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Optical module with the longest range of kilometers

Fibre interconnection and data room reference Published 11 Apr 2026

Use this reference to prepare product questions for FD SOLUCIONES. Check interfaces, capacity, protection and installation requirements against the current product documentation.

The longest-range optical modules currently available are ZX or ER SFP/SFP+ modules capable of transmitting up to 80 kilometers over single-mode fiber.

Long-

Range Optical Module Overview

Optical modules are classified by their wavelength, optical power, and fiber type, which determine their maximum transmission distance. For long-haul applications, single-mode fiber (SMF) is used due to its low attenuation and minimal dispersion over long distances. Modules designed for extended reach include: ZX SFP/SFP+ modules: Support distances up to 80 km using 1550nm wavelength lasers and higher optical power budgets, ideal for metro and regional networks, telecom backbones, and inter-data center links.

E

R (Extended Reach) SFP/SFP+): Typically support 40 km over single-mode fiber at 1550nm, suitable for medium-range backbone connections.

L

R (Long Reach) SFP/SFP+ and QSFP28 LR4: Designed for 10 km over single-mode fiber at 1310nm, commonly used in data centers and enterprise networks.

Technical Considerations

Wavelength: Longer wavelengths (1550nm) experience lower fiber attenuation, enabling longer distances compared to 1310nm modules. Optical Power Budget: Modules with higher transmit power and sensitive receivers can overcome fiber losses, splices, and connector losses to maintain signal integrity over extended distances. Data Rate Compatibility: Long-range modules support various speeds, including 1G, 10G, 25G, and 100G, depending on the module type (SFP, SFP+, QSFP28),.

Environmental Tolerance: Industrial-grade modules can operate in extreme temperatures (-40°C to +85°C), which is important for outdoor or remote deployments. Practical Applications80 km ZX SFP+ modules: Ideal for connecting geographically dispersed data centers or enterprise campuses without intermediate signal regeneration. 10 km QSFP28 LR4 modules: Suitable for high-speed 100G Ethernet links within large-scale data centers.

Intermediate ER/EX modules: Used for backbone or metro networks where distances range from 20 km to 40 km.

Summary

For the longest optical transmission distances, ZX or ER SFP/SFP+ modules operating at 1550nm over single-mode fiber are the top choice, achieving up to 80 km.

L

R modules provide shorter but still significant reach (10 km) and are widely used in high-speed data center networks. When selecting a module, consider fiber type, wavelength, optical power budget, and environmental conditions to ensure reliable long-distance connectivity.

Optical module with the longest range of kilometers - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Optical module with the longest range of kilometers
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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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