Lumilens emerged from stealth with more than $700 million in new financing, lifting total capital above $900 million and valuing the startup at $5.51 billion. Co-leads include Atreides, Bain Capital Ventures, Meritech, Seligman Ventures, and Spark Capital. CEO Ankur Singla says the AI bottleneck has moved from buying GPUs to connecting them, because copper dies after about 1.5 meters at AI speeds. The firm says it is already shipping into a hyperscaler's production data centers under a multi-billion-dollar deal. Caveat: the customer and deal size are company claims, and Nvidia plus Broadcom are racing the same photonics market.