A QSFP-DD optical module uses 8-channel electrical interfaces. The rate of each channel reaches 25 Gbit/s (NRZ modulation) or 50 Gbit/s (PAM4 modulation), providing up to 200 Gbit/s or 400 Gbit/s aggregation solutions. According to different transmission rates, optical modules can be classified into 400 Gbit/s optical modules, 200 Gbit/s optical modules, 100 Gbit/s optical modules, 40 Gbit/s optical modules, 25 Gbit/s optical modules, and 10 Gbit/s optical modules, 2. 25 Gbit/s optical. Huawei offers a comprehensive portfolio of pluggable StarryLink optical modules for data center networks, with various models providing flexible plug-and-play solutions tailored to diverse interface requirements. When used with multimode optical fiber (LC/PC-LC/PC OM2), the transmission distance can reach up to 550 m, the transmission. The Huawei eSFP GE Single‑Mode Module 1310 nm 10 km LC delivers reliable 1 Gbps fiber connectivity for long‑distance networks. Designed for enterprise switches and routers, it supports Digital Diagnostic Monitoring (DDM) for real‑time performance checks and is hot‑swappable for easy installation. However, the maximum power consumption is typically around 12-14 watts per module. 25Gbps with a 1310 nm wavelength, it delivers stable GE connectivity up to 10 km, ideal for enterprise access, metro aggregation, and campus backbones in Asia.