Chair of Information and Coding Theory

Journal Publication on Optical Underwater Communications

Oct 30, 2018

J. Sticklus, M. Hieronymi, and P.A. Hoeher, "Effects and constraints of optical filtering on ambient light suppression in LED-based underwater communications," Sensors 2018, vol. 18(11), 3710, 2018. DOI

Abstract

Optical communication promises to be a high-rate supplement for acoustical communication in short-range underwater applications.  In the photic zone of oceanic and coastal waters underwater optical communication systems are exposed by remaining sunlight. This ambient light generates additional noise in photodetectors, thus degrading system performance. This effect can be diminished by the use of optical filters. This paper investigates light field characteristics of different water types and potential interactions with optical underwater communication. A colored glass and different thin film bandpass filters are examined as filter/detector combinations under varying light and water conditions, and their physical constraints are depicted. This is underlined by various spectral measurements as well als optical signal-to-noise calculations. The importance of matching the characteristics of the LED light source, the photodetector, and the filter on the ambient conditions utilizing wider angle of incidents is emphasized.