25G SFP28 LAN-WDM 40km Duplex LC Single-Mode Fiber Transceiver

The 25G SFP28 LAN-WDM 40km Optical Transceiver is a long-reach optical module designed for 25G Ethernet and other high-speed single-mode fiber applications. Supporting data rates up to 25.78Gbps and transmission distances of up to 40km, it combines a cooled DML laser transmitter with an APD photodiode and integrated TIA receiver to provide reliable optical transmission and high-sensitivity signal reception over extended-distance links. The LAN-WDM architecture is designed for wavelength-specific optical networking where stable transmission performance and efficient fiber utilization are required.

Built in a compact hot-pluggable SFP28 form factor, the transceiver features a Duplex LC optical interface and single +3.3V power supply for convenient integration into compatible switches, routers, and telecom equipment. SFF-8472-compliant Digital Diagnostic Monitoring provides access to module operating information for network management and troubleshooting. With its 40km reach and long-distance optical design, it is suitable for 25G Ethernet, telecom transport, metro networks, and other extended-reach optical deployments.

25G SFP28 LAN-WDM 40km Mechanical Spec

   

• Supports data rates up to 25.78Gbps
• Transmission distance of up to 40km
• LAN-WDM optical technology
• Designed for single-mode fiber transmission
• Cooled DML laser transmitter
• APD photodiode with integrated TIA receiver
• Standard hot-pluggable SFP28 form factor
• Duplex LC optical interface
• Single +3.3V power supply
• Supports real-time Digital Diagnostic Monitoring
• SFF-8472-compliant management interface
• Suitable for long-distance 25G optical links
• Class I laser safety compliant
• Designed for high-density network equipment

• 25GBASE-ER Ethernet networks
• Long-distance 25G Ethernet
• Telecom transport networks
• Metro Area Networks (MAN)
• Network aggregation links
• Data center interconnection
• Long-distance switch-to-switch connectivity
• Router-to-router optical links
• 25G single-mode fiber network expansion

FiberMania provides OEM and customized manufacturing services for 25G SFP28 LAN-WDM optical transceivers. Customization can include wavelength or channel configuration, host equipment compatibility, EEPROM coding, DDM parameters, product labeling, housing identification, packaging, and other project-specific requirements.

For LAN-WDM network deployments, customers can provide their optical channel plan, target networking equipment, or existing transceiver specifications for compatibility evaluation. Sample units can be supplied for testing with switches, routers, telecom platforms, and other 25G optical equipment before volume production.

Q1. What is LAN-WDM and how is it different from conventional CWDM?

LAN-WDM uses a group of closely spaced wavelengths optimized for high-speed Ethernet transmission, while conventional CWDM generally uses wider wavelength spacing. The tighter wavelength arrangement of LAN-WDM is particularly suitable for high-speed data transmission where multiple wavelength channels need to be carried over shared fiber infrastructure.

Q2. Is the 40km transmission distance guaranteed for every installation?

No. The 40km rating represents the designed maximum reach under suitable optical conditions. Actual performance depends on fiber attenuation, connector and splice losses, dispersion, optical power budget, and the characteristics of the equipment at both ends of the link. A complete link-budget calculation is recommended for long-distance deployments.

Q3. Why does this 40km module use an APD receiver?

An APD receiver provides higher optical sensitivity than a conventional PIN receiver, making it suitable for applications where the received optical signal becomes relatively weak after long-distance transmission. This helps support the extended reach required for 40km-class 25G optical links.

Q4. What is the advantage of using a cooled DML laser?

A cooled DML laser provides improved control of the transmitter’s optical characteristics across temperature variations. This is useful in long-distance and wavelength-specific applications where stable optical performance is important for maintaining reliable communication.

Q5. Can this transceiver be used with LAN-WDM MUX/DEMUX equipment?

It can be integrated into compatible LAN-WDM optical systems, but the transceiver’s wavelength must match the corresponding channel of the optical MUX/DEMUX. The complete optical system should also be evaluated for insertion loss, channel compatibility, and available optical power budget before deployment.

Q6. Can the module be customized for a specific 25G network platform?

Yes. FiberMania can provide customized EEPROM coding, host identification, wavelength/channel configurations, labeling, and packaging for qualified B2B projects. Customers can provide their target switch, router, or telecom equipment model for compatibility evaluation.