The 400G QSFP112 DR4 represents a cutting-edge optical transceiver solution designed for next-generation data center interconnects and high-performance networking applications. Built in the compact and hot-pluggable QSFP112 form factor, this high-speed module delivers exceptional 400Gbps data transmission over single-mode fiber (SMF) with an extended reach of up to 500 meters, making it ideal for medium-range connections within and between data center buildings. Utilizing an MPO-12 optical interface, the optical transceiver ensures reliable and high-density connectivity while maintaining superior signal integrity for demanding 400G Ethernet applications. The 400G QSFP112 DR4 operates on four parallel 100G lanes using PAM4 modulation technology, providing optimal performance for hyperscale data centers, cloud computing infrastructure, and 5G network deployments. Its advanced design incorporates power-efficient components and robust thermal management to support continuous operation in high-temperature environments. Compliant with industry standards including IEEE 802.3bs and QSFP112 MSA, this transceiver offers seamless interoperability with existing network equipment while future-proofing infrastructure for emerging bandwidth demands. With its combination of extended reach, high bandwidth density, and energy efficiency, the 400G QSFP112 DR4 stands as a versatile solution for modern data center operators seeking to upgrade their optical networks without compromising on reliability or scalability.