Accelight AQP100C-ER4 optical transceiver is designed for 100G Ethernet links over 40km single mode fiber. It is compliant with QSFP28 Multi-Source Agreement (MSA) and 100G 4WDM-40 MSA. The transmitter integrates 4- EML with center wavelength of 125.96 nm, 1300.05nm, 1304.58nm and 1309.14 nm. The 4 optical signals are multiplexed into one single mode fiber. On the receive side, the four lanes of optical data streams are optically de-multiplexed and each data stream is recovered by a PIN photo-detector and trans-impedance amplifier. It’s a hot pluggable module with CDR integrated, and a serial EEPROM that allows the user to access the monitoring and configuration data via a Two Wire Serial interface (I2C).