A liquid crystal wavelength selective switch

Abstract

The invention discloses a liquid crystal type wavelength selection switch. The liquid crystal type wavelength selection switch comprises a collimation input and output device (101), a polarizer beam splitting device (102), a beam expanding device (103), a spectro-grating (104), a focusing device (105) and a compensation type liquid crystal attenuation switching device (106) which are arrayed in sequence. The compensation type liquid crystal attenuation switching device (106) comprises a liquid crystal attenuation assembly (201), a liquid crystal switching assembly (202) and a reflector (203) and is characterized in that a metal bar assembly with the thermal expansion coefficient different from that of the reflector (203) is distributed and pasted on the reflector (203) in the long edge direction, the metal bar assembly deforms in a bending mode when the temperature changes to drive the curvature of the reflector (203) to change, and the face mirror shape for offsetting the change of an effective region of a liquid crystal chip is formed. Own temperature dependence of the liquid crystal chip is overcome, the temperature stability of a module is improved, and the measures are simple and easy to implement.

Description

technical field [0001] The invention relates to an optical communication device, in particular to a liquid crystal wavelength selective switch, belonging to the field of optical communication. Background technique [0002] The current wavelength selective switch mainly has the following three implementation forms: MEMS-based, LCOS-based and liquid crystal-based. Among them, the liquid crystal-based wavelength selective switch is favored due to its advantages of good stability, mature technology, and low cost. . [0003] The liquid crystal-based wavelength selective switch includes a core device—the liquid crystal attenuation switching device, which is used to realize the selection of the output port and the adjustment of the output optical power. The device comprises one layer of liquid crystal chips for attenuation and one or more layers of liquid crystal chips for switching. In view of the characteristics of the manufacturing process of the liquid crystal chip, the liqui...

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Problems solved by technology

This feature will cause the focal length of the optical system to change with temperature, and the liquid crystal chip is a slender strip, and the impact of its unevenness on the focal length of the optical path is mainly reflected in the short side direction, that is, the port switching direction. Therefore, when the temperature changes, the system's Indexes such as insertion loss and port spacing will change accordingly, which will cause the temperature stability of the module to deteriorate

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