Fiber to the Home Using a PON Infrastructure

TLDR

Access networks have shifted from voice/text to high‑speed video services, requiring >100 Mb/s symmetric guaranteed bandwidth over 20 km, for which single‑mode fiber and passive optical networks (PONs) are the practical solution. The study evaluates multiple‑access techniques for PONs, focusing on time‑division multiplexing (TDM‑PON) and wavelength‑division multiplexing (WDM‑PON) as the most promising candidates for future systems. TDM‑PON shares a single transmission channel among subscribers in the time domain, while WDM‑PON offers dedicated wavelength pairs for point‑to‑point connectivity. Although TDM‑PON meets current bandwidth demands, projected data‑rate growth and traffic patterns, together with recent WDM advances, suggest WDM‑PON will become the preferred solution for future‑proof fiber access networks.

Abstract

Traffic patterns in access networks have evolved from voice- and text-oriented services to video- and image-based services. This change will require new access networks that support high-speed (> 100 Mb/s), symmetric, and guaranteed bandwidths for future video services with high-definition TV quality. To satisfy the required bandwidth over a 20-km transmission distance, single-mode optical fiber is currently the only practical choice. To minimize the cost of implementing an FTTP solution, a passive optical network (PON) that uses a point-to-multipoint architecture is generally considered to be the best approach. There are several multiple-access techniques to share a single PON architecture, and the authors addressed several of these approaches such as time-division multiple access, wavelength-division multiple access, subcarrier multiple access, and code-division multiple access. Among these multiple techniques, they focus on time-division multiplexing (TDM)-PON and wavelength-division multiplexing (WDM)-PON, which will be the most promising candidates for practical future systems. A TDM-PON shares a single-transmission channel with multiple subscribers in time domain. Then, there exists tight coupling between subscribers. A WDM-PON provides point-to-point optical connectivity using a dedicated pair of wavelengths per user. While a TDM-PON appears to be a satisfactory solution for current bandwidth demands, the combination of future data-rate projections and traffic patterns coupled with recent advances in WDM technology may result in WDM-PON becoming the preferred solution for a future proof fiber-based access network