Open AccessUnderwater wireless transmission of high-speed QAM-OFDM signals using a compact red-light laser
Author(s) -
Jing Xu,
Yuhang Song,
Xiangyu Yu,
Aobo Lin,
Meiwei Kong,
Jun Han,
Ning Deng
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.008097
Subject(s) - bit error rate , optics , orthogonal frequency division multiplexing , underwater , optical wireless , visible light communication , transmission (telecommunications) , physics , bandwidth (computing) , channel (broadcasting) , computer science , telecommunications , wireless , light emitting diode , oceanography , geology
We first study the transmission property of red light in water in terms of extinction coefficient and channel bandwidth via Monte Carlo simulation, with an interesting finding that red light outperforms blue-green light in highly turbid water. We further propose and experimentally demonstrate a broadband underwater wireless optical communication system based on a simple and cost-effective TO56 red-light laser diode. We demonstrate a 1.324-Gb/s transmission at a bit error rate (BER) of 2.02 × 10 -3 over a 6-m underwater channel, by using 128-QAM OFDM signals and a low-cost 150-MHz positive-intrinsic-negative photodetector, with a record spectral efficiency higher than 7.32 bits/Hz. By using an avalanche photodetector and 32-QAM OFDM signals, we have achieved a record bit rate of 4.883 Gb/s at a BER of 3.20 × 10 -3 over a 6-m underwater channel.