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Brighter lights lead to better communications under the sea

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Hank Hogan, [email protected]

Future oceanographic research could be done more cheaply and efficiently, thanks to a communication innovation powered by the latest LEDs and detectors. Researchers from Woods Hole Oceanographic Institution used these in a demonstration of remote optical communication under water, which they described at the 2010 Ocean Sciences Meeting in Portland, Ore. Unlike acoustic communication techniques that have been the standard, the new approach is fast enough for video. “We’ve done that, certainly. It’s compressed video,” said team leader Norman E. Farr. “We can...Read full article

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    Published: May 2010
    Glossary
    avalanche photodiode
    A device that utilizes avalanche multiplication of photocurrent by means of hole-electrons created by absorbed photons. When the device's reverse-bias voltage nears breakdown level, the hole-electron pairs collide with ions to create additional hole-electron pairs, thus achieving a signal gain.
    bandpass
    The range of frequencies that will pass through a filter or other device. Synonymous with passband.
    photodiode
    A two-electrode, radiation-sensitive junction formed in a semiconductor material in which the reverse current varies with illumination. Photodiodes are used for the detection of optical power and for the conversion of optical power to electrical power. See avalanche photodiode; PIN photodiode.
    photomultiplier tube
    A photomultiplier tube (PMT) is a highly sensitive vacuum tube that detects and amplifies low levels of light. It is widely used in various applications where high sensitivity, fast response times, and low-light detection capabilities are crucial. Photomultiplier tubes are particularly valuable in scientific research, medical diagnostics, and industrial instrumentation. Key features and principles of PMTs include: Photoelectric effect: The operation of a photomultiplier tube is based on the...
    receiver
    A detector and signal demodulator used in optical communications systems to receive a signal and often to translate it into an electronic signal.
    transmitter
    In fiber optic communications, a light source whose beam can be modulated and sent along an optical fiber, and the electronics that support it.
    wavelength
    Electromagnetic energy is transmitted in the form of a sinusoidal wave. The wavelength is the physical distance covered by one cycle of this wave; it is inversely proportional to frequency.
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