Buy 40G LR4 singlemode QSFP+ transceivers compatible with various brands including Cisco, Juniper, HP & Netgear. These modules are designed for 10km optical communications applications. They convert 4 input channels of 10GB/s electrical data to 4 CWDM optical signals and multiplexes them into a single channel for 40GB/s optical transmission. On the receiver side, the module optically de-multiplexes a 40Gb/s input into 4 CDWM channel signals and converts them to 4-channel output electrical data.