Method for determining the optical signal-to-noise ratio and receiver device for an optical transmission system
US8301025B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 2007 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Jan 30, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/07953
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical noise signal is added to an optical data signal on the receiver side, and a signal quality of the data signal is determined. The magnitude of the added noise signal is varied, and a function of the signal quality of the data signal is determined in dependence on the added noise signal. Subsequently, a first straight line is approximated to the previously determined function for smaller values of the added noise signal, and a second straight line for larger values of the added noise signal. The optical signal-to-noise ratio is read from the intersecting point of the first straight line with the second straight line. Thus, the ASE present is derived from the controlled addition of additional ASEs, and the optical signal-to-noise ratio is determined. The process is particularly suited for DWDM systems because it works even with very narrow channel separations, or with narrowband optical filtration along the separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.