Method and system for mitigating Raman crosstalk in an Ethernet passive optical network
US7660528B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2006 |
| Grant date | Feb 9, 2010 |
| Priority date | — |
| Expiry date | Dec 4, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0283
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention provides a system 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). During operation, the system transmits a data stream from the OLT to the ONU's on a first wavelength that is substantially at 1490 nm. The system also transmits a video signal stream from the OLT to the ONU's on a second wavelength that is substantially at 1550 nm. The system modifies 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.