Ultra high capacity 1.28 Tbps DWDM system design and simulation using optimized modulation format

Abstract

In this paper, an ultra high capacity optical system with transmission capacity of 1.28 Tbps using optimized modulation format is presented. The system design is achieved by using a 64-channel 20 Gbps dense wavelength division multiplexing (DWDM) technique. The proposed optimized modulation format has narrower bandwidth than conventional intensity modulation (IM) schemes. It has also high dispersion tolerance. Thus, makes it possible to attain an ultra high capacity long distance transmission. The performance characteristics of the system for different modulation formats are compared through simulation at 20 Gbps. The system is also analyzed for pre, post and symmetrical dispersion compensation techniques. We have also investigated the filtering performance of the system, using narrow-band optical filters at each input and output channel, to improve the coverage range of the proposed system. These filters have been used for analysing the DWDM system performance, for channel spacings of 100 GHz and 50 GHz. The system is designed and simulated for a coverage distance of 200 km and more. The proposed ultra high capacity system is expected to be more technically viable due to the use of optimized modulation format. Results and analysis of the proposed system are also presented. This system will be highly useful for high speed data processing, in the present communication and computer networks. � 2012 Elsevier GmbH. All rights reserved.