Ultraviolet-to-blue color-converting scintillating-fibers photoreceiver for 375-nm laser-based underwater wireless optical communication

Abstract
Underwater wireless optical communication (UWOC) can offer reliable and secure connectivity for enabling future internet-of-underwater-things (IoUT), owing to its unlicensed spectrum and high transmission speed. However, a critical bottleneck lies in the strict requirement of pointing, acquisition, and tracking (PAT), for effective recovery of modulated optical signals at the receiver end. A large-area, high bandwidth, and wide-angle-of-view photoreceiver is therefore crucial for establishing a high-speed yet reliable communication link under non-directional pointing in a turbulent underwater environment. In this work, we demonstrated a large-area, of up to a few tens of cm2, photoreceiver design based on ultraviolet(UV)-to-blue color-converting plastic scintillating fibers, and yet offering high 3-dB bandwidth of up to 86.13 MHz. Tapping on the large modulation bandwidth, we demonstrated a high data rate of 250 Mbps at bit-error ratio (BER) of 2.2 × 10−3 using non-return-to-zero on-off keying (NRZ-OOK) pseudorandom binary sequence (PRBS) 210-1 data stream, a 375-nm laser-based communication link over the 1.15-m water channel. This proof-of-concept demonstration opens the pathway for revolutionizing the photodetection scheme in UWOC, and for non-line-of-sight (NLOS) free-space optical communication.

Citation
Kang, C. H., Trichili, A., Alkhazragi, O., Zhang, H., Subedi, R. C., Guo, Y., … Ooi, B. S. (2019). Ultraviolet-to-blue color-converting scintillating-fibers photoreceiver for 375-nm laser-based underwater wireless optical communication. Optics Express, 27(21), 30450. doi:10.1364/oe.27.030450

Acknowledgements
King Abdullah University of Science and Technology (BAS/1/1614-01-01, GEN/1/6607-01-01,KCR/1/2081-01-01); KAUST-KFUPM Special Initiative (REP/1/2878-01-01); King Abdulaziz City for Science and Technology (KACST TIC R2-FP-008).

Publisher
The Optical Society

Journal
Optics Express

DOI
10.1364/oe.27.030450

Additional Links
https://www.osapublishing.org/abstract.cfm?URI=oe-27-21-30450

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