25G SFP28 is the mainstream 25G hot-pluggable optical transceiver defined by SFF-8636 MSA standard, widely deployed in 5G fronthaul, cloud data center ToR switches and 100G QSFP28 breakout interconnection. This article fully sorts all mainstream 25G SFP28 models, technical parameters, fiber matching rules and typical application scenarios for network procurement and engineering deployment.

Ⅰ. Basic Introduction to 25G SFP28 Optical Module

25G optical module is an optical module with a transmission rate of 25Gbps, which is mainly used in 25G Ethernet and 100g (4×25Gbps) Ethernet. Encapsulated as SFP28, its function is to interconnect servers and switches in the data center.

With the rapid development of the Internet, cloud computing and big data, the construction of IT infrastructure data centers is further accelerated, among which 25G SFP28 SR optical modules and 25G SFP28 LR optical modules are favored for their ability to provide cost-effective 25G and 100G network solutions. The center of the majority of users of all ages. Next, ETU-LINK will show you 25G SFP28.

Ⅱ. Full Series Classification & Complete Parameter Table of 25G SFP28

At present, the common ones are 25G SFP28 SR, 25G SFP28 LR, 25G SFP28 ER, 25G SFP28 CWDM, 25G SFP28 DWDM, 25G SFP28 BiDi. The above product parameters can be seen in the table form.

All ETU-LINK 25G SFP28 modules comply with IEEE 802.3by 25G Ethernet and CPRI/eCPRI 5G fronthaul standards, divided into commercial temperature (0~70℃) and industrial temperature (-40~85℃) versions, compatible with mainstream brand SFP28 ports.

Ⅲ. Detailed Explanation of Each 25G SFP28 Model

1. Short-Reach Multimode: 25G SFP28 SR

25G SFP28 conventional optical modules include SR, LR, and ER. The 25G SFP28 SR optical module is a 25G optical module with a working wavelength of 850nm. Its internal transmitter is a vertical cavity surface emitting laser. Therefore, it needs to be used with 50/125µm OM3/OM4 multimode fiber. The transmission distance is 70 meters when used with OM3 and 100 meters when used with OM4.

Applicable scenario: Short-distance interconnection within data center cabinets, server ToR switch direct connection, matched with OM4 high-bandwidth multimode patch cord; Low cost, no need for single-mode fiber wiring, the first choice for new cloud computing server rooms.

2. Medium/Long Single-Mode Duplex: 25G SFP28 LR & ER

25G SFP28 LR and 25G SFP28 ER are single-mode optical modules, which need to be used together with single-mode optical fiber patch cord OS2.

25G SFP28 LR adopts DFB laser, 1310nm wavelength, maximum 10km transmission, used for campus aggregation layer cross-building links and medium-distance 5G fronthaul;
25G SFP28 ER extends the link budget to 40km, suitable for suburban base station long-distance fiber interconnection and MAN edge node convergence.

3. Wavelength Division Multiplexing Color Modules: CWDM & DWDM SFP28

25G SFP28 color optical module includes CWDM SFP28 optical module, DWDM SFP28 optical module, and the working wavelength of 25G CWDM SFP28 optical module is 1271-1331nm. It is mainly used in the 5G fronthaul bearer network, and can be transmitted up to 10 kilometers through single-mode fiber OS2.

4. Single-Fiber Bidirectional: 25G SFP28 BiDi
25G BiDi SFP28 uses 1270nm/TX & 1330nm/RX wavelength pair, completes sending and receiving on only one single-mode fiber, cutting fiber usage by half. Must be used in paired TX/RX matching modules, supports up to 40km OS2 fiber transmission, the most cost-saving solution for sparse 5G base station deployment with limited fiber resources.

Ⅳ. Supporting Matching Accessories for 25G SFP28
ETU-LINK complete matching accessories:
Fiber patch cord: OM3/OM4 multimode LC duplex for SR; OS2 single-mode LC duplex/simplex for LR/ ER/ CWDM/ BiDi;
Interconnection cable: 25G SFP28 passive DAC / 5-10m AOC active optical cable for cabinet stacking;
WDM equipment: 8/16 channel CWDM MUX/DEMUX matching CWDM SFP28 fronthaul deployment;
All 25G SFP28 transceivers support DDM optical power real-time query via switch CLI commands.

Last updated: July 22, 2026