The 40G-QSFP-LR4 is a high-performance transceiver module designed for long-range optical communication applications, supporting transmission distances of up to 10 kilometers. It complies with the IEEE P802.3ba 40GBASE-LR4 standard, ensuring reliable and efficient data transmission. The module converts four input channels of 10Gb/s electrical data into four CWDM optical signals, which are then multiplexed into a single channel for 40Gb/s optical transmission. On the receiver side, it de-multiplexes a 40Gb/s optical input into four CWDM channels and converts them back into four channels of electrical data.