Non-line-of-sight methodology for high-speed wireless optical communication in highly turbid water
Ng, Tien Khee
Ooi, Boon S.
KAUST DepartmentElectrical Engineering Program
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
King Abdullah University of Science and Technology (KAUST), Photonics Laboratory, Thuwal 21534, Saudi Arabia
Materials Science and Engineering Program
Online Publication Date2020-01-08
Print Publication Date2020-04
Permanent link to this recordhttp://hdl.handle.net/10754/660961
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AbstractUnderwater wireless optical communication (UWOC) is an emerging technology for discovering, exploiting, and protecting various underwater resources. Due to the diverse water clarity conditions, light signals are expected to propagate in a fashion dominated by the line-of-sight (LOS) to non-line-of-sight (NLOS) regime. To fully benefit from the high capacity underwater internet that UWOC could offer, especially in the presence of turbid water, a system that obviates the stringent requirements for pointing, acquisition, and tracking (PAT) is required. Herein, we demonstrated a robust NLOS UWOC link fully relieving the requirement on PAT. Based on a system design consisting of an ultraviolet (UV) laser for enhanced light scattering and a high sensitivity photomultiplier tube (PMT), we established an NLOS link with a data rate of 85 Mbit/s and a transmission distance of 30 cm using on-off keying (OOK) in emulated highly turbid harbor water. Further, a data rate of 72 Mbit/s is still achieved when the alignment is totally lost, i.e., the pointing directions of the transmitter and receiver are parallel. A longer transmission distance up to 40 m is also envisaged. Our findings will pave the way for a practical, short-reach, NLOS UWOC link in realistic oceanic scenarios.
CitationSun, X., Kong, M., Alkhazragi, O., Shen, C., Ooi, E.-N., Zhang, X., … Ooi, B. S. (2020). Non-line-of-sight methodology for high-speed wireless optical communication in highly turbid water. Optics Communications, 125264. doi:10.1016/j.optcom.2020.125264
SponsorsWe gratefully acknowledge the personnel at KAUST for their relentless support of this work: Dr. Virginia Unkefer and Mr. Heno Hwang at the Publication Services and Researcher Support Department; Mr. Muhammad Q. Popalzai, Mr. Meshal M. Abdulkareem, and Mr. Michael Bayudan from the Central Workshop. Figure 1 was created by Heno Hwang, scientific illustrator at KAUST.
Funding: This work was supported by King Abdullah University of Science and Technology (KAUST) [BAS/1/1614-01-01, KCR/1/2081-01-01, and GEN/1/6607-01-01].