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Dense Wavelength Division Multiplexing (DWDM) is the ability to combine a set of optical wavelengths for transmission over a single fibre. DWDM technology is an extension of optical networks and the main advantage of DWDM is that it is protocol and transmission rate independent, allowing DWDM-based networks to transmit data over IP, ATM, SONET, SDH and Ethernet. DWDM systems typically have the following optical components: DWDM optical modules, DWDM MUX/DEMUX, DWDM OADM and optical amplifiers. Today we talk about EDFA . The EDFA optical amplifier is an optical fibre amplifier that uses erbium ions as a gain medium. Optical amplifiers amplify optical signals over a wide range of wavelengths, which is important for DWDM system applications. In contrast to EDFAs used in CATV or SDH systems, EDFAs used in DWDM systems are sometimes referred to as DWDM EDFAs. To extend the transmission distance of DWDM systems, one can choose from different types of optical amplifiers, including DWDM EDFAs...

Dense Wavelength Division Multiplexing (DWDM) is the ability to combine a set of optical wavelengths for transmission over a single fibre. DWDM technology is an extension of optical networks and the main advantage of DWDM is that it is protocol and transmission rate independent, allowing DWDM-based networks to transmit data over IP, ATM, SONET, SDH and Ethernet. DWDM systems typically have the following optical components: DWDM optical modules, DWDM MUX/DEMUX , DWDM OADM and optical amplifiers. Today we talked about DWDM MUX/DEMUX A DWDM multiplexer (Mux) combines the output optical signals from multiple transmitters for transmission over a single fibre. At the receiving end, another DWDM demultiplexer (Demux) separates the combined optical signals. only one fibre is used between  DWDM multiplexers  (in each transmission direction). instead of using a single fibre in each pair of optical modules, DWDM allows multiple optical channels to occupy a single optical cable. HTF ...