Control method used for controlling polarization stability of dual-wavelength orthogonal polarized light

Abstract

Provided is a control method used for controlling the polarization stability of dual-wavelength orthogonal polarized light. According to the scheme, the method comprises the steps that (1), a reference partial direction is set; (2), the current partial direction of the dual-wavelength orthogonal polarized light and the reference partial direction are compared in real time, and the included angle alpha of the current partial direction of the dual-wavelength orthogonal polarized light and the reference partial direction is calculated; (3), according to the included angle alpha, the partial direction of the dual-wavelength orthogonal polarized light is adjusted through a polarization controller, and the included angle alpha is made to be decreased; (4), the step (2) and the step (3) are carried out repeatedly, and the numerical value of the included angle alpha is made to converge to be zero. The control method has the advantage of being suitable for controlling the polarization stability of the dual-wavelength orthogonal polarized light.

Description

technical field [0001] The invention relates to a polarization control technology, in particular to a control method for controlling polarization stability of dual-wavelength orthogonally polarized light. Background technique [0002] The polarization state of light is one of the four key parameters of light (frequency, phase, amplitude, and polarization state). Due to the influence of environmental temperature, stress and other factors, the change of polarization state has a great impact on the field of high-speed optical communication, optical sensing and some special polarization-related devices. [0003] In the field of high-speed optical communication, polarization-dependent modulation, polarization-dependent amplification gain, and polarization multiplexing that have emerged in recent years all require optical signals to have a stable polarization state during transmission, so polarization control plays an extremely important role; another On the one hand, with the br...

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Problems solved by technology

[0005] Existing polarization control methods are only suitable for controlling single-wavelength and single-polarized light. The fundamental reason is that existing polarization control methods need to rely on optical power to obtain polarization errors. Polarization relationship, the optical power of the optical signal output by the polarizer will not change with the polarization of the orthogonally polarized light, so it is impossible to rely on optical power detection to obtain the polarization error amount, and naturally it is impossible to realize the polarization state. stability control

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