Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application

Abstract

A method for setting axle of polarization shaft on polarization preserving fiber based on side view light intensity distribution includes regulating distance between said fiber and objective to let light intensity distribution present nine characteristic points, rotating said fiber to obtain light intensity characteristic amounts at different position angle and to obtain measurement curve of angle variation in following to light intensity characteristic amounts, making cross - correlation of measurement curve with standard curve and using angle corresponding to maximum value of cross - correlation as position angle of said fiber.

Description

technical field [0001] The invention relates to a high-precision axis-fixing method of the polarization axis of a polarization-maintaining optical fiber based on five-finger side-view light intensity distribution and its application. Background technique [0002] Polarization-maintaining optical fiber has important applications in the fields of interferometric optical fiber sensor production, coherent optical fiber communication, and optical fiber gyroscope because it can maintain a specific polarization state transmitted in the optical fiber. The reason why the polarization maintaining fiber can keep the polarization characteristics of the specific polarized light transmitted in the fiber core is unchanged. The common method is to artificially design the fiber core of this type of fiber to be subjected to asymmetric stress, so that the stress formed in the fiber core double refraction. The usual way to achieve this design is to set different stress...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem that the existing technology of polarization-maintaining optical fiber polarization axis alignment cannot meet the production requirements of polarization-maintaining optical fiber devices, the primary purpose of the present invention is to provide a high-precision alignment of polarization-maintaining optical fiber based on side-view light intensity distribution method, the light intensity distribution profile curve of the side view image described in the method presents a "five-finger" distribution, which is called "five-finger light intensity distribution curve", and the center of the "five-finger light intensity distribution curve" has Five peaks, four troughs, a total of nine feature points

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