Panda type polarization maintaining optical fiber

Abstract

The invention relates to a panda type polarization maintaining optical fiber for use in the field of optical fiber guidance and sensing, which comprises a core layer and a pure quartz cladding, wherein stress zones are symmetrically arranged at the two sides of the core layer in the pure quartz cladding. The panda type polarization maintaining optical fiber is characterized in that a depressed inner cladding is arranged outside the core layer, and the space between the boundaries of the stress zones and the boundary of the core layer is reduced, so that the space d between the boundaries of the stress zones and the boundary of the core layer keeps 3-7mu m. The birefringent property of the panda type polarization maintaining optical fiber can be improved by the invention to meet the performance requirements of a high-precision gyro, and the introduction of the depressed inner cladding can effectively reduce the burst probability of the prefabricated core layer in the process of punching in the stress zones under the condition of not increasing the difficulty of process preparation; the depressed inner cladding adopts viscosity doping and matching design, and further reduces the burst probability of the prefabricated core layer caused by the external mechanical stress in the process of punching in the stress zones; and one side of the stress zones and the depressed inner cladding have an overlapped region so as to prevent the mechanical stress from acting on an intrinsic boundary stress concentration point.

Description

technical field [0001] The invention relates to a panda-type polarization-maintaining optical fiber used in the fields of optical fiber guidance and optical fiber sensing. Through the optimized design of the polarization-maintaining optical fiber, it can be applied in the field of high-precision sensing. Background technique [0002] Fiber optic gyroscope is a new type of sensor that uses optical fiber sensing technology to measure the inertial rotation rate in space. It has developed into a new mainstream instrument with epoch-making characteristics in the field of inertial technology. Compared with the commonly used mechanical gyroscope and the laser gyroscope developed in recent years , with higher precision, low cost, small size and light weight. The application prospect of fiber optic gyroscope is very broad. It is not only used for the navigation of aircraft and ships, missile guidance, and high-precision position control of spacecraft, but also can be used in the guid...

AI Technical Summary

Problems solved by technology

However, the increase in the area of ​​the stress zone will lead to a decrease in the mechanical properties of the polarization maintaining fiber, and will reduce the temperature stability and the consistency of the end face of the polarization maintaining fiber; at the same time, the increase in the area of ​​the stress zone and the increase in the doping amount of the stress zone , will bring greater process difficulty to the manufacture of stress rods and reduce the yield of stress rods

Images