Low loss WDM add drop node
US7623789B2 · kind B2 · utility
4Cited by
49References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2002 |
| Grant date | Nov 24, 2009 |
| Priority date | — |
| Expiry date | Jan 25, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0206
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an optical fiber network bidirectional WDM traffic is sent on one optical main transmission fiber (1) between two nodes (A, B) connected in the path of the transmission fiber. The bidirectional traffic between a pair of nodes is carried on two different wavelength channels (Nos. 1, 2), one for each direction. The two wavelength channels are added to/dropped from the traffic in the ring fiber (1) in each node using a two-channel add/drop filter (5e1-2, 5w1-2), e.g. a band add/drop filter. In this way the number of add/drop filters connected in the path of the transmission fiber can be kept as small as possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.