Our 400GBASE-DR4+ QSFP-DD transceiver enables extended-reach parallel connectivity for data center interconnects. Supporting 2km over single-mode fiber with 4x1310nm parallel optics using PAM4 modulation, this module delivers 4 dB link budget at 425 Gbps aggregate throughput. Each fiber pair link is compliant to 100GBASE-FR1 and thus can support a 400GE to 4x 100GE breakout over 2 km. 5625 GBd PAM4 electrical. dule retimed interface (see IEEE 802. Each optical lane is. We provide an industrial-grade reference framework, complying with the latest MSA (Multi-Source Agreement) updates, including SFF-8679 Rev 1. 4 (Jan 2025), to help you design robust, scalable optical fabrics. The Master Reference Matrix: SFP vs. The JFOPT QSFP-DD 400G (4x100G) 1310nm 2km FR4 LC DX transceiver is a high-performance 400Gb/s Quad Small Form Factor Pluggable-double density (QSFP-DD) optical module designed for optical communication applications over distances of up to 2km. The hidden message of the QSFP-DD craze is not the physical.