Method and device for generating intensity-controllable weak polarization coupling points in polarization-maintaining fiber by ultraviolet exposure

Abstract

The invention provides a method and a device for generating weak polarization coupling points with controllable strengths in a polarization maintaining optical fiber of ultraviolet exposure. By adjusting the exposure angle of ultraviolet, the length of an exposure fiber and the refractive rate modulation depth, non-symmetrical refractive rate modulation of the polarization maintaining optical fiber is achieved, so weak polarization coupling points with controllable strengths are generated. The device comprises a KrF laser, a polarization maintaining optical fiber, a rotary fiber function clamp and a fiber feature shaft monitoring device. The method and the device are characterized in that through the weak polarization coupling points with controllable strengths, light loss caused by coupling can be reduced; signal interference between interferometers is reduced; simultaneous effective detection of multiple coupling points is achieved; by use of the weak polarization coupling points, cascading interferometers can be achieved; by writing optical grating in the polarization maintaining optical fiber and generating weak polarization coupling, construction of a cascading polarization maintaining optical fiber optical grating and construction of an optical fiber interferometer reusable multifunctional sensor network based on the generated polarization coupling points are facilitated.

Description

technical field [0001] The invention relates to a method for producing intensity-controllable weak polarization coupling points by using ultraviolet exposure. The invention also relates to a device for generating intensity-controllable weak polarization coupling points by ultraviolet exposure. Background technique [0002] Polarization-maintaining fiber is a fiber whose polarization state remains almost unchanged in a long fiber when polarized light is transmitted in the fiber. When it is affected by external factors, the polarization-maintaining fiber is transmitted along a certain optical axis. Polarized light will couple to another optical axis to form polarization mode energy coupling phenomenon. Nowadays, a variety of detection principles and schemes have been used for polarization coupling testing. The common goal of various schemes is to effectively detect the polarization coupling phenomenon in the polarization maintaining fiber, measure the spatial distribution of ...

AI Technical Summary

Problems solved by technology

The technical solutions involved in these two patent documents only propose innovations for the measurement and demodulation methods of the polarization coupling of polarization-maintaining fibers, and do not involve the research on the controllable polarization coupling

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