Dense Wavelength Division Multiplexing-DWDM

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Dense Wavelength Division Multiplexing (DWDM) is a technology that allows multiple information streams to be transmitted simultaneously over a single fiber. This provides a cost effective method to increase the capacity of the existing networks without the need to add additional fiber. This application note explains capabilities of the OptiSystem software to explore different design structures (e.g. modulation format, linear and nonlinear impairment compensation) to optimize the performance the DWDM system.
For the point-to-point DWDM transmission system, various modulation formats are compared by numerical simulation of 16?40Gbps with the channel spacing 100 GHz. The performance analysis of DWDM system for NRZ, RZ, CSRZ formats has been carried out in order to find the optimum modulation format for a high bit rate optical transmission system. The system has been analyzed for the Pre, Post and Symmetrical dispersion compensation schemes and the fiber has been fully compensated using DCF. It has been observed that the performance of the DWDM system is severely limited by the FWM effect. Simulation resultsshow that the CSRZ transmitter and Symmetrical dispersion compensation schemes give the best performance. However, NRZ and RZ formats are not suitable for long haul DWDM systems.
Based on point-to-point DWDM system, the project investigate the issues at high data bit rate, particularly 10 Gbps (OC-192) DWDM systems in metro area ring networks. Beside loss compensation, the system need to be considered the nonlinear effects and the chromatic dispersion compensation.

There has always been a technological talent to fulfill the constant need to extent the capacity of communication channel and DWDM (Dense Wavelength Division Multiplexing) has dramatically brought about an explosive enlargement of the capacity of fiber network, solving the problem of increasing traffic demand most economically.

DWDM is a technique that makes possible transmission of multiple discrete wavelengths carrying data rate as high as fiber plant allows over a single fiber unidirectionally or bidirectionally.

It is an advanced type of WDM in which the optical channels are more closely spaced than WDM.

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