Study on increasing the capacity of RoF systems for long distance optical communication using solitons

Abstract

In order to enable long distance communication, the light signal in Radio-over-fiber (RoF) technique is modulated by a radio signal. WDM (wavelength division multiplexing) technology is an effective way which can be used in the optical fiber feeder network to increase the capacity of RoF systems. In spite of the advantages RoF has nonlinear effects such as dispersion which can be mitigated by selecting appropriate dispersion management techniques. One of the challenges of WDM is the proper wavelength spacing. It must be properly designed so that signal interference does not occur. In this paper we try to review which dispersion management technique provides greater efficiency for long haul optical networks. The performance efficiency of different modulation techniques and different orders of modulation is also reviewed. So, by this work we try to propose a model which will provide better output power and low dispersion level which is the primary concern of any optical transmission system. The proposed model incorporates a WDM RoF system with soliton dispersion management system and the modulation technique employed is 64 QAM/DPSK and the results are analyzed in terms of Q-factor and Bit Error Rate (BER).