Buy 100G LR4 singlemode QSFP28 transceivers compatible with various brands including Cisco, Juniper, HP & Netgear. These modules are designed for 10km optical communication applications over singlemode fibre via duplex LC connectors.
They convert 4 x 25G input channels of electrical data to 4 lanes of optical signals and multiplex them into a single channel for 100Gb/s optical transmission. On the receiver side the module optically de-multiplexes a 100GB/s input into 4 lanes and converts them to 4 lane electrical data.