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Polarization stabilizing type polarization controller, power stabilizing method and polarization state adjusting method

A polarization controller and polarization state technology, which is applied in instruments, nonlinear optics, optics, etc., can solve the problems such as the inability of optical signals to eliminate random noise, the adverse effect of signal-to-noise ratio, and the difficulty of terminal detection of optical signals. The effect of noise ratio, maintaining stable bias, and efficient bias stabilization

Pending Publication Date: 2021-10-29
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

[0004] The existing polarization-stabilizing polarization controllers mainly have the following problems: 1) The existing technology uses the real-time test results of the polarization state as the feedback guidance, which is limited by the speed and accuracy of the polarization state test, the polarization control algorithm and other factors. When the fluctuation amplitude or frequency of the polarization state of the input light is large, the polarization state of the output light can only remain relatively stable within a specific interval; 2) For fiber optic systems with strong polarization sensitivity, random fluctuations in the polarization state within a specific interval It is difficult to quantify the impact on the optical signal detected by the terminal, adding random noise that cannot be eliminated to the optical signal, and adversely affecting the signal-to-noise ratio

Method used

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  • Polarization stabilizing type polarization controller, power stabilizing method and polarization state adjusting method

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Embodiment 1

[0028] Such as figure 2 As shown, one embodiment of the present invention is that the present invention proposes a novel polarization-stabilizing polarization controller: comprising a first collimator 1, a first polarization state control unit 2, a polarizer 3, and a beam splitter 4. A second polarization state control unit 5 , a second collimator 6 , a photodetector 7 , a first cable 8 , a controller 9 , a second cable 10 , and a third cable 11 . The output light of the external optical fiber becomes the controller through the first collimator 1, passes through the first polarization state control unit 2 and the polarizer 3 in turn, enters the beam splitter 4, and is divided into two paths, one of which passes through the second polarization state in turn. The state control unit 5, the second collimator 6 is connected to the external output; the other light enters the photodetector 7, and the controller 9 communicates with the photodetector respectively through the first cab...

Embodiment 2

[0047] On the basis of the above content, the overall workflow of a novel polarization-stabilizing polarization controller, power stabilization method and polarization state adjustment method of the present invention is as follows:

[0048] 1. When the polarization-stabilized polarization controls the external input optical signal, the polarizer 3 locks the external input light into the online polarized light to maintain the polarization state of the output light;

[0049] 2. When the optical signal is collected by the photodetector 7, when the polarization state of the input light is unstable, the optical signal will fluctuate up and down within a certain range at this time;

[0050] 3. Decreasing the maximum optical signal power collected by the photodetector 7 by 0.5dB as the reference optical power;

[0051] 4. The controller 9 continuously applies different electric control signals to the first polarization state control unit, so that the power collected by the photodetec...

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Abstract

The invention provides a polarization stabilizing type polarization controller, a power stabilizing method and a polarization state adjusting method. The controller is characterized in that light output by an external optical fiber is changed into control light through a first collimator, sequentially passes through a first polarization state control unit and a polarizer, enters a beam splitter and then is divided into two paths, one path of the light sequentially passes through a second polarization state control unit and a second collimator to be connected with external output; and the other path of light enters a photoelectric detector, and the controller is connected with the photoelectric detector, the first polarization state control unit and the second polarization state control unit through a first cable, a second cable and a third cable respectively. The polarization state is maintained through the polarizer, the influence of factors such as large fluctuation amplitude or frequency of the polarization state of the input light can be overcome without any operation, efficient stable polarization is maintained, and the problem that the polarization state can only be maintained in a specific interval in the prior art can be solved.

Description

technical field [0001] The invention belongs to the technical field of polarization controllers, and in particular relates to a novel polarization-stabilizing polarization controller, a power stabilization method and a polarization state adjustment method. Background technique [0002] The polarization-stabilizing polarization controller is a kind of polarization controller that is widely used in optical fiber technology, and has important applications in high-speed optical communication and high-precision optical fiber sensing technology. In fiber optic systems, polarization-stabilizing polarization controllers are generally used at the front end of terminal optical signal analysis components. The polarization state is adjusted and maintained. [0003] Such as figure 1 As shown, the existing polarization-stabilizing polarization controller is mainly composed of a polarization state control unit, a polarization state test unit, and a light splitting unit, such as figure 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G02F1/03G02F1/035
CPCG02F1/0136G02F1/0305G02F1/035
Inventor 李国超朱兴邦王少水孙庆旭
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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