Compared to conventional modes of microwave communication technology, laser-based space communication technology utilizes lasers for information transmission, featuring a large bandwidth, low power consumption, small size and high confidentiality. Notably, low earth orbit (LEO) satellites have been employed for commercial networking endeavors, such as Starlink and OneWeb, on a large scale owing to its benefits in terms of low orbital height, short transmission delay, low spatial path loss, and low launch cost. Therefore, satellite communication holds significant commercial value. As a complementary technology to augment the network capability of terrestrial communication systems, satellite communication is advantageous terms of broad coverage, long transmission distance, and agile networking capabilities, rendering a near-seamless coverage for regions such as oceans, mountains, and plateaus, while catering to the demands of various users for communication coverage. In recent years, with the growth of terrestrial communication technology, free-space optical communication has been given more attention due to its advantages such as a wide bandwidth, high speed, high data rates, and low latency. Moreover, by leveraging a fast filtering algorithm a considerable amount of resource consumption is saved in its engineering implementation, and its sensitivity can be significantly enhanced via a high-speed parallel error-correction codec based on low-density parity-check technology. As coherent demodulation will be affected by considering the Doppler shift effect in digital demodulation, Doppler shift of ± GHz can be compensated by adopting a two-stage frequency offset compensation. This study investigates a digital coherent transceiver, based on binary phase-shift keying technology. The current generation of mainstream communication systems are classified as coherent systems and incoherent systems, and in particular, coherent systems have received more attention owing to their high receiving sensitivity. Catering to these interests, optical communication presents possible ways of larger bandwidth than microwave communication. The deployment of low earth orbits is seen as a promising way of enlarging data capacities as well as high data rates. 2University of Chinese Academy of Sciences, Beijing, China.1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences, Xi’an, China.Jiacheng Meng 1,2* †, Tingting Wei 1 †, Yufei Wang 1, Zhaofeng Bai 1,2, Junxia Wu 1, Duorui Gao 1,2, Zhuang Xie 2, Yunqiang Zheng 1, Wenchao Nie 1, Sentao Wei 1, Wei Wang 1,2* and Xiaoping Xie 1,2*
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