IEEE Photonics Journal (Jan 2019)

256 Gb/s Four-Channel SDM-Based PAM4 FSO-UWOC Convergent System

  • Wen-Shing Tsai,
  • Chung-Yi Li,
  • Hai-Han Lu,
  • Yi-Feng Lu,
  • Shi-Cheng Tu,
  • Yong-Cheng Huang

DOI
https://doi.org/10.1109/JPHOT.2019.2900994
Journal volume & issue
Vol. 11, no. 2
pp. 1 – 8

Abstract

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Given the rising demand for free-space with underwater environmental monitoring, calamity precaution, and developed industry applications, a free-space optical (FSO)-underwater wireless optical communication (UWOC) convergence is constructed to be an attractive architecture for affording a high transmission capacity. A 256-Gb/s four-channel space-division-multiplexing (SDM)-based four-level pulse-amplitude modulation (PAM4) FSO-UWOC convergent system that exploits two-stage injection-locked red-light vertical-cavity surface-emitting laser transmitters is, thus, offered and practically demonstrated. With a four-channel SDM scheme and PAM4 modulation, the total transmission capacity is drastically enhanced to 256 Gb/s. To the best of our understanding, this architecture is the leading one to build a high-speed 256 Gb/s FSO-UWOC convergent system with competent performances. It directs an approach to expedite extensive applications in the integration of high-speed free-space with underwater links.

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