OTU4 111.8G series are new generation of 111.81G transceiver modules solution based on QSFP28 form factor. They are designed for 100 Gigabit Ethernet and 4x28G OTN client interfaces over single-mode fiber.  The Gigaopto 100G OTU4 QSFP28 series optical transceiver includes LR4, ELR4, ER4 and other series. All 100G transceivers comply with the QSFP28 MSA, CE, FCC, Reach, and RoHS standards.