Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-03-21
2006-03-21
Vanderpuye, Kenneth (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S085000, C398S034000, C398S094000
Reexamination Certificate
active
07016610
ABSTRACT:
A self-adjusting optical add-drop multiplexer monitors the power in a drop signal and attenuates the power in an add signal to match the power in express WDM channels (signals). When used in a fiber network, and more particularly, in a metro network, the deleterious effects of optical amplification are reduced. Power attenuation is also used in an optical switching assembly particularly useful in two-fiber ring network. The optical switching assembly monitors drop channels from the two rings of the network and attenuates the add channel(s) accordingly. An optical switch operates to direct the drop signal from one of the two rings to a receiver in accordance with a control signal based on the monitored drop channels. The self-adjusting optical add-drop multiplexer also monitors the power in the drop signals and issues an alarm if the drop signal is of a power level above or below predetermined levels.
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Cao Xiaofan
Mao Xiaoping
Xiao Guohua
Zhang Lintao
Avanex Corporation
Patterson & Sheridan
Tran Dzung
Vanderpuye Kenneth
LandOfFree
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