The 400G QSFP-DD AOC (active optical cable) is a 400 Gb/s parallel active optical cable, which transmits parallel 8×50 Gb/s PAM4 signals over multi-mode fiber (MMF) cables up to 100m. It is compliant with QSFP-DD MSA and the CMIS 4.0. The 400G QSFP56-DD AOC cables supports eight electrical interface lanes, each of which operate in the data rate of 53.125G, with an overall aggregate bandwidth up to 425Gb/s. These modules of cables are designed to operate over multi-mode fiber systems using a nominal wavelength of 850nm.The electrical interface uses a 76 contact edge type connector. AscentOptics provide high performance, high density and low power 400G QSFP-DD active optical cables (AOC), which is suitable for short-range interconnection in data center, high- performance computing networks, enterprise core and distribution layers, and service provider applications.