Carry 100 GbE farther with LR4 QSFP28 optics built for long-reach single-mode fiber. This module is suited to backbone links, inter-row connections, and campus transport where short-reach optics would fall short and long-distance stability matters. The QSFP28 form factor keeps the footprint compact while delivering the bandwidth required for modern core and aggregation designs. With 1310 nm operation and a 10 km reach, LR4 is a strong fit for environments that need to span larger physical distances without changing the network architecture or adding unnecessary conversion layers. For infrastructure teams, LR4 is often the right economic choice when the link must travel beyond the data hall. It avoids the cost and complexity of overbuilding with higher-reach optics while still preserving 100 GbE performance. That makes it a practical standard for campus backbones, metro-adjacent facilities, and distributed data center designs that depend on consistent transport over single-mode fiber.