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Basic Types of Optical Modules

Fiber and communications infrastructure knowledge brief Published 12 Jan 2026

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 can be classified by speed, packaging, laser type, wavelength, and integration technology, ranging from traditional pluggable modules to advanced co-packaged optics.

Traditional Pluggable Optical Modules

Pluggable modules are widely used in Ethernet and SDH networks and are classified by: Data rate: Examples include 100M (100Base), 1G (Gigabit), 10G (10GE), 40G, 100G, and beyond for high-speed networks. Package type: Common packages include SFP, SFP+, XFP, XENPAK, GBIC, and 1x9/SFF.

SF

P and SFP+ are small, hot-swappable modules, while XENPAK and XFP are used for 10G Ethernet. Laser type: Modules may use LED, VCSEL, FPLD, or DFB lasers, depending on distance and application. Wavelength: Typical emission wavelengths include 850nm, 1310nm, and 1550nm, chosen based on fiber type and transmission distance.

Emerging High-

Speed Optical Modules

With the growth of AI computing and hyperscale data centers, next-generation optical modules have emerged: CPO (Co-Packaged Optics): Integrates the optical engine directly with the switch ASIC, reducing electrical signal distance, power consumption, and latency. It is highly energy-efficient but requires new switch designs and cooling solutions.

NP

O (Near-Packaged Optics): Places optics close to the switch chip on the same motherboard, balancing power efficiency with easier deployment compared to CPO.

XP

O (eXtra-dense Pluggable Optics): Maintains a front-panel form factor while scaling throughput up to 12. 8 Tbps per module, offering a transition path for existing hardware.

LP

O (Lightweight Pluggable Optics) and OCS (Optical Circuit Switch): These technologies address ultra-short distance interconnects and network-level optimization in AI clusters and hyperscale data centers.

Optical Module Chips

Modern optical modules rely on optical and electrical chips: Optical chips: Include lasers, modulators, photodetectors, and silicon photonic PICs (SiPh), which are increasingly replacing traditional InP devices. Electrical chips: Include DSPs, SerDes, drivers, and TIAs, supporting high-speed data transmission up to 800G and beyond. Emerging technologies: Thin-Film Lithium Niobate (TFLN) is used for ultra-high-speed modulation in next-generation modules.

Summary

Optical modules are diverse and can be categorized by speed, package, laser type, wavelength, and integration approach. Traditional pluggable modules like SFP, XFP, and XENPAK remain common, while CPO, NPO, and XPO represent advanced solutions for high-speed, low-power, and high-density data center applications. The choice of module depends on network requirements, distance, power efficiency, and deployment flexibility.

Basic Types of Optical Modules - ROGER FIBRE ATELIER [PDF]

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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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