Countermeasures for idle pattern SRS interference in ethernet optical network systems
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United States of America Patent
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Nov 10, 2009
Grant Date -
Aug 7, 2008
app pub date -
Dec 14, 2007
filing date -
Aug 10, 2005
priority date (Note) -
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Abstract
Optical networks as defined by the IEEE 802.3ah standard suffer from Stimulated Raman Scattering (SRS) that causes data transmission at a first optical wavelength to interfere with broadcast video transmission at a second optical wavelength in single mode optical fibers. The problem is exacerbated when data is not being transmitted across the network; and instead, an idle pattern transmission is being transmitted in order to keep the network synchronized. The repetitive nature of the idle pattern transmission leads to the SRS optical interference effect. This optical interference effect is mitigated when countermeasures are implemented to modify the idle pattern transmissions or to transmit random data in place of the idle pattern transmissions.
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