ATOP 100G QSFP28 LR4 transceiver supports a link distance of 10Km on standard single-mode fiber, and is used together with LC single-mode fiber jumpers. It adopts a design of 4 LAN-WDM lanes for MUX/DEMUX and hot-pluggable QSFP28 packaging, which has 4 independent full-duplex channels that can transmit up to 25Gbps data rate per wavelength. This module has a power dissipation is < 4.5W, and can be operated from 0℃ to 70℃. It can be applied to 100G BASE LR4 and 100G Ethernet applications.