The 100G LR1 Single Lambda QSFP28 Optical Transceiver Module is designed for use in 100GBASE Ethernet throughput up to 10km over single mode fiber (SMF) using a wavelength of 1290nm or 1270/1290/1310/1330 via duplex LC connectors. So can be used 4x100G QSFP28 CWDM transceiver and one 4CH CWDM MUX(1270~1330nm) up to 400G transmission on two core fiber(SMF), 2-10KM distance between two Data Center Features Up to 106.25Gbps data rate single channel 1x106.25Gbps PAM4 Line side, 4x25.78Gbps NRZ Host side or 4x26.56Gbps NRZ Host side (close Media-side KP1 FEC inside Module) 100Gbps hermetic TOSA with EML (1271,1291, 1311 or 1331nm)and PIN Detector Dual LC optical interface compliant DDM function implemented Maximum link length of 10km on SMF fiber Low power dissipation: <4W International class 1 laser safety certified Operating temperature range: 0C ~ +70 C Compliant with ROHS6