Active feedback type polarization-maintaining optical fiber polarization stabilizing device and method

By employing an active feedback polarization-maintaining fiber polarization stabilization device and method, and utilizing a closed-loop feedback system and a normalized differential method for dual-path optical intensity signals, the problem of polarization state drift of output laser from polarization-maintaining fiber being susceptible to environmental disturbances has been solved. This achieves high-precision and stable polarization locking, which is applicable to fields such as cold atom, quantum optics, and precision measurement.

CN122284121APending Publication Date: 2026-06-26HEFEI NATIONAL LABORATORY +1
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Patent Information

Application Number
CN202610649784.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-12
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, the polarization state of laser output from polarization-maintaining fibers is easily affected by environmental disturbances and lacks high-precision real-time active compensation, resulting in unstable polarization state at the output end and affecting the contrast and stability of optical measurements.

Method used

An active feedback polarization-maintaining fiber polarization stabilization device is adopted. By combining the polarization compensation module at the input end and the polarization detection module at the output end with the signal processing and control module to form a closed-loop feedback system, an error signal is generated by normalizing the difference between the two optical intensity signals. This signal drives a rotatable half-wave plate to continuously adjust the polarization direction, thereby achieving the preset intrinsic axis of the polarization-maintaining fiber.

Benefits of technology

It achieves active compensation for temperature drift, mechanical vibration and long-term drift, improves the system's anti-interference ability and long-term operational stability, significantly improves the accuracy and reliability of polarization detection, and enhances the system's robustness and safety.

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Abstract

The invention discloses an active feedback type polarization-maintaining optical fiber polarization stabilizing device and method, and the method comprises the steps: a polarization compensation module is disposed in front of the input end of a polarization-maintaining optical fiber, and adjusts the linear polarization direction of incident laser; the polarization detection module is arranged behind the output end of the polarization maintaining optical fiber and converts output laser into multiple paths of light intensity signals related to the polarization state; the signal processing and control module is respectively connected with the polarization detection module and the polarization compensation module, generates a normalized differential error signal according to the multiple paths of light intensity signals, generates a control signal based on a difference value between the error signal and a target error signal value, and drives the polarization compensation module to adjust the linear polarization direction of the incident laser in a closed-loop manner so as to realize the polarization compensation of the incident laser. And continuously aligning the preset intrinsic axis of the polarization maintaining optical fiber. The optical power fluctuation interference is suppressed through the normalized differential error signal, and the initial calibration and closed-loop feedback control are combined, so that the polarization deviation caused by environmental disturbance, mechanical drift and long-term operation of the system can be compensated in real time, and the polarization stability of the output laser of the polarization maintaining optical fiber is improved.
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