Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2002-08-27
2008-10-14
Tran, Dzung D (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S045000, C398S082000
Reexamination Certificate
active
07437075
ABSTRACT:
An integrated reconfigurable planar lightwave add-drop (RPLAD) multiplexer for use in a WDM optical communication system is arranged such that each drop port can receive any wavelength channel and each add port can transmit on any wavelength channel. Drop port reconfigurability is achieved by integrating a cross-connect functionality into the RPLAD, illustratively using optical 1×2 switches to perform “space” switching. The switches are controlled from a remotely located node controller. Add port reconfigurability is achieved by having tunable lasers and a wavelength independent optical power combiner, which may be a star coupler that is integrated with the other above-mentioned elements. The RPLAD has a modular architecture, so that when RPLAD's are connected by dual unidirectional transmission rings for the purpose of redundancy and failure protection, an RPLAD that fails can be removed and the remaining module can be reconfigured so as to re-route incoming traffic backwards around the still operating optical communication ring.
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Doerr Christopher Richard
Levy David S
Murphy Timothy O.
White Alice Elizabeth
Lucent Technologies - Inc.
Tran Dzung D
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