[CPO]CPO: Co-Packged Optics Value Chain

CPO (Co-Packaged Optics) Value Chain: A Listed-Company Map from Upstream to Downstream

As AI data centers and ultra-high-speed network infrastructure continue to scale, Co-Packaged Optics (CPO) is becoming one of the most important next-generation optical networking architectures. But CPO is not simply an “optical module” story. It is better understood as a multi-layered industrial stack that runs from critical materials and substrates to lasers, connectors, packaging, switching silicon, and, ultimately, AI data-center network systems. NVIDIA has publicly identified partners such as TSMC, Browave, Coherent, Corning, Fabrinet, Foxconn, Lumentum, SENKO, SPIL, Sumitomo Electric, and TFC Communication in its silicon photonics/CPO ecosystem, while Broadcom has also highlighted CPO switch commercialization.

At a high level, the value chain can be framed as:

Critical metals, substrates, ceramics, and thermal materials → light sources, optical chips, connectors, and packaging → switches, ASICs, and optical engines → AI data-center network systems

This framework is useful because it shows that CPO depends on far more than optical transceivers alone. The supply chain spans materials engineering, advanced packaging, photonics integration, and network system deployment.

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1) Raw Materials

The first layer of the CPO supply chain is raw materials and substrates. The most important inputs include indium phosphide (InP), gallium arsenide (GaAs), germanium (Ge), high-purity indium, gallium, germanium, and AlN-based thermal materials. In this layer, the most relevant core names are AXT, JX Advanced Metals, and Korea Zinc.

AXT (NASDAQ: AXTI)

AXT supplies InP, GaAs, and Ge wafer substrates. The company positions these materials for optoelectronic devices where conventional silicon is not sufficient, making it one of the clearest upstream listed names tied to external light sources and optical chips in the CPO stack.

JX Advanced Metals (TYO: 5016)

JX Advanced Metals links its InP-based compound semiconductor substrates to demand from generative AI and optical communications. That gives it a very direct upstream role in the light-source and detector portion of the CPO value chain.

Korea Zinc (KRX: 010130)

Korea Zinc has highlighted indium, gallium, and germanium recovery and expansion as part of its future growth strategy. While it is not a direct optical-component supplier, it offers strategic upstream exposure through critical minerals refining relevant to III-V materials and photonics.

Related listed peers

Other raw-material and specialty-material names that are directly or indirectly relevant include:

5N Plus

Umicore

Teck Resources

Boliden

These names are more diversified than the core spine above, but they still provide exposure to high-purity specialty metals or related refining.

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2) Thermal Materials

Because CPO places optical engines close to ASICs, thermal management becomes much more important than in conventional pluggable optics. That makes AlN (aluminum nitride), ceramic submounts, and insulated thermal substrates important upstream building blocks.

Kyocera (TYO: 6971)

Kyocera states that its AlN packages, substrates, and submounts are used for high-heat components such as lasers. That places the company close to the thermal-management infrastructure behind optical-source and optical-chip packaging.

MARUWA (TYO: 5344)

MARUWA supplies AlN substrates and is positioned in high-thermal-conductivity insulated substrates, making it closely adjacent to the thermal stack used in CPO and silicon photonics packaging.

Other adjacent names

NGK Insulators

Coherent

These are not pure-play thermal-material suppliers to CPO, but they sit close enough to ceramic insulation, optical materials, or thermal-control functions to matter in the broader map.

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3) Equipment

CPO is difficult not only because of the optical components themselves, but because optical chips and ASICs must be aligned, bonded, assembled, and tested within the same package. The key themes here are advanced packaging, active alignment, OSAT, and silicon photonics assembly/test.

TSMC (NYSE: TSM)

TSMC introduced COUPE (Compact Universal Photonic Engine) and described a photonic-engine approach that integrates silicon photonics chips and electrical control chips for co-packaging with HPC devices. While not an equipment vendor in the narrow sense, TSMC is central to CPO manufacturing infrastructure.

ASE Technology (NYSE: ASX)

ASE has highlighted its silicon photonics packaging platform and CPO assembly capabilities, making it one of the most direct listed exposures on the OSAT side.

SPIL / Siliconware Precision

SPIL has also referenced CPO solutions, reinforcing its role in the packaging and test segment alongside ASE.

Hon Hai / Foxconn (TWSE: 2317)

Foxconn-related entities connect to CPO through high-speed connectors, packaging, and system manufacturing. FIT/Hong Teng’s collaboration activity is especially relevant from an interconnect and assembly perspective.

Other adjacent equipment names

Anritsu

Santec

Applied Materials

BESI

ASMPT

Kulicke & Soffa

Onto Innovation

These names are not all CPO pure plays, but they are relevant to alignment, measurement, inspection, bonding, and advanced packaging.

Overall, the most compelling listed exposure in the Equipment layer is:

TSMC / ASE / SPIL / Hon Hai / Anritsu / Santec.

