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Optical module with a wavelength of 40km

Fiber and communications infrastructure knowledge brief Published 14 Jan 2026

Prepared for preliminary research by the METRA 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 capable of 40km transmission are available in 10G and 100G variants, using wavelengths such as 1310nm, 1550nm, and CWDM/DWDM channels, suitable for long-reach single-mode fiber networks. 100G Optical ModulesFor high-speed 100G networks, several 40km modules are available: 100G OWDM QSFP28: Supports 8 channels in the O-band (1295. 56nm–1311.

43nm) with 400GHz spacing, reaching 40km without amplifiers or dispersion compensation. It features low power consumption (max 5. 5W) and built-in FEC for reliable transmission, ideal for DCI and metro networks.

100GBASE-ER4L QSFP28: Operates at 1310nm over single-mode fiber, supporting 100G data rates up to 40km with FEC enabled (30km without FEC). Compliant with IEEE 802. 3bm standards, suitable for backbone and enterprise networks.

100G BiDi QSFP28: Enables bidirectional transmission over a single fiber, saving fiber resources while achieving 40km reach. Supports 4x25. 78 Gbps lanes with FEC for robust performance.

10G Optical ModulesFor 10G networks, several 40km modules are widely used: SFP-10G-ER: Uses a 1550nm wavelength over single-mode fiber, supporting 10Gbps up to 40km. Hot-pluggable with LC duplex connectors, it is suitable for metro Ethernet, campus backbones, and data center interconnects. CWDM-10G-SFP-40: Supports 18 CWDM channels (1270–1610nm) with a 16 dB link budget over 40km single-mode fiber.

Multi-rate operation from 1. 25 to 11. 32 Gbps makes it flexible for metropolitan and regional networks.

DWD

M 10G SFP+: Offers C-band 100GHz/50GHz wavelength options, single-mode fiber transmission, and distances up to 40km (with extended options up to 70–80km). Compatible with 10G Ethernet, CPRI, 10GFC, SONET/SDH, and OTN OTU2e protocols.

Key Considerations

Wavelength Selection: 1310nm is common for 100G ER4L modules, 1550nm for 10G ER modules, and CWDM/DWDM modules use multiple channels for wavelength division multiplexing. Fiber Type: All modules are designed for single-mode fiber (SMF) to achieve 40km reach.

FE

C and Link Budget: Forward Error Correction (FEC) is often required to reach the full 40km distance reliably. Connector Type: LC/UPC duplex connectors are standard for these modules. Applications: Suitable for data center interconnects, metro networks, telecom backbones, and enterprise long-reach links.

These modules provide a balance of high bandwidth, long reach, and cost efficiency, enabling scalable and reliable optical networks for modern infrastructure.

Optical module with a wavelength of 40km - METRA FIBER MARKET [PDF]

Optical module with a wavelength of 40km

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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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