Comparative Study Between the WDM System and the DWDM in an Optical Transmission Link at 40 Gb/s

摘要

The WDM multiplexing is explained by the fact that always transmit multiple signals of different colors (or channels) at the same time while avoiding the costs of civil engineering about the stacking of the repeater-regenerators. The WDM allows to multiply by 16 the capacity of the fiber at the same modulation speed, but each signal has a distinct wavelength, but the DWDM (Dense WDM) makes it possible to multiply by 160 the wavelengths [1]. In this paper we will elaborate a detailed comparative study to extract the performances using the different simulations based on a software system. This paper takes into account the different modulations of the signal in transmission (RZ, NRZ ... etc.), the number of channels and the impact of the nonlinear effects on the multiplexing.