$Aehr Test(AEHR)$ $Viavi Solutions(VIAV)$ Optical networking test isn’t one big TAM — it’s TWO different control points in the AI reliability stack. Two companies. Two choke points: • Upstream → Kill defects early (Aehr Test Systems) • Downstream → Validate full AI fabric (VIAVI Solutions) As silicon photonics + CPO scale, spending is splitting: Convex vs recurring Why test intensity is exploding? Optics are moving closer to compute Pluggables → Optical I/O → CPO • TSMC → COUPE (2026) • Broadcom → 200G/lane CPO • NVIDIA → optical inside switches Now ONE defect can break: packaging + fiber + entire racks Cost of escape = 💥 massive Enter Aehr Test Systems (