Electro-optical crystal based quick polarization control method

Abstract

The invention discloses an electro-optical crystal based quick polarization control method, which is characterized by comprising a feedback control circuit composed of a polarization control module, a DSP module and a voltage amplification module, wherein the polarization control module comprises an electro-optical crystal array, a polarization-maintaining beam splitter and a polarization detector. A controlled light path is input into the polarization control module and is subjected to beam splitting by the polarization-maintaining beam splitter after passing through the electro-optical crystal array, wherein 95% of the light is output and the rest 5% is output to the polarization detector, after detection, four-way analog voltage related to polarization state is output and is sampled and operated by the DSP module, the DSP module outputs four-way analog voltage for controlling the electro-optical crystal array, the four-way analog voltage is loaded on the electro-optical crystal array in the polarization control module after being amplified by the voltage amplification module, and the polarization state of the controlled light path is changed, thus realizing polarization control. The feedback control speed and the accuracy of the polarization control method of the invention are superior to the feedback control speed and the accuracy of the traditional control methods.

Description

technical field [0001] The invention relates to a polarization control method in the field of optical communication, in particular to a fast polarization control method based on electro-optic crystals. Background technique [0002] Polarization-mode dispersion (PMD) in optical fibers, polarization-dependent modulation (PDM) in electro-optic modulators, and polarization-dependent gain (PDG) in optical amplifiers, etc., are a series of damages caused by polarization that restrict the increase in the transmission rate of optical communication networks. reason. Polarization Controller (PC for short) is a key component to overcome the polarization-related damage in the optical transmission system and monitor the polarization characteristics of the instrument. The polarization loss in the link is compensated by mechanical and optoelectronic methods. The main parameters of the polarization controller are response speed, extinction ratio, fluctuation, unprovoked reset, etc. [00...

AI Technical Summary

Problems solved by technology

However, since there is only one feedback parameter, it takes a long time to achieve the ideal control effect, and it cannot be used as a high-speed real-time optical polarization state control.

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