Phase-type polarization controller

Abstract

The invention discloses a phase-type polarization controller, which belongs to the field of optical fiber communication. The phase-type polarization controller comprises an input fiber, an output fiber and a drive circuit, and is characterized in that the phase-type polarization controller consists of three-stage continuous adjustable phase shifters in cascade, wherein the continuous adjustable phase shifter comprises two parallel polarization beam splitters having a birefringence fast axis and a birefringence slow axis in the same direction, and two total reflection prisms arranged on the same ends of the two polarization beam splitters in parallel; the inclined planes of the two total reflection prisms are parallel to the end faces of the two polarization beam splitter; and one total reflection prism is fixed on a piezoelectric ceramic. For the first-stage continuous adjustable phase shifter and the second-stage continuous adjustable phase shifter, the birefringence fast axis and the total reflection prism simultaneously rotate by 45 degree or 135 degree through taking the light beam as the shaft; and the birefringence fast axis and the total reflection prism of the third-stage continuous adjustable phase shifter have the same direction or rotate by 90 degree. The piezoelectric ceramics of the three-stage continuous adjustable phase shifters are controlled by the drive circuit to achieve the conversion from an arbitrary determined input polarization state to an arbitrary determined polarization state. The phase-type polarization controller has fast response and high accuracy.

Description

Technical field: [0001] The invention belongs to the field of optical fiber communication. Background technique: [0002] The optical polarization controller is a device used to arbitrarily change the polarization state of light. It plays a very important role in the fields of high-speed optical fiber communication, coherent optical fiber communication and optical fiber sensing. The polarization controller can be used in the polarization mode dispersion compensation system to realize the compensation of the polarization mode dispersion in the high-speed optical fiber communication system above 10Gb / s. In a coherent optical communication system, a polarization controller is required to perform arbitrary conversion of the polarization state of the local oscillation probe light to achieve polarization matching with the incident signal light. [0003] The existing polarization controllers mainly include fiber extrusion / winding type, wave plate rotation type, liquid crystal / electro-op...

AI Technical Summary

Problems solved by technology

The waveguide type polarization controller has a fast response speed, but the insertion loss is large

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