Experiment analysis on optimization of 7 km urban space laser communication link

Abstract

In this paper, multi-aperture transmission technology and bit-interleaved coded modulation techniques are used to optimize the space optical link from the aspects of laser communication optical transceivers and communication coding modulation. Through the experiment, it is concluded that in the 7 km complex urban link, the use of multi-aperture transmission technology can effectively alleviate the channel fading caused by atmospheric turbulence, thereby reducing the scintillation of light intensity and improving the communication effect. Compared to non-coding modulation, the entire communication link can be optimized using bit-interleaved coded modulation techniques. When the light intensity scintillation is less than 0.25, the communication bit error rate will be reduced by 1 to 3 orders of magnitude. These technologies can effectively improve the performance of space optical communication, optimize the complete three-dimensional communication network system such as air and ground, ground and ground, etc., and realize rapid transmission of information. It is used in the connection of local area networks, temporary deployment in special environments and emergency disaster relief, etc., and provides some technical and data support for complex space optical communication fields.