High-degree reconfigurable optical add-drop multiplexing systems using bi-directional wavelength selective switches
US8306425B2 · kind B2 · utility
1Cited by
1References
20Claims
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Key dates
| Filing date | Jan 21, 2009 |
| Grant date | Nov 6, 2012 |
| Priority date | — |
| Expiry date | Apr 12, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0052
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present disclosure provides high-degree reconfigurable optical add-drop multiplexing (ROADM) systems using bi-directional wavelength selective switches (WSSs) and optical circulators. A single WSS is utilized on each degree of a node in a bi-directional manner, i.e. both ingress and egress share the same WSS. Advantageously, the present invention eliminates conventional splitters/combiners thereby capping intra-node insertion loss to a certain value regardless of the number of degrees. More importantly, the present invention reduces noise penalty associated with high-degree nodes while minimizing cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.