Fully protected broadcast and select all optical network
US7499647B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2003 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Jan 7, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/437
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An all optical network for optical signal traffic provides at least a first ring with at least a first clockwise fiber, a second counter-clockwise fiber and a plurality of network nodes. Each node has at least a WDM transponder that with a line-side transmitter and a client-side receiver in a first direction, and a line-side receiver and a client-side transmitter in an opposing second direction. The line-side receiver includes a fixed or a tunable optical wavelength filter. At least a first add and a first drop broadband couplers are positioned on each fiber. Each coupler has first and second ports for through traffic and a third port for adding or dropping local traffic. The first add and first drop broadband couplers are configured to minimize a pass-through loss in each fiber. If there are multiple WDM transponders, their wavelengths are added to the ring either in series or in parallel. All wavelengths dropped from the ring are selected by each individual WDM transponder in a parallel or serial manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.