add/drop multiplexer


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add/drop multiplexer

A device installed at an intermediate point on a transmission line that enables new signals to come in and existing signals to go out. In a typical example, most signals pass through the device, but some would be "dropped" by splitting them from the line. Signals originating at that point can be "added" into the line and directed to another destination.

Add/drop multiplexing can be done with optical or electronic signals. The device may deal only with wavelengths, or it may convert between wavelengths and electronic TDM signals. The setup in an add/drop multiplexer is generally static, and the device is not reprogrammed very often. See TDM, DWDM, digital cross-connect, DCS and grooming.


Add/Drop Multiplexer
Note that the new signal being added can use the same optical channel (wavelength) as the dropped signal. (Illustration assistance courtesy of Jeff Hecht.)
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References in periodicals archive ?
The Alcatel 1686 WM is ideal to build Optical Terminal Multiplexer for point-to-point and Optical Add/Drop Multiplexer for multi-point-to-multi-point regional and metro networks, satisfying the fast growing demand of operators for higher and flexible bandwidth.
Ciena's MultiWave CoreDirector, based on Lightera's flagship product, is described as an intelligent optical cross-connect system able to replace both legacy cross-connect systems and the SONET add/drop multiplexers used in conjunction with those systems.
In addition, the US Army will be deploying the Metropolis WSM ROADM (reconfigurable optical add/drop multiplexer).
For point-to-point applications, WDM systems typically include a pair of terminals, one or more optical amplifiers, and, in some cases, an optical add/drop multiplexer.
In the near future, the SURFnet6 network will be equipped with additional Nortel optical technologies such as: Enhanced Reconfigurable Optical Add/Drop Multiplexer (eROADM); Electronically Dynamically Compensating Optics (eDCO); and Dynamic Resource Allocation Controller (DRAC), the company claims.
* The robustness and reliability of an ATM add/drop multiplexer; and
• Reconfigurable optical add/drop multiplexers (ROADM)