DWDM based Optical Fiber Communication Link using Different Modulation Formats and Dispersion Compensating Fiber

Dense Wavelength Division Multiplexing (DWDM) is a technique that can be used to increase the channel capacity and meet with the growing demand of bandwidth in Optical Fiber Communication system. In this technique multiple information signals are transmitted using a composite optical signal. Each of the information signals is transmitted at a particular optical wavelength in an optical fiber. The presence of non-linear effects in optical fiber namely Four Wave Mixing (FWM), Self Phase Modulation (SPM), Cross Phase Modulation (CPM), Stimulated Raman Scattering (SRS), Stimulated Brillouin Scattering (SBS) degrades the performance of the DWDM transmission system. In this paper, investigation of a DWDM transmission system is performed using different modulation formats, power levels, data transmission rates and number of information channels in the link. A single mode fiber of length 100 km at 1550 nm wavelength is used along with a dispersion compensating fiber in order to reduce dispersion. The performance of the signal received at the receiver is analyzed on the basis of quality factor and bit error rate (BER).