Accelight’s (AQDQDA400Cxxx) QSFP-DD AOC is designed for use in 400 Gigabit Ethernet links over 30m. Each of AOC modules has 8 independent electrical input/output channels operating at 53.125Gbps per channel. Each of AOC modules consists of two transmitter/receiver units. The transmitter path of the module incorporates a bi-directional PAM4 retimer ASIC integrated with two 4-channel drivers, two 4-channel VCSEL arrays laser. On the receiver path, 8 photodiodes and two 4-channel TIA arrays, along with the PAM4 re-timer. The electrical interface of the module is compliant with the 400GAUI-8 interface and compliant with QSFP-DD MSA.