Protected bidirectional WDM network
US7343093B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Apr 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0294
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical WDM ring network includes at least two add/drop nodes connected in a ring path. The ring path comprises only a single optical fiber arranged for bidirectional traffic between the nodes. A 2×2 switch is used in one of the add/drop nodes for switching signals forwarded from the node to the other node to travel either on a first segment of the ring path or on a second, complementary segment of the ring path when required for protection purposes. Signals from the other node to the first node are issued to travel on both segments but the switch selects the actual segment from which the signals are received in the first node. The signals switches by the switch can be high priority signals used in protected channels communicated between the node and another node. On the segment from which the high priority signals are not received, low priority signals in non-protected channels can be communicated between the nodes, these channels also passing the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.