Method And Apparatus Of Free-Space Optical Signal Reception Having Enhanced Performance In Scattering Environments
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United States of America Patent
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Issued Date -
May 17, 2012
app pub date -
Nov 12, 2010
filing date -
Nov 12, 2010
priority date (Note) -
Abandoned
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Abstract
A free space optical receiver is provided that can mitigate the detrimental effects of scattering. In an implementation, the optical beam is imaged onto a detector array in the image plane of the receiver telescope. The detector array has a series of two or more concentric zones for detecting optical power, i.e., for converting optical input to electrical output. The electrical output from each of the detection zones is processed by a respective adaptive equalizer, which is operative for compressing the detected signal pulses to counteract the effect of delay spread and thereby to reduce inter-symbol interference. The outputs from the respective adaptive equalizers are then combined for the purpose of signal recovery.
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