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wavelength or signal can be sent to any port in the ROADM. Colorless implies every port in the ROADM can handle or accept any wavelength or color of light. Contentionless allows several identical wavelengths or signals can be dropped from several ports at the same time. Gridless means that the ROADM can handle frequencies or signals that aren't precisely 50 GHz apart from each other. This is relevant because 50 GHz spacing has been traditionally used in fiber optic communications.
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technology, however MEMS and liquid crystal technologies are the most widely used. ROADMs were first introduced in 2002 with the introduction of DWDM. ROADMs can be directionless, colorless, contentionless, and gridless. Directionless means that any wavelength can be dropped from any fiber, and any
73:(DWDM) equipment, but by 2005, it began to appear in metro optical systems because of the need to build out major metropolitan networks in order to deal with the traffic driven by the increasing demand for
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The planning of entire bandwidth assignment need not be carried out during initial deployment of a system. The configuration can be done as and when required without affecting traffic already passing the
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In ROADM, as it is not clear beforehand where a signal can be potentially routed, there is a necessity of power balancing of these signals. ROADMs allow for automatic power balancing.
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without the need to convert the signals on all of the WDM channels to electronic signals and back again to optical signals.
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The switching or reconfiguration functions of a ROADM can be achieved using a variety of switching technologies including
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module. This allows individual or multiple wavelengths carrying data channels to be added and/or dropped from a transport
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Light
Reading's Heavy Reading - "ROADMs and the Future of Metro Optical Networks", May 2005
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ROADM allows for remote configuration and reconfiguration.
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that adds the ability to remotely switch traffic from a
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ROADM functionality originally appeared in long-haul
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25:reconfigurable optical add-drop multiplexer
201:. Elsevier Inc. Chapters. 9 August 2013.
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131:"The ROADM ahead | Fibre Systems"
71:dense wavelength division multiplexing
54:The main advantages of the ROADM are:
172:Springer Handbook of Optical Networks
92:and beam-steering switches in planar
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224:Optical Network Design and Planning
146:Optical Network Design and Planning
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37:wavelength-division multiplexing
82:microelectromechanical systems
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16:Optical network component
227:. Springer. 6 May 2014.
149:. Springer. 6 May 2014.
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21:optical communication
111:Optical mesh network
39:(WDM) system at the
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105:See also
84:(MEMS),
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