100G, 40G, 25G, 10G, 2.5G, 100M and mobile fronthaul networks for metropolitan area networks and access networks have corresponding metropolitan area network and access network optical modules. Among them, CFP/CFP2/CFP4 and QSFP28 SFP transceiver modules are suitable for 100G, QSFP+ transceiver modules are used for 40G networks, and 25G SFP28 optical transceiver modules are the first choice for 25G networks. 100M, 2.5G, 10G SFP modules and mobile fronthaul optical SFP modules are available in a variety of packages.