OFDMA overlay on legacy passive optical networks using optical nyquist filtering
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United States of America Patent
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Dec 29, 2015
Grant Date -
Dec 18, 2014
app pub date -
Jun 13, 2014
filing date -
Jun 13, 2013
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Abstract
Methods and systems for combining signals include modulating data onto a first signal at a first frequency and wavelength; modulating data onto a second signal at a second wavelength using a modulation scheme that produces spectral components at the first frequency; filtering the second signal using an optical filter to suppress spectral components that would cause interference to the first signal; and combining the first signal and the second signal onto a transmission medium.
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