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COMPANY RESEARCH / TSEM

Tower Semiconductor

Silicon-photonics foundry for 800G/1.6T optics

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Where it fits in an AI server rack

Tower’s 2025 Form 20-F says its PH18 (200 mm) and PH45 (300 mm) silicon-photonics platforms, in high-volume production, benefited from AI-driven growth in optical interconnects and lead the 400G–1.6T market; it is ramping a 1.6T platform, developing 3.2T and co-packaged-optics technologies, and has planned about $920 million of capex mainly for silicon-photonics and SiGe capacity.

What the evidence establishes

Upstream enabler

Disclosed: Tower’s 2025 Form 20-F describes its silicon-photonics platforms and AI-driven optical-interconnect demand.

Materials, substrates, equipment or foundry capacity behind rack components. This is not a component supplier role or an established AI-rack revenue stream.

Component roleSilicon-photonics foundry for 800G/1.6T optics
EvidenceDisclosed: Tower’s 2025 Form 20-F describes its silicon-photonics platforms and AI-driven optical-interconnect demand.
How we knowDisclosed The company’s own filing, release, annual report, product page or investor record describes the AI-server or AI-rack role. Where customers are unnamed, the listing says so.
Primary sourceTower Semiconductor — supporting disclosure
Company or official disclosure; vendor claims are attributed to their source.
Checked. This is the research review date, not the source publication or quote time.

Keep in perspective

Tower is a foundry: it makes silicon-photonics wafers for transceiver makers and does not name them. The market-leadership claim is the company’s own.

Diversified business exposure. This describes the breadth or role of the business; it is not an investment rating. An AI-server product, design-in or partnership does not by itself establish material AI-rack revenue, market share, or future returns.

Connections to the assembly

These links explain the technology relationship. The model is illustrative and does not represent an actual manufacturer’s bill of materials.

Lasers & photonics

Electro-absorption modulated or continuous-wave lasers, and silicon-photonics chips, that turn the signal into light inside the transceiver.

Scope of the company links: InP lasers (EML, CW, VCSEL) and silicon-photonics chips inside modules and co-packaged engines. Lumentum and Coherent make EMLs and CW/high-power lasers and hold NVIDIA purchase commitments for lasers (Mar 2, 2026); Mitsubishi Electric estimates it led data-center EML chips in FY25 and plans over 3x EML capacity by FY30; Sumitomo Electric makes EMLs and CW lasers for AI data centers; Broadcom runs in-house InP/GaAs laser fabs and sells a pluggable laser source for its CPO switches. TSMC provides the silicon photonics in NVIDIA’s CPO switches, Tower runs silicon-photonics foundry platforms for 400G–1.6T modules, TFC makes external-laser-source modules, Furukawa sells CW-DFB chips for silicon photonics, Marvell includes silicon photonics in its interconnect portfolio and MACOM sells lasers and photodetectors. AXT supplies InP substrates upstream. AOI makes laser chips only for its own modules and is mapped under transceivers. TrendForce (reported, context only) puts combined EML and CW-DFB capacity near 50.7 million units a month in 2026.

Related research

Companies with overlapping sector exposure. Their products and evidence may differ; this is not a list of equivalent investments.

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