As speed and performance needs increase, optical transceivers have become an integral part of overall system design. The transceiver supporting 40G is called the Quad Form-factor Pluggable module. This article will introduce something about QSFP-40G-SR4.
40GBASE-SR4 (“short range”) is a port type for multi-mode fiber and uses 850nm lasers. It’s used for short range fiber connection. Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 802.3 Clause 82 and its Physical Medium Dependent PMD in Clause 86.