Novel fiber optic gyro interference light path based on photonic crystal fiber

Abstract

A novel fiber optic gyro interference light path based on photonic crystal fiber includes a photonic crystal fiber ring and a Y waveguide integrated optical device. The optical fiber ring adopts an refractive index guided photonic crystal fiber; for winding of the fiber ring, a mode of solidifying one layer after winding is employed; and the Y waveguide tail fiber employs the same type of fiber as the optical fiber ring. The design of photonic crystal fiber meets the requirements of birefringence of gyro and at the same time has the mode field as Y waveguide chip, and a shrinkage cavity method is used for further expansion of the field mode of the optical fiber, so as to reduce additional loss caused by optical fiber splicing. The designed interference optical path has the characteristics of good polarization stability, low magnetic field polarization sensitivity and radiation resistance; the fiber optic gyro using the interference light path has the characteristics of radiation resistance, good temperature stability and low magnetic field sensitivity, and is especially can be used as high precision fiber optic gyroscope for satellite and other space vehicles.

Description

technical field [0001] The invention relates to a novel optical fiber gyroscope interference optical path based on photonic crystal fiber, and belongs to the technical field of optical fiber gyroscopes. Background technique [0002] Due to its small size, light weight, low power consumption, and high reliability, the fiber optic gyroscope has become one of the mainstream instruments in the field of inertial systems and has been widely used in various fields of sea, land, air and space. The block diagram of the fiber optic gyroscope is as follows: figure 1 As shown, the optical path part includes light source, fiber coupler, Y-waveguide integrated optical device, fiber ring and photodetector, wherein the fiber ring is the sensitive part of the fiber optic gyroscope, and the fiber optic gyroscope detects the gap between two beams of light transmitted oppositely in the fiber ring. The phase difference is used to detect the angular velocity to which the gyroscope is sensitive. ...

AI Technical Summary

Problems solved by technology

The process of photonic bandgap optical fiber is quite complicated. So far, the loss of optical fiber is relatively large, and the performance of polarization maintenance is not ideal. However, the refractive index guided solid core photonic crystal fiber is relatively mature and has the potential to be used in fiber optic gyroscopes. Base

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