Artificial intelligence is driving a fundamental shift in how datacenter infrastructure is designed and scaled. From large-scale model training to real-time inference, AI workloads are driving unprecedented volumes of data across datacenters. This surge is placing enormous pressure on networking architectures, particularly the optical interconnects that move data between compute nodes. As these demands accelerate, the industry is approaching a critical transition point. The next leap forward is clear: 400 gigabits per second (Gbps) per optical lane.