LONTE QSFP28 ER4 Lite Transceivers (AC-QP-Q3G100-40L) are designed for 100G Ethernet 100GBASE-ER4, 4WDM-40 and OTN OTU4 links over duplex single mode fibers,support transmission distance up to 40km using LWDM wavelengths (1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm).