Fast Photonics 100G QSFP28 LR4 Optical transceiver module are designed for 100 Gigabit Ethernet links over 10km single mode fiber. It is a cost-effective, low power optical transceiver with high port densities and compact size. It is operating on Lan-WDM wavelength(1295.5nm/1300nm/1304.5nm/1309nm), compliant with the QSFP28 MSA and IEEE 802.3ba protocol. Digital diagnostics functions are available via the I2C interface, as specified by the QSFP28 MSA.