Abstract
Optical communication promises to be a high-rate supplement for acoustic 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 as optical signal-to-noise ratio calculations. The importance of matching the characteristics of the light emitting diode (LED) light source, the photodetector, and the filter on the ambient conditions using wider angle of incidents is emphasized.
Highlights
Subsea exploration using advanced technology demands sophisticated underwater communication.Traditionally, the acoustic channel was entirely used, offering long range but limited speed
Driving these light emitting diode (LED) with IF = 700 mA corresponds to a total radiant power of about 6 Watts for the best brightness binning group, and calculations are based on datasheets values; see [32]
In the case of shallow water underwater optical communication (UWOC) the most likely dominant noise contributor is shot noise generated by ambient light, analog to typical applications in outdoor visible light communications and wireless infrared communications [14]
Summary
Subsea exploration using advanced technology demands sophisticated underwater communication. In shallow depths the underwater optical communication (UWOC) systems are exposed to ambient sunlight This is an unavoidable source of disturbance in terms of saturation and noise, and can restrict the serviceability. Because of their narrow beam and high demands with respect to pointing and tracking, lasers and laser diodes (LD) are mostly used as light sources in the special case of stationary setups They are well known known for their high performance in terms of speed and range and play a big role in visible light communication (VLC) and in underwater communications [8,9,10,11,12].
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