Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2004-08-27
2008-11-11
Bello, Agustin (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S082000, C398S085000
Reexamination Certificate
active
07450851
ABSTRACT:
A system and method for modularly scalable architecture for optical networks are provided. In one embodiment, a node for an optical network comprises a plurality of in-line switches connected to an optical ring and operable in a first state to both pass an optical signal received from the optical ring to an associated coupler and pass an optical signal received from the associated coupler to the optical ring. The optical signal carries traffic in a plurality of channels. A drop coupler is coupled to a first in-line switch and is operable to receive an optical signal from the in-line switch where the switch is in the first state, pass a first copy of the optical signal back to the in-line switch for passing to the optical ring, and drop a second copy of the optical signal to a distributing element. The distributing element is operable to receive the second copy and pass traffic in one or more channels of the second copy. A filter is operable to reject one or more channels of the first copy to generate a passthrough signal. A combining element is operable to receive traffic in one or more channels to be added to the optical ring and combine the received traffic to generate an add signal. An add coupler is coupled to a second in-line switch and is operable to receive the passthrough signal from the second in-line switch when the switch is in the first state, add the add signal to the passthrough signal to generate a combined signal, and pass the combined signal to the second in-line switch for passing to the optical ring.
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Shinji, “High-Performance Optical Branching and Inserting Unit and Wavelength
Bihon Daniel
Gumaste Ashwin Anil
Baker & Botts L.L.P.
Bello Agustin
Fujitsu Limited
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