800  Gb/s/200  m FSO link with a WDM-PAM4 scheme and SLM-based beam tracking technology

An 800 Gb/s/200 m free-space optical (FSO) link with a wavelength-division multiplexing (WDM)-four-level pulse amplitude modulation (PAM4) scheme and spatial light modulator (SLM)-based beam tracking technology is constructed. To the best of our knowledge, this is the first one that adopts a WDM-PAM...

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Published inOptics letters Vol. 46; no. 6; p. 1269
Main Authors Lu, Hai-Han, Huang, Xu-Hong, Tsai, Wen-Shing, Feng, Chao-Yu, Chou, Cing-Ru, Chen, Yi-Hao, Huang, Yu-Ting, Nainggolan, Agustina
Format Journal Article
LanguageEnglish
Published United States 15.03.2021
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Summary:An 800 Gb/s/200 m free-space optical (FSO) link with a wavelength-division multiplexing (WDM)-four-level pulse amplitude modulation (PAM4) scheme and spatial light modulator (SLM)-based beam tracking technology is constructed. To the best of our knowledge, this is the first one that adopts a WDM-PAM4 scheme and an SLM-based beam tracking technology to simultaneously afford a high transmission capacity of 800 Gb/s and resolve the laser beam misalignment problem due to target device movement. By adopting a 16-wavelength WDM-PAM4 scheme, the transmission capacity of the FSO link is considerably enhanced with an 800 Gb/s (50 / 4/ ×16 ) total capacity. By deploying an SLM-based beam tracking technology, the laser beam misalignment problem is practically resolved for providing an FSO link with high link accessibility. This demonstrated WDM-PAM4 FSO link fully meets the requirements of high-speed, long-reach, and high-reliability transmissions.
ISSN:1539-4794
DOI:10.1364/OL.418822