400G QSFP-DD transceivers have four optical lanes that operate at 100Gbps PAM4 modulation, providing solutions up to 400 Gbps. The transceivers have electrical side 8 lanes of 53.125Gbps PAM4. They are compliant with the QSFP-DD MSA. Digital diagnostics functions are available via the I2C interface, as specified by CMIS.

400G QSFP-DD SR8 is a QSFP-DD optical transceiver for 400G links over multimode fiber. It is compliant with the QSFP-DD MSA specifications. It operates at 53.125Gbps per lane up to 70m over OM3 and 100m OM4 Multi-mode fiber.

400G QSFP-DD DR4 is a QSFP-DD optical transceiver for 400G links over singlemode fiber. It is compliant with the QSFP-DD MSA specifications. It operates at 53.125Gbps per lane up to 500m on 1310nm wavelength.

400G QSFP-DD FR4 is a QSFP-DD optical transceiver for 400G links over singlemode fiber. It is compliant with the QSFP-DD MSA specifications. It operates at 53.125Gbps per lane up to 2KM on CWDM4 wavelength.

400G QSFP-DD LR4 is a QSFP-DD optical transceiver for 400G links over singlemode fiber. It is compliant with the QSFP-DD MSA specifications. It operates at 53.125Gbps per lane up to 10KM on CWDM4 wavelength.

400G QSFP-DD ER4 is a QSFP-DD optical transceiver for 400G links over singlemode fiber. It is compliant with the QSFP-DD MSA specifications. It operates at 53.125Gbps per lane up to 40KM on PAM4 wavelength.