The 5G fronthaul optical modules are the basic building block of the 5G network. With the further development of 5G, the shortage of optical fiber resources will gradually become prominent, and WDM solutions are desired. There are currently 4 WDM scheme candidates, CWDM, MWDM, LWDM and DWDM, and the debate over this issue continues. We organized the investigation and evaluation of one typical type of 25G optical modules (CWDM) from different vendors. Key parameters of optical/electrical interface have been tested and analysed, including spectrum characteristics, total mean output power, sensitivity, optical path penalty, eye diagram, power consumption as well as DDM function. Current commercial 25G CWDM optical modules are demonstrated capable to support 10 km transmission, covering almost all scenarios of 5G fronthaul.
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