Designed for 400G Ethernet 400GBASE-FR8 links over duplex single mode fibers, theTOPSTAR 400G QSFP-DD FR8 optical module (coming soon) supports transmission distance up to 2km using LWDM wavelengths (1273.55nm, 1277.89nm, 1282.26nm, 1286.66nm, 1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm).