The artificial intelligence infrastructure boom is not only a story about GPUs, accelerators, memory, power, cooling and real estate. It is also, increasingly, a story about light. As AI clusters become larger, denser and more power hungry, the bottleneck shifts from raw compute alone to the movement of data between processors, racks, data halls and campuses. Electrical interconnects still matter, but the further the AI buildout moves into high-bandwidth, low-latency and energy-constrained architectures, the more optical networking becomes one of the critical hidden layers of the trade.