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Functions of each part of a passive optical network

Fiber and communications infrastructure knowledge brief Published 19 Jun 2024

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

A passive optical network consists primarily of an Optical Line Terminal (OLT), passive optical splitters, and Optical Network Units (ONUs) or Optical Network Terminals (ONTs). Optical Line Terminal (OLT)The OLT is located at the service provider's central office or hub and serves as the network's control and management point. It generates and transmits optical signals downstream to multiple end users and receives upstream signals from them.

The OL

T also manages bandwidth allocation, traffic scheduling, and network monitoring, ensuring efficient communication across the shared fiber infrastructure.

Passive Optical Splitters

Passive optical splitters are unpowered devices that divide a single optical signal from the OLT into multiple signals to serve many subscribers. They operate without electricity, using physical principles like reflection and refraction to split light. Splitters can be deployed in a centralized configuration (directly connected to the OLT) or cascaded (multiple stages connecting to additional splitters), supporting typical split ratios such as 1: 32 or 1: 64.

This passive design reduces operational costs and simplifies deployment. Optical Network Units (ONUs) / Optical Network Terminals (ONTs)ONUs or ONTs are located near or at the end-user premises. They convert optical signals back into electrical signals for devices like computers, phones, or set-top boxes.

ON

Ts also filter and decrypt downstream data intended for their specific subscriber, ensuring secure communication over the shared fiber network.

Fiber Optic Cabling

The fiber optic cables form the physical backbone of the PON, connecting the OLT to splitters and ONUs/ONTs. These cables carry high-speed optical signals over long distances with minimal loss, enabling efficient point-to-multipoint communication.

Optional Components

While the core PON is passive, some networks may include amplifiers or wavelength-division multiplexing (WDM) devices to extend reach or increase capacity. However, these are not required for the basic passive operation. In summary, the OLT, passive optical splitters, and ONUs/ONTs form the essential components of a PON, enabling high-speed, cost-effective, and reliable fiber-optic connectivity from a single provider to multiple end users without requiring powered devices in the distribution network.

Functions of each part of a passive optical network - ROGER FIBRE ATELIER [PDF]

Functions of each part of a passive optical network

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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