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Fiber Optic Networking

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ALSO CALLED: Fibre, Fiber Optics, Optical Networking
DEFINITION: A reconfigurable optical add-drop multiplexer (ROADM) is a device that can add, block, pass or redirect modulated infrared (IR) and visible light beams of various wavelengths in a fiber optic network. ROADMs are used in systems that employ wavelength division multiplexing.Before the development of optical multiplexing devices such as ROADMs, signal routing in fiber optic networks was done by converting  … 
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FIBER OPTIC NETWORKING DEFINITION (continued): …  the IR or visible beams to electrical signals and routing those signals using conventional electronic switches. The rerouted electrical signals were then converted back into IR or visible beams.In a conventional ROADM, switching is accomplished without optical-to-electrical or electrical-to-optical conversion using three operations called add, drop and cut-through. An outgoing IR or visible beam can be generated (the add operation) or an incoming beam terminated (the drop operation). A beam can also be passed through the device without modification (the cut-through operation). In combination, … 
Fiber Optic Networking definition sponsored by SearchTelecom.com, powered by WhatIs.com an online computer dictionary
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