Recent trends in coherent free-space optical communications

Chao Zhang; Kota Uyama; Zheyuan Zhang; Lei Jin; Sze Yun Set; Shinji Yamashita

doi:10.1117/12.2582415

5 March 2021 Recent trends in coherent free-space optical communications

Chao Zhang, Kota Uyama, Zheyuan Zhang, Lei Jin, Sze Yun Set, Shinji Yamashita

Proceedings Volume 11712, Metro and Data Center Optical Networks and Short-Reach Links IV; 117120M (2021) https://doi.org/10.1117/12.2582415
Event: SPIE OPTO, 2021, Online Only

Abstract

Free-space optical communication is a line-of-sight wireless communication scheme, which is preferred for its number of prime advantages over radio frequency wireless communication, such as no spectrum licensing, large bandwidth, inherent security, electromagnetic compatibility/electromagnetic interference immunity etc. Moreover, free-space optical communication also benefits from low-cost installation and maintenance. It has been studied for the next generation access networks, inter-building connections, ground-to-unmanned aerial vehicle links, underwater communication applications, inter-satellite links, deep space links etc. Among various detection approaches utilized in free-space optical communication, coherent detection can achieve the best sensitivity in a bandwidth-limited condition, effectively demodulate optical multilevel coded signals to attain high spectral efficiency, offer excellent background noise rejection. However, such an attractive free-space optical communication suffer from waveform distortion, scintillation, phase fluctuations etc. after transmission in atmospheric channels. Its link losses are almost dependent on atmospheric effects and climatic conditions. In this article, we present an up-to-date survey on coherent free-space optical communication, the atmospheric turbulent effects especially the impacts of turbulence in free-space optical links, and countermeasures against such impairments.

Conference Presentation

Citation Download Citation

Chao Zhang, Kota Uyama, Zheyuan Zhang, Lei Jin, Sze Yun Set, and Shinji Yamashita "Recent trends in coherent free-space optical communications", Proc. SPIE 11712, Metro and Data Center Optical Networks and Short-Reach Links IV, 117120M (5 March 2021); https://doi.org/10.1117/12.2582415

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