Method for testing polarization degree of light scrambled by light scrambler

Abstract

The invention discloses a method for testing the polarization degree of light scrambled by a light scrambler, and belongs to the technical field of optical measurement. In the prior art, a polarization state analyzer is used, the polarization degree of light scrambled by a light scrambler is approximately obtained through a polarization degree formula, and the method needs expensive instruments and is complex in system. The method of the invention comprises the following steps: sequentially connecting a polarization-maintaining light source, a polarization controller, a to-be-measured opticalscrambler, an analyzer and an optical power meter by using a single-mode optical fiber jumper; generating complete polarized light with a stable polarization state by the polarization-maintaining light source; adjusting the polarization controller by using an upper computer to enable the polarization state of light output by the polarization controller to be S1; adjusting the average time of the testing process of the optical power meter to t1; adjusting the angle of the polarization analyzer to 360 degrees from 0 degree by using the upper computer, adjusting the stepping to 2 degrees, recording the light intensity value in real time in the adjusting process, and solving the maximum light intensity Pmax and the minimum light intensity Pmin; when the average time is t1 and the input polarization state light is S1, obtaining the polarization degree of the light scrambled by the to-be-measured light scrambler.

Description

technical field [0001] The invention relates to a method for testing the degree of polarization of light scrambled by an optical scrambler, and belongs to the technical field of optical measurement. Background technique [0002] The optical polarization scrambler can quickly change the polarization state of the input light, generate a random polarization state, and eliminate the influence of the polarization state disturbance of the input light on the test within a period of time. It is widely used in long-distance optical communication, high-speed optical communication, and fiber optic sensing. . For example, in a long-distance optical fiber communication system, the optical scrambler can be used to reduce the polarization hole burning phenomenon of the fiber amplifier and improve the signal-to-noise ratio of signal transmission. The better the suppression effect of the polarization hole burning phenomenon; in the process of testing the polarization characteristics of high...

AI Technical Summary

Problems solved by technology

[0005] The degree of polarization of the light after scrambling is the core index of the optical scrambler, which characterizes the polarization effect of the optical scrambler. There are many methods for testing the degree of polarization of light, such as the polarization scrambling method and the extreme value search method. , but the fully polarized light is still fully polarized after passing through the optical polarizer, so no matter how the polarization effect is, the test DOP is 1, and the conventional method cannot test the degree of polarization of the light after the optical polarization scrambler

For the optical polarizer produced by the enterprise, the polarization degree test of the scrambled light generally uses a polarization analyzer to test the Stokes parameters of the light to be measured at multiple time points within a period of time, and then the acquired Stokes parameters Kex parameters are averaged, and the polarization degree of the light scrambled by the optical polarizer is approximated by the polarization degree formula, but the polarization state analyzer system is complex and expensive, which makes this method costly to use, which is not conducive to popularization

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