Free-space optical communication system employing wavelength conversion
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United States of America Patent
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Issued Date -
Nov 21, 2002
app pub date -
May 21, 2001
filing date -
May 21, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Free-space optical transceivers employ wavelength conversion from a fiber interface wavelength .lambda..sub.fiber to a free-space transform wavelength .lambda..sub.fs and back again to overcome a broad range of environmental impacts to the free-space optical signal, such as fog. The wavelength conversions may be performed all-optically without the need for electro-optical conversion, or the wavelength conversions may be performed using electro-optical conversion. The performance of the chosen value for the free-space transform wavelength .lambda..sub.fs may be monitored and a feedback control system used to dynamically adjust the value for .lambda..sub.fs until the optimum value for the given atmospheric conditions is achieved. Cooperating transceivers can be informed of a newly selected value for .lambda..sub.fs via a direct, out-of-band control communications channel, or cooperating transceivers can determine the appropriate wavelength transform amount to be applied by an adaptive wavelength selection determination.
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