Comparative analysis of DWDM system using different modulation and dispersion compensation techniques at different bit rates

Abstract: Dense wavelength division multiplexing (DWDM) is a fiber optic technology that can transmit multiple information streams simultaneously over the single fiber. In this paper we are doing comparative analysis of 16 channels Dense wavelength division multiplexing (DWDM) system using different modulation formats (NRZ, Carrier suppressed return-to-zero, Duobinary return-to-zero and Modified duobinary return-to-zero) and compensation schemes ( Pre, Post and Mix compensation) at different bit rates (10Gbps, 20Gbps and 40Gbps) with standard and dispersion compensated fiber on the basis of Q-factor, eye-diagram and bit error rate for fixed gain EDFA and length both type of fiber. On the basis of comparison we found that mix compensation is superior to pre and post compensation schemes and gives better results even at high bit rate (40Gbps) with Modified duobinary return-to-zero (MDRZ) modulation format.

Keywords: DWDM, NRZ, CSRZ, DRZ, MDRZ, Quality factor