InP substrates technology and investment research

Technical bottleneck

• Bottleneck type: substrate capacity / defect density / qualified supplier base
• Technical constraint: low defect density, stress/slip lines, larger wafer diameter, export permits, qualification cycles
• Economic constraint: qualified supply scarcity; capex for substrate capacity; customer dual-sourcing

Adoption

• Driver: 800G/1.6T, silicon photonics, CPO, AI cluster scale-out bandwidth
• Blocker: alternative materials, CPO delay, customer dual-source normalization

Product categories

InP wafers, epi-ready substrates, lasers, photonic ICs

Public companies exposed

AXTI, COHR, LITE, AAOI

Validation signals

backlog growth; 6-inch InP adoption; hyperscaler LTA/allocation; laser/module tightness

Invalidation signals

capacity normalization; CPO delayed; alternative substrate/material wins

Related product map rows

• LITE — Emerging: AI compute growth → 800G/1.6T optical interconnect demand → InP laser bottleneck → LITE dominant EML/laser supplier sold out through 2027; CPO delay extends pluggable runway · confidence low
• COHR — Emerging: 800G silicon photonics on full allocation; COHR EML lasers = critical component; CPO timing risk flagged (Semi Analysis Computex feedback) but thesis intact short-term · confidence low
• AXTI — Emerging: DIGITAL INFRA: InP substrate bottleneck for 400G/800G silicon photonics and defense/quantum applications; $632M capacity expansion confirms real demand; substrate for LiDAR/sensing also · confidence low
• AAOI — Early: AI compute -> DC buildout -> 800G/1.6T optics bottleneck · confidence low

Public companies exposed

• AAOI (Applied Optoelectronics)
• COHR (Coherent)
• LITE (Lumentum)