Optical communication network
US6519384B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 2001 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Aug 29, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0206
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a WDM network, nodes connected to a common transmission medium have add/drop filters for associated channel wavelengths which passively relay all other wavelengths while subjecting these to a pass-through loss. In order to optimize the transmission distance of a network, the filter elements within a node are arranged such that those channels that have the highest link losses are relayed through as few add/drop filter elements as possible. In particular, filter elements are arranged such that received channel wavelengths with a high link loss are dropped from said transmission medium upstream of received channel wavelengths with a low link loss. Similarly, for channel wavelengths transmitted by the node, the filters are arranged such that transmitted channel wavelengths with a high link loss are added to said transmission medium downstream of transmitted channel wavelengths with a low link loss. In this manner the additional losses caused by the add/drop filters are sustained by those channels that are better able to tolerate the additional power loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.