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A method to realize precise adjustment of extinction ratio

A technology of extinction ratio and magnitude, applied in the direction of testing optical properties, etc., can solve the problems of unstable magnitude, difficulty in ensuring the accuracy and repeatability of angular rotation, and high requirements on angular rotation accuracy, and achieves simple and portable structure. The effect of calibration

Active Publication Date: 2017-01-04
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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  • A method to realize precise adjustment of extinction ratio

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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 accurately adjusting the magnitude of the extinction ratio. Starting from the parameter definition of the extinction ratio, different magnitudes of the extinction ratio are realized by changing the power of two beams of orthogonally polarized light. The working principle is: use a polarizing 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. By adopting the above solution and using the principle of polarization beam splitting / combining, the control of two paths of orthogonally polarized light is realized, and the purpose of adjusting the value of the extinction ratio is achieved by adjusting the power of the two paths of 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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