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Dense wavelength division multiplexing technology has been introduced to transmit multiple information streams simultaneously over a single fiber at a data rate as high as the fiber plant allows (2.4 Gbps). For this an algorithm has been developed on a transmission network of an end-to-end unidirectional system. The system supports SONET/SDH sort-reach optical interface to which any client compliant device can be attached. The algorithm has been implemented by using C++ language. The frequency bandwidth has been selected in the range of C to V band, as designated by ITU grid. In the end-to-end unidirectional based DWDM system, the transponder accepts input in the form of a standard single-mode or multimode laser. These wavelengths have been mapped to a DWDM wavelength which has been multiplexed into a single optical signal and launched into the fiber. A preamplifier should be used before it enters the end system. The incoming signal is demultiplexed into individual DWDM lambdas (or wavelengths).