This 400G QSFP112 SR4 optical transceiver is a high-performance pluggable module designed for short-reach interconnection in data centers, AI training clusters and 5G bearer networks. Adopting 4-channel full-duplex transmission and PAM4 modulation technology, it operates at 850nm wavelength with VCSEL/PD array, delivering 400G aggregate bandwidth over 60m OM3 or 100m OM4/OM5 multimode fiber. Compliant with mainstream industry standards including QSFP112 MSA and IEEE 802.3ck, the module features hot-pluggable design, low power consumption (≤8W) and built-in digital diagnostic monitoring, ensuring reliable, efficient and easy-to-manage high-speed data transmission. With MPO12 connector, it perfectly fits high-density cabling requirements of modern data centers, providing a cost-effective solution for leaf-spine architecture interconnection and server-to-TOR short-range links.