100G CFP2 ER4 optical Transceiver integrates receiver and transmitter path on one module. In the transmit side, four lanes of serial data streams are recovered, retimed, and passed to four laser drivers. The laser drivers control four EMLs (Electric-absorption Modulated Lasers) with center wavelength of 1296 nm, 1300nm, 1305nm and 1309 nm. The optical signals are multiplexed to a single –mode fiber through an industry standard LC connector. In the receive side, the four lanes of optical data streams are optically demultiplexed by the integrated optical de-multiplexer. Each data stream is recovered by a PIN photo-detector and transimpedance amplifier, retimed. This module features a hot-pluggable electrical interface, low power consumption and MDIO management interface.