Core Logic Summary After Reading: Will yield issues delay “Light into Rack”? No—they will only change the entry method. CPO is soldered in and not repairable; NPO (pluggable) allows field replacement, making it more practical from an engineering standpoint. Regardless of whether CPO or NPO is adopted, laser sources remain essential. Copper cables hit clear physical limits at higher speeds; optical integration into racks is a trend, not an option. The real bottleneck remains InP laser chips, not the optical engine itself. This is why long-term capital is still largely on the sidelines—no one can accurately predict how long the shortage will last. Two risks more significant than yield: China’s CW lasers are oversupplied: Even if not directly entering the U.S. market, they will depress global prices through other channels. Low-power sources like VCSELs: Could bypass the moat around high-power InP lasers. Lumentum itself is investing in this path, indicating the moat is not absolute. Simple Conclusion: Short-term: CPO volume remains limited; contribution to revenue for assemblers like Hon Hai is still minor. Medium-term: NPO will become a practical transitional path, shifting optical engines from “soldered” to “pluggable.” Long-term: InP laser capacity expansion requires 3–5 years; shortages and pricing pressure will persist for some time, but Chinese capacity and alternative technologies remain the biggest uncertainties.