OM4 is a high-performance 50/125 μm multimode fiber (MMF) optimized for short-distance, high-speed data transmission, supporting up to 100Gbps over 150m and 40Gbps over 550m with low attenuation and high effective modal bandwidth. It is widely used in data centers, enterprise LANs, and campus networks, offering reliable connectivity for high-density, short-haul applications while ensuring backward compatibility with OM3 infrastructure.