Further the use of non-overlapping channels allows each channel to operate at peak speeds.
Dense Wavelength Division Multiplexing (DWDM) is a fiber-optic transmission technique.
The paper talks about the various optical network architectures and the various components of an all-optical network like Optical Amplifiers, Optical Add/Drop Multiplexors, Optical Splitters etc.
Important optical networking concepts like wavelength routing and wavelength conversion are explained in detail.
It employs light wavelengths to transmit data parallel-by-bit or serial-by-character.
DWDM is a very crucial component of optical networks that will allow the transmission of data: voice, video-IP, ATM and SONET/SDH respectively, over the optical layer.It involves the process of multiplexing many different wavelength signals onto a single fiber.So each fiber have a set of parallel optical channels each using slightly different light wavelengths.So in essence a lot of network elements will be eliminated and there will be a reduction of electrical equipment.It is possible to classify networks into three generations depending on the physical-level technology employed.The most important components of any DWDM system are transmitters, receivers, Erbium-doped fiber Amplifiers, DWDM multiplexors and DWDM demultiplexors.Fig 1 gives the structure of a typical DWDM system.The concepts of optical fiber transmission, amplifiers, loss control, all optical header replacement, network topology, synchronization and physical layer security play a major role in deciding the throughput of the network.These factors have been discussed briefly in this sections that follow.Hence with the development of WDM technology, optical layer provides the only means for carriers to integrate the diverse technologies of their existing networks into one physical infrastructure.For example, though a carrier might be operating both ATM and SONET networks, with the use of DWDM it is not necessary for the ATM signal to be multiplexed up to the SONET rate to be carried on the DWDM network.