The QSFP-DD 400G SR4 optical transceiver represents a cutting-edge solution for next-generation data center connectivity, delivering exceptional 400Gbps bandwidth through its advanced MPO-12 multimode fiber interface. This high-performance optical transceiver leverages 4×100G PAM4 modulation technology to achieve reliable 100-meter transmission, making it ideal for high-density server interconnects and top-of-rack deployments in modern data centers. Designed for efficiency, the QSFP-DD 400G SR4 module features low power consumption (<10W typical) while maintaining full compliance with industry standards including IEEE 802.3cm and QSFP-DD MSA specifications. Its compact form factor enables superior port density in network switches and routers, while the built-in digital diagnostics monitoring (DDM) capability provides real-time visibility into critical performance parameters. The optical transceiver excels in demanding applications such as AI/ML workloads, high-performance computing clusters, and hyperscale cloud environments where its combination of high bandwidth and short-reach connectivity delivers optimal value. With hot-pluggable functionality and robust signal integrity, this QSFP-DD 400G SR4 solution simplifies network upgrades while ensuring reliable operation in mission-critical infrastructure. Whether deployed in enterprise data centers or large-scale cloud facilities, this optical transceiver offers a future-proof foundation for 400G Ethernet deployments, balancing performance, density and power efficiency for today's most demanding networking environments.