CPO & Silicon Photonics — Market

Verified claims and product-axis read for CPO & Silicon Photonics. Every fact below is sourced; every product judgment traces back to underlying signals.

Verified facts

• Celestica's HPS segment operating margin reached ~10% in Q4 FY2024, up from ~6% in FY2022, on AI mix ↗ (financial)
• MACOM's largest customer concentration is II-VI/Coherent at >10% of revenue per 10-K disclosures ↗ (financial)
• MACOM Q3 FY2025 data center revenue exceeded $50M, up from $30M YoY, driven by 200G PAM4 components ↗ (financial)
• Lumentum's R&D spend reached ~16% of revenue in FY2025, weighted toward cloud/AI laser portfolio ↗ (financial)
• Coherent's annual CapEx guided $250M-$300M for FY2026 with majority on InP and SiPh capacity ↗ (financial)
• Celestica's Joint Design Manufacturing revenue mix grew above 35% of HPS in 2024 from <20% in 2021 ↗ (financial)
• Ayar Labs added Nautilus Venture Partners and Lockheed Martin Ventures to its cap table by 2024 ↗ (other)
• Lumentum disclosed that its ELS module for CPO uses a hermetically sealed multi-channel DFB array with sub-100 kHz linewidth ↗ (other)
• Ayar Labs claimed CPO TCO advantage over pluggables emerges only at >4 km reach or >800G/port in customer benchmarks ↗ (other)
• Celestica's Honeywell-derived hardware platform team has design wins at three hyperscalers for AI server racks ↗ (other)

Top products (engine read)

Ayar Labs TeraPHY Optical I/O Chiplet — optical I/O chiplet

Opportunity: Scale-up GPU domains beyond a single rack — copper SerDes runs out at multi-rack distances and pluggable optics burn too much power at chiplet edge; in-package optical I/O is the alternative to expand the coherent compute domain.

TeraPHY is the canonical 'optical I/O at the package' product in the topic. NVIDIA strategic check + Wiwynn 1024-GPU demo + monolithic GF process = strongest non-switch CPO play. Open question is whether merchant accelerators (vs NVIDIA's own integrated photonics) actually adopt it in volume.

NVIDIA Quantum-X Photonics CPO Switch — switch

Opportunity: Scale-up InfiniBand fabrics for AI GPU clusters need lower-power, higher-radix switches; CPO replaces pluggables to cut optical power at 100+ Tbps switch radix.

Quantum-X is the flagship CPO product in the topic — NVIDIA is the demand anchor, TSMC COUPE is the SiPh process, and Coherent/Lumentum are locked in as ELS suppliers. The architecture (multiple SiPh engines per switch ASIC + remote DFB lasers) is now the de-facto CPO reference design others must match.

NVIDIA Spectrum-X Photonics CPO Ethernet Switch — switch

Opportunity: Hyperscaler Ethernet scale-out fabrics need 1.6T-per-port radix without paying full pluggable-optics power budget; CPO is the bet to land it at 102.4T.

Spectrum-X CPO is the Ethernet sibling to Quantum-X and pulls the same supplier stack (Lumentum + Coherent ELS). H2 2026 shipment timing makes 2025-2026 the supplier qualification window — laser, fiber attach and packaging vendors that miss it lose two years.

Broadcom Bailly 51.2T CPO Switch (TH5) — switch

Opportunity: Pluggable optics power is the wall at 51.2T+ switch radix; Broadcom's 50% optical power reduction quantifies the CPO value prop hyperscalers buy on.

Broadcom is the merchant-silicon CPO leader competing with NVIDIA's vertically integrated stack. Bailly's public demo + concrete power-savings number is the case study hyperscalers cite when greenlighting CPO procurement.

See the Products and Strategy modules for the full product list and forward-looking judgment.