Method and apparatus for sampled optical signal monitoring
US7899324B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2006 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Oct 13, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0054
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Monitoring an optical signal comprises sampling the optical signal from two or more distinct tap points to retrieve a sample set. Multiple such sample sets are obtained over time. A joint probability distribution or phase portrait of the sample sets is assessed for indications of optical signal quality. The tap distinction can be polarization, for example to determine OSNR, or frequency. The tap distinction can be a time delay, which can enable diagnostic differentiation between multiple impairments, such as OSNR, dispersion, PMD, jitter, Q, and the like. Machine learning algorithms are particularly suitable for such diagnosis, particularly when provided a two dimensional histogram of sample density in the phase portrait.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.