Reconfigurable optical add-drop multiplexer
- Reconfigurable optical add-drop multiplexer
A reconfigurable optical add-drop multiplexer (ROADM) is a form of optical add-drop multiplexer that adds the ability to remotely switch traffic from a WDM system at the wavelength layer. This allows individual wavelengths carrying data channels to be added and dropped from a transport fiber without the need to convert the signals on all of the WDM channels to electronic signals and back again to optical signals.
The main advantages of the ROADM are:
* 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.
* ROADM allows for remote configuration and reconfiguration.
* 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.
ROADM functionality originally appeared in long-haul 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 packet-based services.
The switching or reconfiguration functions of a ROADM can be achieved using a variety of switching technologies including MEMS, Liquid crystal, thermo optic and beam-steering switches in planar waveguide circuits, and tunable optical filter technology.
References
* [http://img.lightreading.com/heavyreading/pdf/hr20050517_esum.pdf Light Reading's Heavy Reading - "ROADMs and the Future of Metro Optical Networks", May 2005]
* [http://www.seefire.org/content/modules/downloads/SEEFIRE-WP2-Deliverable2.1-p-20051115x.pdf South-East Europe Fibre Infrastructure for Research and Education - Dark Fibre Lighting Technologies]
External links
* [http://www.ciena.com/products/products_CN_4200_ROADM.htm?smart_search CN 4200 ROADM]
Wikimedia Foundation.
2010.
Look at other dictionaries:
Reconfigurable Optical Add Drop Multiplexer — ROADM est l acronyme de l expression anglaise Reconfigurable Optical Add Drop Multiplexer, ou « multiplexeur optique d insertion extraction reconfigurable », selon la traduction homologuée par l Office québécois de la langue française.… … Wikipédia en Français
Optical add-drop multiplexer — Not to be confused with add drop multiplexer. Optical add drop multiplexer, using a fiber Bragg grating and two circulators. An optical add drop multiplexer (OADM) is a device used in wavelength division multiplexing systems for multiplexing and… … Wikipedia
Add-drop multiplexer — An add drop multiplexer (ADM) is an important element of an optical fiber network. A multiplexer combines, or multiplexes, several lower bandwidth streams of data into a single beam of light. An add drop multiplexer also has the capability to add … Wikipedia
Optical mesh network — Transport network based on SONET/SDH ring architecture Optical mesh networks are a type of telecommunications network. Transport networks, the underlying optical fiber based layer of telecommunications networks, have evolved from DCS (Digital… … Wikipedia
Optical Society of America — The Optical Society of America (OSA) is a scientific society dedicated to advancing the study of light optics and photonics in theory and application, by means of worldwide research, scientific publishing, conferences and exhibitions, partnership … Wikipedia
ROADM — Reconfigurable Optical Add Drop Multiplexer ROADM est l acronyme de l expression anglaise Reconfigurable Optical Add Drop Multiplexer, ou « multiplexeur optique d insertion extraction reconfigurable », selon la traduction homologuée par … Wikipédia en Français
Wavelength-division multiplexing — For the radio station, see DWDM FM. Multiplex techniques Circuit mode (constant bandwidth) TDM · FDM · SDM Polarization multiplexing Spatial m … Wikipedia
Luxemburg — Groussherzogtum Lëtzebuerg (luxemburgisch) Großherzogtum Luxemburg (deutsch) Grand Duché de Luxembourg (französisch) … Deutsch Wikipedia