Method and apparatus for optical add/drop multiplexing in optical networks
US7139486B2 · kind B2 · utility
1Cited by
1References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2003 |
| Grant date | Nov 21, 2006 |
| Priority date | — |
| Expiry date | Jul 25, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/258
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical add/drop multiplexing (OADM) apparatus and method are disclosed for detecting pilot tones, removing ghost tones, and re-inserting pilot tones on WDM signals in an optical network. The OADM apparatus comprises a smart processing and control unit (PCU) for detecting pilot tones used for channel identifications, including identifying and removing ghost tones associated with respective optical channels, and re-inserting the processed pilot tones into the respective optical channels. The OADM apparatus and method may incorporate digital PCU or analog PCU for processing pilot tones and removing ghost tones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.