Optical performance monitoring for D/WDM networks
US6922532B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 7, 2000 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Feb 13, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/078
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A performance monitoring method for an optically amplified transmission system. The method provides the optical power at each amplifier site, taking into account the inaccuracies introduced by the SRS in the power estimation obtained with the current methods. An optical spectrum analyzer is used at the output of the transmission link of interest to accurately measure the output power of each wavelength. This value is sent upstream to the last amplifier in the link, to compute an error term as the difference between the actual measurement and the estimation. The error term is used to infer the SRS-induced error by system elements not accounted for in the model. The error term is then fed-back to each amplifier in the link, so that the estimated power is adjusted to account for the SRS-induced inaccuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.