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Method for realizing accurate adjustment of extinction ratio measurement value

A technology of extinction ratio and magnitude, applied in the direction of testing optical performance, etc., can solve the problems of difficulty in ensuring the accuracy and repeatability of angular rotation, unstable magnitude, and high requirements on angular rotation accuracy, achieving easy on-site calibration and simple structure. Portable effect

Active Publication Date: 2015-01-14
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

This method uses spatial optical devices to solve the problem of unstable values, but it requires high accuracy of angle rotation, while the resolution of conventional angle rotation disks is only 2°, and it is difficult to ensure the accuracy of angle rotation through manual rotation. Accuracy and Repeatability

Method used

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  • Method for realizing accurate adjustment of extinction ratio measurement value

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Embodiment 1

[0021] The present invention starts from the parameter definition of extinction ratio, and realizes different extinction ratio values ​​by changing the power of two beams of orthogonally polarized light. The working principle is: use a polarization beam splitter to split the input light into two orthogonal linearly polarized lights, attenuate the optical power of one of them, and then combine the two paths of light through a polarization beam combiner, so that through the control The attenuation of the attenuator can realize the adjustable value of the extinction ratio.

[0022] The specific implementation process is as figure 1 As shown, the light emitted by the broadband light source 101 passes through the polarization beam splitter 102 and is divided into two paths of orthogonally polarized light, wherein the optical power of one path is P 1 The polarized light is input to one input end of the polarization beam combiner 104, and the other optical power is P 2 After the po...

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Abstract

The invention provides a method for realizing accurate adjustment of an extinction ratio measurement value. Based on a parameter definition of an extinction ratio, different extinction ratio measurement values are achieved by changing powers of two beams of orthogonal polarized light. According to the working principle, input light is divided by a polarization beam splitter into two beams of orthogonal polarized light, the power of one path of light is attenuated, then the two paths of light are combined through a polarization beam combiner, and therefore adjustment of the extinction ratio measurement value can be achieved by controlling the attenuation amount of an attenuator. By means of the technical scheme, the method for realizing accurate adjustment of the extinction ratio measurement value realizes control over the two paths of orthogonal polarized light by utilizing the polarization beam splitting / combining principle, and achieves the purpose of adjustment of the extinction ratio measurement value by adjusting the power of the two paths of orthogonal polarized light.

Description

technical field [0001] The invention belongs to the technical field of calibration of an extinction ratio tester, and in particular relates to a method for realizing precise adjustment of an extinction ratio value. Background technique [0002] The extinction ratio tester is an instrument for testing the extinction ratio parameters of polarization-maintaining optical fibers and polarization devices. There is also an increasing need to perform metrological calibrations. The working principle of the extinction ratio tester is to use the rotating polarization analysis method. The light emitted by the polarized light source passes through the polarization-maintaining fiber and then reaches the polarization analyzer. The maximum value and minimum value of the polarized light power, and then perform data processing according to the calculation formula of the extinction ratio, and display the measured value of the extinction ratio. [0003] At present, there are two calibration m...

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Application Information

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IPC IPC(8): G01M11/02
Inventor 赵耀李国超郑光金高业胜
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP