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Optical modules are divided into GPON and EPON

Fiber and communications infrastructure knowledge brief Published 08 May 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.

Optical modules in PON networks are classified by technology type (GPON, EPON, XG-PON), power class, and form factor, with each class defining transmission rates, reach, and optical budgets.

GPO

N Optical ModulesGPON (Gigabit Passive Optical Network) modules are designed for high-speed fiber access, supporting downstream rates of 2. 5 Gbps and upstream rates of 1. 25 Gbps.

They are typically installed in Optical Line Terminals (OLTs) at the service provider side and Optical Network Units (ONUs) or Optical Network Terminals (ONTs) at the customer premises.

GPO

N modules are classified according to the ITU-T G. 984 standard, which defines architecture, physical layer specifications, and optical budgets.

Power Classes

Class B+: Optical budget of 28 dB, reach up to 20 km. Class C+: Optical budget of 32 dB, suitable for longer distances or higher split ratios. Class C++: Optical budget of 35 dB, used in dense or extended networks.

Form Factor

Most GPO

N modules use the Small Form-factor Pluggable (SFP) design, allowing hot-pluggability and compatibility with various OLT or ONU devices.

Advanced GPO

N VariantsXG-PON (10G-PON): Supports asymmetric 10 Gbps downstream and 2. 5 Gbps upstream, defined by ITU-T G. 987.

XGS-PON: Symmetrical 10 Gbps upstream and downstream, suitable for ultra-high-speed applications.

EPO

N Optical ModulesEPON (Ethernet Passive Optical Network) modules follow the IEEE 802. 3ah standard, supporting 1. 25 Gbps upstream and downstream.

They are divided into classes such as PX10 and PX20, with 10GEPON modules further classified as PR10, PR20, and PR30 for higher sensitivity and saturation ranges.

EPO

N modules are widely used in enterprise and residential networks where Ethernet compatibility is preferred.

Key Considerations for Module Selection

When selecting a PON optical module, network operators should consider: Compatibility with OLT or ONU devices. Required transmission distance and optical power class. Environmental conditions and temperature range.

Compliance with ITU-T or IEEE standards. SummaryPON optical modules are divided primarily by technology type (GPON, EPON, XG-PON/XGS-PON) and power class, which determines their optical budget and reach.

GPO

N modules are standardized under ITU-T G. 984, while EPON modules follow IEEE 802. 3 standards.

Understanding these classifications ensures proper deployment, optimal network performance, and scalability for broadband fiber access networks.

Optical modules are divided into GPON and EPON - ROGER FIBRE ATELIER [PDF]

Optical modules are divided into GPON and EPON

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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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