Use of tunable laser for optical performance monitoring in WDM system
US6795607B1 · kind B1 · utility
27Cited by
21References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2001 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Nov 2, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0279
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Consistent with the present invention, a tunable laser emits a monitoring signal which is combined with the WDM channels typically at the transmit side of a WDM system. At each monitoring point along the WDM system, the WDM channels are filtered out, the monitoring signal is sensed, and desired systems parameters (e.g., gain flatness, dispersion, PMD and OSNR) are measured. Accordingly, a single tunable element, i.e., the tunable laser, can be provided, thereby reducing costs. Moreover, system performance can be ascertained regardless of whether WDM channels are present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.