Chinese Optics Letters, 2019, 17 (10): 100004, Published Online: Sep. 29, 2019
50 Gb/s PAM4 underwater wireless optical communication systems across the water–air–water interface [Invited]
010.3310 Laser beam transmission 010.7340 Water 060.4510 Optical communications 140.7300 Visible lasers
Abstract
A 50 Gb/s four-level pulse amplitude modulation (PAM4) underwater wireless optical communication (UWOC) system across the water–air–water interface is demonstrated in practice. In practical scenarios, laser beam misalignment due to oceanic turbulence degrades performance in UWOC systems. With the adoption of a reflective spatial light modulator (SLM) with an electrical controller, not only can the laser be arbitrarily adjusted to attain a water–air–water scenario, but oceanic engineering problems can also be resolved to establish a reliable UWOC link. Brilliant bit error rate performance and clear PAM4 eye diagrams are attained by adopting a Keplerian beam expander and a reflective SLM with an electrical controller. This proposed PAM4 UWOC system presents a feasible state that outperforms existing UWOC systems due to its feature providing a high-speed water–air–water link.
Chung-Yi Li, Hai-Han Lu, Yong-Cheng Huang, Qi-Ping Huang, Jing-Yan Xie, Song-En Tsai. 50 Gb/s PAM4 underwater wireless optical communication systems across the water–air–water interface [Invited][J]. Chinese Optics Letters, 2019, 17(10): 100004.