Estimation method for performance of depolarized optical fiber gyro depolarizer

Abstract

This invention discloses an evaluation method of function of impartial optical fiber top depolarizer. Laoaite depolarizer implements its function through energy uniformization of polarized light arbitrarily in all polarization state. The efficiency depends on the length of two polarization optical fiber and the precision of its birefringent Spindle 45degree angle .The evaluation method of this invention has three steps: first, put the impartial optical fiber top which error of birefringent Spindle is major on the set magnetic field to test the sensitivity of axial magnetic field, yield the characteristic factor of fiber loop; then, determine the Error Threshold of 45degree angle of depolarizer; subsequently, placed the impartial optical fiber top which contains depolarizer of pending evaluation on the magnetic field, measure the sensitivity of axial magnetic field; eventually, compare the sensitivity of axial magnetic field of the new impartial optical fiber top with the axial magnetic field corresponding with the threshold, evaluate the efficiency of the depolarizer. This invention can be precise and rapid evaluation of Laoaite depolarizer.

Description

technical field [0001] The invention relates to a method for evaluating the performance of a depolarized fiber optic gyro depolarizer. Background technique [0002] The depolarizer is the core optical component of the depolarized fiber optic gyroscope. Its existence greatly suppresses various effects, enhances the reliability and anti-interference ability of the fiber optic gyroscope, and improves the measurement accuracy of the depolarized fiber optic gyroscope. The depolarizer used in the depolarization fiber optic gyroscope is a Lloyd depolarizer that is welded at 45° between two high-birefringence polarization-maintaining fiber spindles. Due to the limitation of the current welding process, there is a certain error in the 45° fusion. The existence of this error reduces the performance of the depolarizer, thereby reducing the performance of the depolarized fiber optic gyro. At present, the method of evaluating the performance of the depolarizer is to use a high-precision...

AI Technical Summary

Problems solved by technology

The depolarizer used in the depolarization fiber optic gyroscope is a Lloyd depolarizer that is welded at 45° between two high-birefringence polarization-maintaining fiber spindles. Due to the limitation of the current welding process, there is a certain error in the 45° fusion. The existence of this error degrades the performance of the depolarizer, thereby reducing the performance of the depolarized fiber optic gyro

At present, the method of evaluating the performance of the depolarizer is to use a high-precision fusion splicer or to test the zero-bias stability of the depolarized fiber optic gyroscope for a long time: but the high-precision fusion splicer can only increase the 45° error to within 0.5 degrees. Small angle error, there is no effective measurement method at home and abroad; testing the bias stability of the depolarized fiber optic gyroscope to evaluate the performance of the depolarizer is also a method, but due to the limitation of the signal processing circuit itself, it must be tested for a long time (test time Generally more than 12 hours) to effectively evaluate the impact of the depolarizer on the gyro, no doubt the efficiency is very low, which is very unfavorable to the development and engineering of the depolarized fiber optic gyro

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