What is OADM Multiplexer and application?
As a key component for DWDM and UW-WDM (ultra wide wavelength division multiplexing) optical networks, OADM is used for selectively dropping and inserting optical signals into a transparent DWDM network. We know that the main function of an optical multiplexer is to couple two or more wavelengths into the same fiber. If a demultiplexer is placed and properly aligned back-to-back with a multiplexer, it is clear that in the area between them, two individual wavelengths exist. This makes it possible for OADM to remove or insert individual wavelengths.
Functions of the OADM
An OADM generally consists of three parts: an optical demultiplexer, an optical multiplexer, a method of reconfiguring the paths between the optical demultiplexer and the optical multiplexer, as well as a set of ports for adding and dropping signals. The multiplexer is used to couple two or more wavelengths into the same fiber. Then the reconfiguration can be achieved by a fiber patch panel or by optical switches that direct the wavelengths to the optical multiplexer or to drop ports. The demultiplexer separates the multiple of wavelengths in a fiber and directs them to many fibers.
Application of OADM
In conventional long-haul transmission systems, emphasis has been placed on how much capacity and how far the system can transmit. In metro/access networks, however, low cost and system flexibility are strongly required. OADM canverify both demands. The main battlefield of OADM application is in MAN (metropolitan area network), featuring high flexibility, easy upgrade and amplification. As an ideal multi-services transport platform in MAN application, OADM also allows different wavelength multiplexing signal at different locations. Another application for OADM is in Optical Cross Connection (OXC). Proposed equipment allow different network to connect dynamic, on-demand wavelength resources and a wider range of network interconnection. OADM and OXC only need to download the information in the nodes to send the person that handles the equipment, including ATM switchboard, SDH switchboard, IP router etc., which greatly improve the efficiency of the node to process information.