DWDM
Download Full Article Dense wavelength division multiplexing
Dense wavelength division multiplexing (DWDM) is a fiber-optic transmission technique that employs light wavelengths to transmit data parallel-by-bit or serial-by-character.
Overview
The role of scalable DWDM systems in enabling service providers to accommodate consumer demand for ever-increasing amounts of bandwidth is important. DWDM is discussed as a crucial component of optical networks that allows the transmission of e-mail, video, multimedia, data, and voice—carried in Internet protocol (IP), asynchronous transfer mode (ATM), and synchronous optical network/synchronous digital hierarchy (SONET/SDH), respectively, over the optical layer.
Fundamentals of DWDM Technology
The emergence of DWDM is one of the most recent and important phenomena in the development of fiber optic transmission technology. The functions and components of a DWDM system, including the enabling technologies, and a description of the operation of a DWDM system are discussed below.
Development of DWDM Technology
Early WDM began in the late 1980s using the two widely spaced wavelengths in the 1310 nm and 1550 nm (or 850 nm and 1310 nm) regions, sometimes called wideband WDM. Figure below shows an example of this simple form of WDM. One of the fiber pair is used to transmit and the other is used to receive. This is the most efficient arrangement and the one most found in DWDM systems.
Download Full Article Dense wavelength division multiplexing