OTDR-based photonic crystal fiber ring fusing point reflection intensity determining method

Abstract

The invention provides an OTDR-based photonic crystal fiber ring fusing point reflection intensity determining method. By fusing polarization maintaining optical fibers to two sides of a photonic crystal fiber and measuring the fusion point back reflection from the polarization maintaining optical fiber on one side by using an OTDR, back reflection of fusion points in a photonic crystal fiber ringcan be simulated, disturbance of gyro signal light to measurement can be suppressed, and independent measurement of back reflection can be realized. For solving the problem of low measurement precision of the OTDR, a non-fusion end face of the polarization maintaining optical fiber on the other side is cut to obtain an optical fiber cleavage surface perpendicular to the light transmission direction, and the surface becomes a Fresnel reflection surface which enables the back reflection intensity to be calculated accurately. With the back reflection light intensity relative ratio of the opticalfiber fusion points and the Fresnel reflection surface obtained from an OTDR measuring curve and the calculated absolute reflection intensity of the Fresnel reflection surface, the fusion point backreflection intensity can be obtained accurately. The method solves the problem that the fusion point back reflection intensity in a photonic crystal fiber ring cannot be measured and is high in measurement accuracy.

Description

technical field [0001] The invention relates to an OTDR-based method for determining the back reflection of the melting point of the photonic crystal fiber gyroscope fiber ring, which can realize the accurate measurement of the back reflection light intensity at the melting point of the photonic crystal fiber and the waveguide tail fiber in the photonic crystal fiber gyroscope, and belongs to the photonic crystal fiber Gyro technology field. Background technique [0002] Fiber optic gyroscopes have been widely used in space systems due to their all-solid-state, high-reliability, and high-precision characteristics. However, there is strong radiation in the space environment, and the rapid decline in performance and reliability of traditional optical fibers after irradiation seriously restricts the application of fiber optic gyroscopes. As a new type of material, photonic crystal fiber has substantially improved radiation resistance compared with ordinary fiber, and has the p...

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is: to overcome the deficiency that the prior art cannot measure the back reflection light intensity of the melting point in the photonic crystal fiber optic gyroscope, and propose a method for determining the back reflection intensity of the melting point of the optical fiber ring of the photonic crystal fiber gyroscope based on OTDR

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