Introduction and difference of 25G SFP28 SR and SFP28 LR optical modules

25G SFP28 optical module is simply an optical module with a transmission rate of 25Gbps. It is mainly used in 10G/25G Ethernet and 100G (4x25Gbps) Ethernet, which can meet the growing needs of data centers in the most energy-efficient way. Therefore, when the cost of 40G, 100G and other optical modules is too high, the 25G SFP28 optical module has become a good solution. This article will analyze 25G SFP28 SR and SFP28 LR optical modules and their differences.

The SFP28 optical module has the advantages of low power consumption, high port density and saving network deployment costs, and can realize 100Gb/S data transmission through 25Gb/s single-channel physical layer technology. Relatively speaking, the best input or output performance and optical fiber capacity of 25G optical modules are 2.5 times that of 10G optical modules, and can achieve 50G transmission rate through two optical fiber channels. The cost is lower than that of 40G optical modules, and the loss is smaller than 100G optical modules. .

Both 25G SFP28 SR and SFP28 LR optical modules comply with SFP28 MSA, IEEE 802.3cc 25GBASE-LR Ethernet and CPRI/eCPRI standards, and the materials used comply with RoHS environmental protection standards (lead-free), all using hot-swappable SFP28 packages , is a full-duplex transceiver module; the maximum rate is up to 25.78Gbps, dual LC optical ports, operating voltage 3.3V, commercial-grade operating temperature 0-70 degrees, 25G optical modules that support digital diagnostic monitoring DDM functions are widely compatible with Huawei, Cisco, H3C, ZTE, Ruijie, Juniper, Dell, Inter and other major brands of equipment provide cost-effective 25G network solutions.

The difference is: the working wavelength of 25G SFP28 SR optical module is 850nm, the transmission distance through multimode fiber can reach up to 70M (OM3) or 100M (OM4), equipped with VCSEL laser and PIN photodetector, the maximum power consumption is less than 1W, 25G SFP28 SR Optical modules are suitable for short-distance data transmission and can be used in Ethernet switches, routers, network interface cards (NICs) and storage network devices. The 25G SFP28 LR optical module has a working wavelength of 1310nm, and the transmission distance through single-mode fiber OS2 can reach up to 10KM. It is equipped with DFB laser and PIN photodetector, and the receiving channel has a built-in CDR circuit. The maximum power consumption is less than 1.5W, which is mainly suitable for long distances. Data transfer, supporting communication and interconnection applications.