to each other, as a LYOT depolarizer, to reduce their difference, but this has led to the current There are many intermediate optical fusion points in the assembly of the fiber optic gyroscope. MIOC has 3 sections connected to the polarization-maintaining optical fiber, which requires 3 LYOT depolarizers. The input end of the light source is depolarized once, and the optical fiber ring is depolarized twice; The several welding points of the LYOT depolarizer make the assembly of the fiber optic gyroscope difficult, the process is many, the performance is unstable, and the light reflection noise of the welding points in the fiber ring is large.

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