ETU-LINK 25G DWDM SFP28 series optical modules are a type of optical module packaged in SFP28 form factor, utilizing Dense Wavelength Division Multiplexing (DWDM) technology. They are primarily used to meet the demands of 5G fronthaul services, enabling long-distance data transmission over single-mode fiber optics. They comply with SFP28 MSA, 25G Ethernet, and CPRI/eCPRI standards. The maximum data rate can reach up to 25.78125Gbps, and the maximum transmission distance can reach up to 15km. They support the full C-band wavelength range (0.8nm spacing, i.e., 100GHz).