Lasers, Optics & Photonics

Biography

Biography: Reginaldo Barbosa Nunes

Abstract

The need for high bandwidth networks driven by new digital services and technologies has culminated in the emergence of the new standards for passive optical networks (PONs) such as 10 Gigabit Capable PON (XGPON) recommended by the ITU-T (International Telecommunications Union - Telecommunications) and 10 Gigabit Ethernet PON (10G EPON) standardized by the IEEE (Institute of Electrical and Electronic Engineers), both provide rates up to 10 Gb/s per wavelength to the end user. More recently, the ITUT standard NGPON2 started using TWDM technology that provides rates up to 40 Gb/s, but for that, it needs to use four wavelengths. In this context, this we propose a PON architecture based on Orthogonal Frequency Division Multiple Access (OFDMA), capable to off er an effi cient bandwidth control with greater fl exibility and granularity in bandwidth allocation to the end users according their demand or required Quality of Service (QoS). Th e proposed architecture exploits the Orthogonal Frequency Division Multiplexing (OFDM) to provide transmission rates above 33 Gb/s per wavelength. Th e proposal considers a tree topology where each optical line terminal (OLT) is connected to at least one passive device splitter/combiner, provides multiple services for up to 32 optical network units (ONUs). Our work presents experimental results that demonstrate the feasibility of this physical infrastructure for passive optical network based on OFDM/OFDMA, suggests adaptations in the architecture and presents techniques for improving the system spectral effi ciency. In addition, it also describes the main recommendations to build a medium access layer in accordance with this proposal, named BS OFDMA PON (Bandwidth Scalable OFDMA PON).