Multi-loop type photonic band gap optical fiber gyroscope based on reflection

Abstract

The invention discloses a multi-loop type photonic band gap optical fiber gyroscope based on reflection. The multi-loop type photonic band gap optical fiber gyroscope comprises a light source, a coupler, a Y waveguide, a photonic band gap optical fiber ring and a detector, wherein the light source and the detector are directly coupled with a tail fiber of the input end of the Y waveguide by a semi-transparent and semi-reflection membrane to realize light splitting; the two output ends of the Y waveguide are directly coupled with the two ends of the photonic band gap optical fiber ring; and the end faces of the output ends of the Y waveguide are covered with reflection membranes. According to the multi-loop type photonic band gap optical fiber gyroscope based on the reflection, the end face reflection between a traditional optical fiber and a photonic band gap optical fiber is utilized, so that a plurality of circulation loops of the gyroscope are realized, and a Sagnac effect is enhanced; and the length of the optical fiber ring is reduced on the premise that the precision is guaranteed, the low cost and miniaturization of the photonic band gap optical fiber gyroscope are easy to realize, and nonreciprocal errors caused by the change of the external environment can be effectively inhibited.

Description

technical field [0001] The invention relates to a reflection-based multi-circle photonic bandgap fiber optic gyroscope, which belongs to the technical field of fiber optic gyroscopes. Background technique [0002] As a new type of inertial angular velocity sensor that is developing extremely rapidly, fiber optic gyroscope has its unique technical and performance advantages, such as all-solid-state structure, high reliability, long life; fast start-up speed, short response time; large measurement range and wide dynamic range ; Anti-shock, vibration, chemical corrosion resistance; small size, light weight, low cost; suitable for mass production, etc., have been widely used in various fields. [0003] Optical fiber is the main transmission medium in fiber optic gyroscope. The ordinary Panda-type polarization-maintaining optical fiber usually used in existing fiber optic gyroscopes has guided wave characteristics that are sensitive to external temperature, electromagnetic and o...

AI Technical Summary

Problems solved by technology

Although the structure of this kind of interferometer is simple, with the continuous expansion of the application field of fiber optic gyro, the long sensitive ring length makes it vulnerable to the influence of the external environment and introduces non-reciprocal errors, which restricts the improvement and development of fiber optic gyroscope precision.

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