SNR enhancement in modulating retroreflector optical communication links
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United States of America Patent
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Dec 1, 2015
Grant Date -
Nov 19, 2009
app pub date -
May 15, 2008
filing date -
May 15, 2008
priority date (Note) -
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Abstract
An optical communication system may include a light transmission unit transmitting a light beam having a first polarization, a quarter waveplate to receive the light beam and to modify the light beam to have a second polarization, and a retroreflector to receive the light beam from the quarter waveplate and reflect the light beam to the quarter waveplate, which modifies the light beam to have a third polarization. The optical communication system may also include a half waveplate to modify the first polarization such that the first polarization is about 90 degrees rotated compared to the third polarization, and a polarizer to pass the light beam having the third polarization and to block most of the light beam having the first polarization.
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