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AssigneeAvanex Corporation
InventorsGuohua Xiao, Xiaoping Mao, Lintao Zhang, Xiaofan Cao
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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.
A self-adjusting OADM (optical add-drop multiplexer) comprising:
A fiber network defining an optical path in which a wavelength division multiplexed (WDM) signal comprising one or more channels is propagated between an interconnection line and one or more subscribers, the fiber network comprising:
An optical switching assembly comprising:
A two-fiber ring network having first and second fiber rings defining first and second optical paths in which first and second wavelength division multiplexed (WDM) signals each comprising one or more channels is respectively propagated between an interconnection line and one or more subscribers, the two-fiber ring network comprising:
A method for controlling the power of an add channel of an optical add-drop multiplexer (OADM) used to add the add channel to a wavelength division multiplexed (WDM) signal including one or more express WDM channels and to drop a drop channel from the WDM signal, the method comprising:
A method for selectively directing, to a receiver, the optical signal of a predetermined channel of a wavelength division multiplexed (WDM) signal of a two-fiber ring, the two-fiber ring having a first ring and a second ring each adapted to propagate said predetermined channel, the method comprising:
A method for conducting a wavelength division multiplexed (WDM) signal between an interconnection line and one or more subscribers using a fiber ring network, the WDM signal comprising a plurality optical signals each associated with a channel, the method comprising:
Dependencies are inferred from the claim text.