A Tunable Self-Calibrating Optical Gyroscope Based on Surface Plasmon Waveguide

Abstract

The invention provides a tunable self-calibration optical gyro based on surface plasmon polariton waveguide. The optical gyro comprises the following components: a light source, a tunable surface plasmon polariton mode splitter, an isolator, a surface plasmon polariton coupler, a Y-branch coupler, a polarizer, a single-mode fiber coil, a detector and phase compensation feedback unit. The inveniton belongs to the field of inertial sensing technology and integrated optics field, and the tunable self-calibration optical gyro based on surface plasmon polariton waveguide is provided, the tunable surface plasmon polariton mode splitter is used in order to realize mode separation and phase compensation of light signals of different polarization states, and the tunable self-calibration optical gyro is realized and has the advantages of low noise, low cost, high precision, wide dynamic range, high stability, and high light source utilization rate.

Description

technical field [0001] The invention belongs to the technical field of integrated optics and inertial sensors, in particular to a tunable self-calibrating optical gyroscope based on surface plasmon waveguides. Background technique [0002] Gyroscope is an important measurement element of inertial navigation system and inertial guidance system, and is the core of the entire inertial system. Its measurement accuracy directly affects the performance of inertial navigation system and inertial guidance system. With the development of inertial technology, various types of gyroscopes have appeared one after another, such as electromechanical gyroscopes such as liquid floating gyroscopes, flexible gyroscopes, electrostatic gyroscopes, and piezoelectric gyroscopes. The optical gyroscope is a new type of photoelectric gyroscope based on the Sagnac effect. The development of its technology benefits from the progress of laser technology and optical communication technology. The emergen...

AI Technical Summary

Problems solved by technology

Due to the existence of polarization errors, the accuracy of optical gyroscopes in current applications is difficult to achieve the application of high-precision navigation products. Therefore, the development of optical gyroscopes that can eliminate polarization errors is the key to the development of optical gyroscopes.

[0003] Traditional optical gyroscopes use polarization-maintaining fibers or depolarizers to reduce polarization errors. However, when optical gyroscopes work for a long time, the parasitic birefringence of optical components such as couplers and Y-waveguide integrated chips in the optical path or internal defects in materials will still affect the optical path. Bringing non-reciprocity, resulting in polarization crosstalk or polarization cross-coupling, resulting in the accumulation of polarization errors over time, the accuracy of the optical gyroscope is limited, and the cost of polarization-maintaining fiber is too high, so the competitiveness of high-precision optical gyroscopes Insufficient, even the application in low-to-medium precision navigation systems is also restricted

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