CONTROLLING OPTICAL SIGNAL TRANSMISSION TO REDUCE OPTICAL SIGNAL DEGRADATION
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United States of America Patent
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Issued Date -
Feb 7, 2008
app pub date -
Jul 26, 2007
filing date -
Jul 26, 2006
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Abandoned
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Abstract
An optical transmission system and method may control optical signal transmission in an optical network, such as a passive optical network (PON), to reduce degradation of one or more optical signals traveling over the same optical waveguide. In particular, optical signal transmission may be controlled to reduce carrier to noise ratio (CNR) degradation of an optical signal (e.g., a multichannel video signal) resulting from the effects of stimulated Raman scattering (SRS) and/or double Rayleigh backscattering (DRBS). The CNR degradation may be reduced by controlling transmission of one or more of a plurality of optical signals in the optical network based on various parameters affecting the contribution to CNR degradation by SRS and/or DRBS and affecting the performance of the optical transmission system. The optical signal transmission may be controlled by adjusting a preemphasis and/or transmitted power of the optical signal(s).
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