Accelight ACP4C-LR4 optical transceiver is designed for 100G links over 10km single mode fiber. It is compliant with IEEE 802.3 ba 100GBASE-LR4 and ITU-T G.959.1, CFP MSA CFP4 Hardware Specification, CFP MSA Management Interface Specification Rev. 2.2, and OIF CEI-28G-VSR standards. The transmitter integrates 4 EMLs with center wavelength of 1295.96 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 has a built-in CDR, and a MDIO management interface compliant with IEEE 802.3 Clause 45, and the CFP MSA CFP4 Hardware Specification.