Table of Contents
International Scholarly Research Notices
Volume 2014, Article ID 984157, 8 pages
Research Article

Effects of Modulation Techniques (Manchester Code, NRZ or RZ) on the Operation of Hybrid WDM/TDM Passive Optical Networks

1Department of Electronic Engineering, Harare Institute of Technology, Harare, Zimbabwe
2Department of Information Technology, Harare Institute of Technology, Harare, Zimbabwe

Received 19 March 2014; Revised 2 July 2014; Accepted 3 July 2014; Published 30 October 2014

Academic Editor: Meiyong Liao

Copyright © 2014 Kumbirayi Nyachionjeka and Wellington Makondo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this paper, the performance and feasibility of a hybrid wavelength division multiplexing/time division multiplexing passive optical network (WDM/TDM PON) system with 128 optical network units (ONUs) is analysed. In this system, triple play services (video, voice and data) are successfully communicated through a distance of up to 28 km. Moreover, we analysed and compared the performance of various modulation formats for different distances in the proposed hybrid WDM/TDM PON. NRZ rectangular emerged as the most appropriate modulation format for triple play transmission in the proposed hybrid PON.