Mr. Bin Hu Profile

Bin Hu

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Proceedings Article | 5 November 2020 Paper

Feature of spaceborne laser communication telescope isolation

Dong-liang Shi, Rui-min Fu, Jian-feng Liu, Bin Hu

Proceedings Volume 11562, 115620R (2020) https://doi.org/10.1117/12.2579659

KEYWORDS: Mirrors, Telescopes, Laser communications, Reflectivity, Off axis mirrors, Reflector telescopes, Optical telescopes, Reflection, Bidirectional reflectance transmission function

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Spacebornelaser communication system utilize laser to transfer information, which can realize star to star, star to earth communication. It hasthe advantage of wide bandwidth, high anti-jamming capability, good secrecy performance, small size and weight, and lower power dissipation. Laser communication telescope, which is use for laser beam alignment, is the main part of spaceborne laser communication system to realize long distance transmission. As transmit-receive integration is the mainstream form of spaceborne laser communication system in current, isolation become a kernel index which determined the signal-to-noise ratio and transmission distance. Optical telescope of coaxial two-mirrorreflective structure and off-axis three mirror reflective structure were built, and stay light analysis was done on both kind of laser communication telescope to get the isolation. The results show that the isolation of coaxial two-mirror reflective optical telescope is 62dB and the isolation of off-axis three mirror optical telescope is 70dB. Furthermore, the results show that mirror scatter is the dominant influence factor of isolation. Through comparative analysis of two forms of optical system, under the same condition, off-axis three mirror optical telescope has a better performance in isolation.

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