GIGALIGHT 100G QSFP28 BiDi LR1 single-fiber optical transceiver module is designed for 100G Ethernet links over 10km of single-mode fiber transmission. The module contains a single channel of optical signals operating at 100Gbps data rates. The module can convert four 25Gbps (NRZ) electrical signals to one 100Gbps (PAM4) optical signal or one 100Gbps (PAM4) optical signal to four 25Gbps (NRZ) electrical signals. The electrical interface of the module is compliant with OIF CEI-28G-VSR and QSFP28 MSA.