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

Abstract

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.

Design and investigation of hybrid PON‐FSO system employing modified NZCC code under distinct weather conditions

“…Thereafter, the multi-wavelength signals proceeded for demultiplxing at the corresponding ONU and a receiver section which is employed to detect as well as analysed the designed system's performance in downlink direction same as in TWDM-PON receiver section. 39,40…”

“…At the ONU end in WDM‐OCDMA PON, all downlink signals form CO is then splitted into x parts through a power splitter succeeded by a FSO channel and then signals from x groups are broadcasted to all codded channels for decoding. Thereafter, the multi‐wavelength signals proceeded for demultiplxing at the corresponding ONU and a receiver section which is employed to detect as well as analysed the designed system's performance in downlink direction same as in TWDM‐PON receiver section 39,40 …”