The INTCERA 40G QSFP+ LR4 optical module (GQS-SPO400-LR4CA for 40GE and OTU3, GQS-SPO400-LR4CB for 40GE) supports transmission distance up to 10km using CWDM wavelengths (1271nm, 1291nm, 1311nm, 1331nm). Designed for 40G Ethernet 40GBASE-LR4 links over duplex single mode fibers.