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A main element of optical fiber networks. An '''add-drop [[multiplexer]]''' (ADM) combines, or multiplexes, several lower-speed streams of data into a single beam of light. ADMs can be used both in long-haul core-networks and in shorter distance metro networks, although in recent years (2002-04) most ADM sales have been in metro networks due to the high cost required to scale the technology to high data rates ([[wavelength division multiplexing]], better known as DWDM, is more popular in the core).
The main filtering technology used in add-drop multiplexers is the [[Fabry-Perot Interferometer]], in the form of small, solid [[etalon]]s.
A recent shift in ADM technology has introduced so called '''multi-service [[SONET]]/[[SDH]]''' (also known as a multi-service provisioning platform, or [[MSPP]]) equipment which has all the capabilities of legacy ADMs, but can also include cross-connect functionality to manage multiple fiber rings in a single chassis. These new devices can replace multiple legacy ADMs and also allow connections directly from [[Ethernet]] [[LAN]]s to a service provider's optical backbone.
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