The QSFP-DD 400G DR4 optical transceiver delivers high-performance 400Gbps connectivity for next-generation data center and cloud networks. This advanced module supports 500-meter transmission over single-mode fiber using MPO-12 connectors, making it ideal for spine-leaf architectures and extended-reach applications. The optical transceiver leverages 4×100G PAM4 modulation technology to achieve exceptional signal integrity while maintaining low power consumption (<10W typical). Fully compliant with IEEE 802.3bs and QSFP-DD MSA standards, the QSFP-DD 400G DR4 solution ensures seamless interoperability with major networking equipment. Its built-in digital diagnostics monitoring enables real-time performance tracking, while the compact form factor allows high-density deployments. The optical transceiver is particularly suitable for data center interconnects, AI/ML workloads, and 5G infrastructure where reliable, long-distance 400G connectivity is required. With robust construction and excellent thermal characteristics, this QSFP-DD 400G DR4 module provides a future-proof foundation for high-speed network upgrades.