Views: 599 Author: Anna Publish Time: 2026-05-07 Origin: Site
The SFP-25G-LR optical module (SFP28 1310nm 10km) is a high-performance long-distance data communication module. It features an SFP28 package, 25G data rate, 1310nm wavelength, a transmission distance of 10km, an LC interface, and supports operating temperatures from 0-70 degrees Celsius. The SFP-25G-LR optical module boasts stable performance, low power consumption, and strong compatibility, making it ideal for use in 25G Ethernet switches, routers, network interface cards, and storage network devices.
The core positioning of the SFP28 25G LR optical module is to address the transmission requirements of "medium-distance, high-speed" connections. It supports a data rate of 25.78 Gbps and can stably transmit over 10 kilometers on single-mode fiber. Compared to traditional 10G modules, the bandwidth is increased by 2.5 times, effectively alleviating bandwidth pressure in enterprise networks or metropolitan area network access scenarios; while compared to 40G or 100G solutions, its deployment cost and power consumption are significantly lower. Therefore, it has become a practical choice balancing performance and cost in scenarios such as campus building interconnection, 5G base station fronthaul, and data center edge access.
These modules use single-mode fiber as the transmission medium and operate within the 1310nm wavelength window. The core diameter of single-mode fiber is only 9 micrometers, allowing only one mode of light to propagate, fundamentally eliminating the modal dispersion problem common in multimode fibers. Simultaneously, the 1310nm band falls within the region of low dispersion in fiber materials, making pulse broadening less likely after long-distance transmission. The combination of these two factors allows 25G high-speed signals to maintain a clear waveform within a 10-kilometer range, eliminating the need for additional dispersion compensation devices.
To support a 10km transmission distance, the SFP28 25G LR uses a DFB (Distributed Feedback) laser instead of the VCSEL laser commonly found in short-range modules. The DFB laser integrates a grating structure, enabling it to output a stable wavelength and extremely narrow spectral width optical signal, less susceptible to temperature variations and operating current fluctuations. This characteristic is crucial for long-distance single-mode transmission—a stable wavelength means less dispersion accumulation, allowing the receiver to more reliably recover the original data.
In 25G high-speed transmission, jitter and distortion are inevitable after the signal travels 10km through fiber. The SFP28 25G LR module integrates a CDR (Clock Data Recovery) circuit in both the transmit and receive paths. This circuit can extract the clock from the received data stream and reshape and regenerate the data signal. Signal jitter is significantly reduced after CDR processing, ensuring accurate data decoding by backend switches or servers. This design is particularly important for stable communication across devices and data centers.
This module generally supports DDM/DOM digital diagnostic monitoring functions. The network management system can read key parameters such as module temperature, voltage, bias current, transmit optical power, and receive optical power in real time. By observing whether the receive optical power decreases or the bias current increases abnormally, maintenance personnel can proactively troubleshoot and replace components before issues such as fiber optic connector contamination or laser aging actually cause link interruptions. This maintainability is especially valuable for long-distance links deployed in remote locations or outdoor cabinets.
For scenarios without temperature control, such as deployments on 5G base station tower tops or outdoor integrated cabinets, standard commercial-grade (0℃ to 70℃) modules often fail to meet requirements. Therefore, some manufacturers offer industrial-grade wide-temperature versions of the SFP28 25G LR module, with an operating range extending from -40℃ to 85℃. At high temperatures, the module's internal control circuitry dynamically adjusts the laser's operating parameters to prevent power attenuation or wavelength drift due to temperature increases; in low-temperature environments, it also ensures normal startup and stable emission. This makes the wide-temperature model the preferred solution for outdoor communication equipment.
In 5G mobile communication networks, base station architecture is typically divided into AAU (Active Antenna Unit), DU (Distributed Unit), and CU (Centralized Unit). The link between AAU and DU is called fronthaul, and the link between DU and CU is called midhaul. Both links have high requirements for bandwidth and latency; typical bandwidth requirements have increased from 10G in the 4G era to 25G. The SFP28 25G LR module, with its 10km transmission distance, can cover most urban areas for remote base station deployment scenarios. It also supports the eCPRI protocol, naturally matching the 5G fronthaul interface standard. Operators can smoothly upgrade their existing 10G links to 25G without replacing the backbone fiber, thus meeting the urgent bandwidth demands of 5G services.
Large enterprise campuses typically contain multiple office buildings, data centers, conference centers, etc., and the networks between these buildings require outdoor fiber optic connections. Traditional solutions often use gigabit or 10-gigabit links, but with the widespread adoption of applications such as 4K video conferencing, VDI virtual desktops, and large-scale cloud desktops, bandwidth pressure is increasingly prominent. The SFP28 25G LR module can be directly deployed between the core switch of the campus and the aggregation switches of each building, utilizing existing single-mode fiber resources to achieve high-speed 25G interconnection between buildings. Because the module uses an SFP28 package, it is physically compatible with existing SFP+ ports, allowing enterprises to gradually upgrade link bandwidth as needed while protecting existing investments.
In small and medium-sized data centers or edge computing nodes, server rooms are often not entirely concentrated in a single building. For example, two server rooms within the same data center may be hundreds of meters to two or three kilometers apart, or a high-bandwidth link needs to be established between the main data center and a backup server room in the same city. In such cases, the SFP28 25G LR is a very economical choice. Compared to 40G or 100G solutions, the 25G LR module has lower procurement costs and lower power consumption. Through link aggregation technology, multiple 25G physical links can be bundled into a single 50G or 100G logical link, meeting bandwidth requirements while maintaining low initial investment and operating costs.
Metropolitan Ethernet is the primary technology used by operators to provide leased line access to enterprise customers. Between access layer and aggregation layer devices, operators need to aggregate a large amount of user traffic to the upper-layer network. Previously, this segment primarily used 10G links. However, as enterprise bandwidth packages evolve to 1G, 2G, and even higher, 10G uplink ports are beginning to experience congestion risks. The SFP28 25G LR module can be deployed on the operator's aggregation switch, increasing the bandwidth of a single uplink to 25G. Simultaneously, a transmission distance of 10 kilometers is sufficient to cover common distances within a city from the user-side access point to the central office aggregation point, eliminating the need for additional repeater equipment.
In city-level high-definition video surveillance systems, video streams captured by front-end cameras are first aggregated to street or area nodes, and then transmitted to the central control room via backbone fiber. With the widespread adoption of 4K and 8K cameras, the total bandwidth requirement for a single node has increased from the hundreds of megabits to gigabit or even 10 gigabit levels. The SFP28 25G LR module is suitable for fiber optic links between backbone nodes, efficiently transmitting video data from multiple area nodes back to the monitoring center. Since monitoring nodes are often deployed outdoors or in unattended low-voltage wells or utility poles, the module's supported digital diagnostics (DDM) function can help maintenance personnel remotely check optical power and module operating status, detect fiber optic aging or interface contamination issues in advance, and reduce the workload of routine inspections.
