Abstract
The paper presents a comprehensive analysis of a 40 Gbps Dense Wavelength Division Multiplexing system with 32 channels, spaced at 50 GHz. The design has been optimized for a long haul optical link...
Highlights
The transport capacity of the existing optical networks has grown explosively over the last few decades due to the phenomenal upsurge of high speed and bandwidth intensive internet services (Agrawal, 2002; Charlet, 2006)
The results of the 1st channel were studied to correlate and infer the results of other adjacent channels. For both Duobinary Return-to-Zero (DRZ) and Modified Duobinary Return-to-Zero (MDRZ) formats, the optimum performance was observed for the case of symmetrical dispersion compensation case which is in close agreement to the results reported in literature (Hodzic et al, 2002; Hoshida et al, 2002), and this scheme was used throughout the paper
After finalizing on the symmetric scheme, we ran the simulations for two cases: (1) Perfect compensation of group velocity dispersion (GVD) and (2) Residual Dispersion compensation of GVD
Summary
The transport capacity of the existing optical networks has grown explosively over the last few decades due to the phenomenal upsurge of high speed and bandwidth intensive internet services (Agrawal, 2002; Charlet, 2006). Its compact spectrum makes duobinary format compatible with 50 GHz ITU grid, further conforming the 40 Gbps system to the existing 10 Gbps WDM long-haul transport infrastructures (Xu, Wang, Chowdhury, Yu, & Chang, 2006; Yonenaga & Kuwano, 1997) and permits an easier upgrade to 40 Gbps network by just interchanging the transmitters without making significant changes in the receiver and transmission line design It has 3-levels which are generated by the usage of differential precoding and electrical or optical filtering. Modified Duo-binary Return-to-Zero format MDRZ format has a much narrower optical bandwidth over the DRZ leading to greater dispersion tolerance and higher fiber non linearity tolerance (Miyamoto et al, 2001; Xu et al, 2006) In this format, the phases of two groups of “ones” that wrap an isolated “zero” are flipped, leading to reduced ghost pulse generation caused by intra-channel four-wave mixing. Throughout this paper Q-factor of 15.6 dB has been considered as reference and the performances of various parameters are evaluated
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