Bidirectional four-beam liquid crystal optical phased-array antenna and multi-user communication method thereof

Abstract

The invention provides a bidirectional four-beam liquid crystal optical phased-array antenna and realizes a liquid crystal phased multi-user space bidirectional laser communication method based on the antenna. According to the antenna, large-angle deflection control is performed by adopting the combination of a transmission type liquid crystal polarization grating and a transmission type liquid crystal optical phased array, so as to realize beam scanning, and high-precision beam deflection control is performed through liquid crystal optical wedge control beams, so as to realize high-precision beam tracking. According to the bidirectional four-beam liquid crystal optical phased-array antenna and the liquid crystal phased multi-user space bidirectional laser communication method, linearly polarized beams of which two polarization directions are mutually perpendicular are independently controlled by adopting two parallel liquid crystal optical phased-array antennae, and receiving and sending separation of the same user optical signal is realized by adopting a circular polarization right-and-left spin multiplexing and liquid crystal optical phase combined method, so that multiuser bidirectional communication can be realized, and single-user polarization multiplexing communication also can be realized.

Description

technical field [0001] The invention relates to the technical fields of satellite laser communication and laser radar, and in particular to a bidirectional four-beam liquid crystal optical phased array antenna and a liquid crystal phase controlled multi-user space bidirectional laser communication method realized by the antenna. Background technique [0002] In recent years, space laser communication technology has developed rapidly, and foreign countries have successfully established inter-satellite and satellite-ground high-speed laser communication demonstration verification systems. With the development of space laser communication technology, the inter-satellite laser communication link is developing into a space laser communication network, which requires communication between one user and multiple users. At present, the laser communication system researched at home and abroad is a point-to-point single-link data transmission system, which uses a mechanical tracking me...

AI Technical Summary

Problems solved by technology

At present, the laser communication system researched at home and abroad is a point-to-point single-link data transmission system, which uses a mechanical tracking mechanism and traditional tracking technology. The mechanical tracking mechanism (including the antenna) is bulky, heavy, and has a large inertia. Meet the volume and weight requirements of the platform, and it is difficult to achieve multi-user access

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