The development trend of optical modules is higher speed, smaller packages and lower power consumption. As 100G, 200G, 400G and even 800G high-speed optical transceivers are wided used in data center interconnects and other fiber communication applications. Could 100G optical modules with smaller package sizes be developed to increase panel bandwidth density? It has become a common topic for system manufacturers and optical module manufacturers to discuss. 100G optical modules are mainly four channel 100G QSFP28 optical modules or single lambda 100G QSFP28 optical modules. Similar to the 100G QSFP28 single lambda optical transceivers, the SFP112 also uses the single channel optical signal, PAM4 technology, to achieve 100G single channel optical signal transmission. The large-scale application of the SFP112 can achieve interoperability with the current 100G QSFP28 single channel optical module and switch in the future. This forward compatible type is very conducive to network upgrading.