Currently, you will find every QSFP transceivers have their own transmitter and receiver types. It helps user to select the appropriate transceiver for each link. It then offers the needed optical reach over multi-mode or single-mode fiber. You will find different categories of QSFP modules in the market today. Some of them are:
1. 4 x 1 Gbit/s QSFP
It consist of four channels which has the capability to carry Gigabit Ethernet, 4GFC (FiberChannel), or DDR InfiniBand. All this information is mentioned on the original QSFP document.