The 400GBASE-DR4 silicon photonics module, MTP/MPO-12 connector, up to 500m over parallel single-mode fiber. It is compliant with QSFP-DD MSA, IEEE 802.3bs protocol and 400GAUI-8 standards. 
The 400 Gigabit Ethernet signal is carried over four parallel lanes by one wavelength per lane. It can be used as a 4x100G breakout to QSFP-DR-100G