Patent ID: 7660528

Claim:
A method for mitigating Raman crosstalk between downstream data and video transmission in an Ethernet passive optical network (EPON), wherein the EPON includes an optical line terminal (OLT) and one or more optical network units (ONU's), the method comprising: transmitting a data stream from the OLT to the ONU's on a first wavelength; transmitting a video signal stream from the OLT to the ONU's on a second wavelength; and changing the bit sequence for the data stream to change the power spectral distribution (PSD) for the data stream, thereby reducing power spectral content in the frequency range where significant Raman crosstalk can occur between data and video signal streams, wherein changing the bit sequence for the data stream involves changing a standard idle pattern by lengthening the IDLE ordered sets based on the IEEE 802.3-2005 standard, thereby spreading the transmission power across a wide range of frequencies and reducing power at frequencies where significant Raman crosstalk can occur.