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An '''add-drop multiplexer''' ('''ADM''') is an important element of an [[optical fiber]] network. A [[multiplexer]] combines, or [[Multiplexing|multiplexes]], several lower-[[Bandwidth (computing)|bandwidth]] streams of data into a single beam of [[light]]. An ''add-drop'' multiplexer also has the capability to ''add'' one or more lower-bandwidth signals to an existing high-bandwidth data stream, and at the same time can extract or ''drop'' other low-bandwidth signals, removing them from the stream and redirecting them to some other network path. This is used as a local "on-ramp" and "off-ramp" to the high-speed network.<ref>{{cite web
| title = Electrical Engineering Glossary Definition for ADM
| url = http://www.maxim-ic.com/glossary/index.cfm/Ac/V/ID/8/Tm/ADM
| archive-url = https://web.archive.org/web/20080304030505/http://www.maxim-ic.com/glossary/index.cfm/Ac/V/ID/8/Tm/ADM
| archive-date = 2008-03-04}}</ref>
ADMs can be used both in long-haul core networks and in shorter-distance "[[Metropolitan area|metro]]" networks, although the former are much more expensive due to the difficulty of scaling the technology to the high data rates and [[wavelength division multiplexing|dense wavelength division multiplexing]] (DWDM) used for long-haul communications. The main optical filtering technology used in add-drop multiplexers is the [[Fabry–Pérot etalon]].
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