Spotlight-Nature Photonics

  • 2015-11-13
  • System Admin
A high-speed underwater optical communications link that operates at a data rate
of 4.8 Gbits s−1 over a distance of 5.4 m has been demonstrated by scientists
in Saudi Arabia and Taiwan. The link is the result of work by Hassan Oubei
and co-workers from King Abdullah University of Science and Technology (KAUST),
National Taiwan University and National Chiao Tung University. It makes use of
a 15 mW blue laser diode with a wavelength of 450 nm to transmit light pulses
in the blue-green low-absorption window of seawater, which are then detected
by a silicon avalanche photodiode-based receiver. A 16-QAM-OFDM modulation
and multiplexing format is used to optimize the links signal-to-noise ratio
(15.63 dB) and bit error rate (2.6 × 10−3). Such high-speed underwater
communication links are expected to be useful for providing data connections
to sensor networks and remotely operated vehicles.

Nature Photonics 9, 707 (2015) doi:10.1038/nphoton.2015.218

Published online 29 October 2015

Optics Express 23, 23302–23309 (2015), doi: 10.1364/OE.23.023302