System and method for tunable chromatic dispersion compensation
US7949257B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2007 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | Nov 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2513
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
One embodiment sets forth a technique for measuring chromatic dispersion using reference signals within the operational range of amplifiers used to refresh data signals. One red/blue laser pair in the transmission node is used for measuring dispersion and chromatic dispersion compensation is added at each line node in the system. Since reference and data signals propagate through each amplifier, the reference signals used to measure chromatic dispersion receive the same dispersion compensation (and will have the same residual dispersion) as the data signals. Therefore, any residual dispersion in the data signals will manifest itself in downstream dispersion measurements and, thus, can be corrected. The tunable dispersion compensator in each line node may be set to compensate for the measured dispersion, thereby compensating for both the chromatic dispersion of the link connecting the current node to the prior node and any uncorrected residual dispersion from prior nodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.