Optical add/drop multiplexer/demultiplexer

Details Optical add/drop multiplexer/demultiplexer Optical add/drop multiplexer/demultiplexer

H - Electricity

04

J

H04J 14/02 (2006.01) H04Q 11/00 (2006.01)

Patent

CA 2272023

An add/drop multiplexer/demultiplexer (ADM) for switching, modulating and attenuating optical signals in a fiber optic network employing WDM. The ADM has an optical multiplexer for splitting an input WDM signal into individual optical signals, leading to respective 2x2 switches. Each switch has another input originating from a plurality of "add lines". The input signals are tapped, optoelectronically converted and fed to a controller, which reads switching, modulation and attenuation instructions. The instructions can be encoded into a low-frequency dither signal that is embedded within the input optical signals. The ADM can accordingly be instructed to reroute traffic, dynamically equalize optical channel power levels, and add or remove dither, all in real time. A bidirectional ADM can be constructed from two unidirectional ADMs. Also, a single, general multi-input multi-output switch can be used to provide an arbitrary mapping between individual input and output optical signals.

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