Optical Network

::: Terminology List - Total 38 terms in the database

A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z     All

1+1/1:1 protection  3R regeneration  CWDM  DWDM  Electronic signal repeaters versus optical amplifiers  Ethernet passive optical network (Part I)  Ethernet passive optical network (Part II)  Fiber bandwidth and bands  Fiber dispersion  Forward error correction (FEC) coding  GMPLS  Greenfield network dimensioning  Jitter  Lightpath  Multi-state coding  Network dimensioning procedure  Network failure types  Network survivability  New generation carrier network  OADM  On-off keying modulation  Opaque networks  Optical fiber  Optical multiplexer and demultiplexer  Optical transmission terminal  Optical transport network  Optical Transport Network (OTN)  OXC  Shared backup path protection (SBPP)  Synchronous transmission standards  Traffic engineering  Traffic grooming  Translucent networks  Transparent island  Transparent networks  Wavelength channel  Wavelength conversion  WDM  


OADM stands for optical add/drop multiplexer. This is a type of degree-2 optical node, which is generally used for the construction of a ring-based optical transport network.

An OADM consists of three stages, namely, optical demultiplexer, optical switch or add/drop stage, and optical multiplexer. Optical demultiplexer functions to separate wavelengths in an inlet fiber onto individual fibers. These fibers are then either dropped, connected to 2x2 optical switches, or directly connected to optical multiplexer. The last stage is optical multiplexer which functions to multiplex all those wavelengths either added, directly from optical demultiplexer, or 2x2 optical switches, into an outlet fiber. 

All the lightpaths that directly pass an OADM are termed cut-through lightpaths, while those lightpaths added/dropped at the OADM node termed added/dropped lightpaths. In addition, depending on whether 2x2 optical switches are deployed in the middle stage, OADM can be further classified into reconfigurable OADM if optical switches are deployed, or fixed OADM if everything is not reconfigurable.

Physically, there are several ways to realize an OADM. One can use the traditional demultiplexer and multiplexer architecture to realize an OADM, or use a combination of fiber grating and optical circulators to realize an OADM. 

Although both have add/drop functionality, OADM is generally different from ADM. The former functions in the optical domain under WDM technique, while the latter is implicitly considered to functions in the traditional SDH/SONET networks.

Note: I have copied and pasted this article to Wikipedia; you can find this article there too.

Added: 05th August 2006 09:40:20 AM   Modified: 07th August 2006 02:05:46 AM

Site Search


Affiliate Sites

Call for paper

Directory Links

ATM & MPLS Theory & Application
Multi-state coding
Advice on Research and Writing (compiled by Hui Zhang)
European optical network (EON)
Networked Computer Science Technical Reference Library
Object Management Group (OMG)
Laser Focus World Magazine
U.S. Patents
Evolving Multiservice Metro Networks to Support Next Generation Service Growth
MPCP -State of the Art

Copyright(c) Optical Hub All Rights Reserved Contact webmaster