As the AI infrastructure story presents new investment opportunities, Neena Mishra of Zacks Investment Research points to photonics companies as one of the largest. The space includes everything from photonics-centric stocks like Lumentum (LITE) and Coherent (COHR) to chipmakers with less exposure like Nvidia (NVDA) and Broadcom (AVGO). Neena highlights photonic ETF opportunities she sees.