Optical fiber gyroscope employing single-polarized-output polarization-maintaining loop device

Abstract

The invention discloses an optical fiber gyroscope employing a single-polarized-output polarization-maintaining loop device. Light emitted by a broadband light source enters an end 2-1 of the polarization-maintaining loop device of the light source, a polarized mode is output from an end 2-2 of the polarization-maintaining loop device, the light is split into an upper light beam and a lower light beam through a polarization-maintaining beam splitter of a sensing ring, and the upper light beam clockwise returns to the polarization-maintaining beam splitter through the polarization-maintaining optical fiber sensing ring and a phase modulator; the lower light beam anticlockwise returns to the polarization-maintaining beam splitter through the phase modulator and the polarization-maintaining optical fiber sensing ring; the upper light beam and the lower light beam are synthesized by the polarization-maintaining beam splitter to form interference, the interfered light beam is input through the end 2-2 of the polarization-maintaining loop device and output from an end 2-3 of the polarization-maintaining loop device, a photoelectric detector converts a light signal into an electric signal by and input the electric signal into a signal processing unit, and the signal processing unit generates a signal added to the phase modulator and simultaneously outputs a rotary signal of the gyroscope relative to an inertial reference system. The optical fiber gyroscope can reduce light energy loss caused by the polarization-maintaining loop device of the light source and the use of elements.

Description

Technical field [0001] The present invention relates to a gyroscope, in particular to an optical fiber gyroscope using a single polarization output polarization maintaining circulator. Background technique [0002] Traditional fiber optic gyros such as figure 1 Shown. The light emitted by the broad-spectrum light source 1 is divided into two by the light source polarization-maintaining beam splitter 8. One beam is input to the polarization-maintaining polarizer 9, and then divided into two by the sensor environmental protection polarization beam splitter 3. Clockwise through the polarization-maintaining fiber sensor ring 4, phase modulator 5, and return to the polarization-maintaining beam splitter 3; the lower beam passes through the phase modulator 5, the polarization-maintaining fiber sensor ring 4 in a counterclockwise direction and then returns to the polarization-maintaining beam splitter 器3; The two clockwise light and counterclockwise light are combined by the polarizatio...

AI Technical Summary

Problems solved by technology

The disadvantage of this gyroscope is that when the light beam goes back and forth to the polarization maintaining beam splitter 8 of the light source, the light energy is lost by 6dB, that is, 3 / 4 of the light energy is lost.

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