Passive Optical Networks: Introduction

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Abstract
Passive optical networks (PONs) are telecommunication networks that provide services to users by no active elements. Only passive elements are used in the network to transmit the information and signals between users as well as between users and the companies operating the telecommunication networks.PONhave evolved from their infancy as fine and economical ideas, toward a long‐term, reliable, and cost‐effective technical solutions for providing access to most users to high‐speed Internet by Fiber‐to‐the‐Home (and similar) solutions.PONare still evolving, providing the base of multiple standardized networks and in combination with different technologies are growing into metropolitan networks and extensions of mobile communications.Herein, we overview the state of the art of passive optical networks as well as their basic concepts. This work is divided into four sections: In Section 1, we give a summary of the main concepts of passive optical networks. Sections 2 and 3 introduce the most important features ofITU‐TRecommendations andIEEEStandards for passive access networks, respectively. Finally, Section 4 concludes the article with an overview on the future trends ofPONsfor access networks.

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