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4) Components

The Component layer is where the market is focusing most intensely today. This includes lasers, optical engines, silicon photonics, connectors, fiber arrays, passive optics, and optical assembly.

External laser sources / InP lasers

Lumentum (NASDAQ: LITE)

Lumentum is one of the most important component players in the CPO stack. The company sells UHP laser sources for CPO and ELSFP external laser source modules, and states that these are based on an InP platform. Its positioning has been reinforced by strategic alignment with NVIDIA’s CPO ecosystem.

Coherent (NYSE: COHR)

Coherent has been identified as an NVIDIA ecosystem collaborator and supplies lasers for CPO and silicon photonics applications, making it one of the closest global listed peers to Lumentum.

Other adjacent peers

Applied Optoelectronics

Eoptolink / InnoLight

Accelink

These are relevant to high-speed optics and silicon photonics adjacent to the CPO component stack.

Silicon photonics / optical engines

Marvell (NASDAQ: MRVL)

Marvell has outlined a roadmap to integrate CPO architectures into custom AI accelerators and demonstrated related optical-engine capabilities. It sits between components and end systems.

Ciena (NYSE: CIEN)

Ciena sells optical engines for co-packaged or near-packaged applications and is trying to reduce adoption barriers for CPO.

Broadcom (NASDAQ: AVGO)

Broadcom describes CPO as a highly integrated silicon-photonics architecture and is developing optical engines and a broader CPO platform. It spans both the component and end-product layers.

Fiber attach / connectors / passive optics

One of the hardest real-world bottlenecks in CPO is not just the optical chip, but also fiber attach and connector execution.

Sumitomo Electric (TYO: 5802)

Sumitomo Electric has introduced solutions such as 2D low-profile fiber couplers and 2D fiber arrays for CPO, making it one of the most representative listed names in passive optical connectivity.

Corning (NYSE: GLW)

Corning emphasizes CPO-oriented optical-connectivity architectures and is a major listed player in passive optical infrastructure.

Browave

Browave is directly tied to fiber arrays, micro-optics, and coupling, and has also been referenced in the NVIDIA ecosystem context.

Fabrinet (NYSE: FN)

Fabrinet is best understood as a high-end optical assembly and manufacturing partner rather than a branded end-product vendor.

Hon Hai / FIT

Hon Hai and FIT are relevant from the standpoint of high-speed connectors, assembly, and system integration.

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5) End Products

This layer refers to the actual end products that incorporate CPO, including switches, network systems, and AI server/XPU platforms.

NVIDIA (NASDAQ: NVDA)

NVIDIA introduced Spectrum-X Ethernet Photonics, presenting a switch system that integrates CPO directly with ASICs. Given AI-factory and hyperscale data-center demand, NVIDIA is the most important downstream anchor.

Broadcom (NASDAQ: AVGO)

Broadcom has advanced commercialization with its Bailly 51.2T CPO Ethernet switch system and later-generation CPO platforms.

Cisco (NASDAQ: CSCO)

Cisco has demonstrated CPO-based data-center switching systems. This still appears more like technology validation than scaled revenue today, but it remains important from a systems-vendor perspective.

Micas Networks

Micas Networks is relevant as an OEM/ODM-type exposure associated with the Broadcom ecosystem.

Marvell

Marvell is active not only in switching but also in accelerator-side CPO, giving it exposure that extends into AI compute-adjacent hardware.

Ciena

Strictly speaking, Ciena is closer to the component layer, but because its optical engines can be used directly by system integrators, it can also be viewed as a quasi-end-product exposure.

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Core Names and Their Positions

AXT → Raw Materials

InP / GaAs / Ge substrates.

JX Advanced Metals → Raw Materials

InP substrates / high-purity metals.

Korea Zinc → Raw Materials

Indium / gallium / germanium refining.

Lumentum → Components

CPO external laser sources / InP lasers.

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Practical Peer Buckets

Raw-material pure / near-pure plays

AXT, JX Advanced Metals, Korea Zinc, 5N Plus, Umicore.

Core CPO component names

Lumentum, Coherent, Marvell, Ciena, Broadcom.

Passive connectivity and assembly

Corning, Sumitomo Electric, Browave, Fabrinet, Hon Hai, ASE, SPIL.

Final systems

NVIDIA, Broadcom, Cisco, Marvell, Micas Networks.

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The Most Important Takeaway

The central issue in CPO today is not simply optical-module demand. The real bottlenecks can be summarized in five areas:

1. InP and critical-material supply

2. Lasers and external light sources

3. Fiber attach, connectors, and passive alignment

4. Advanced packaging, OSAT, and thermal management

5. Timing of switch and ASIC adoption

From this perspective, the AXT – JX Advanced Metals – Korea Zinc – Lumentum combination captures the most important upstream-to-midstream spine of the CPO value chain. Adding Coherent, Corning, Sumitomo Electric, Browave, ASE/SPIL, and TSMC on top of that creates a highly practical listed-company framework for real-world CPO analysis.

Closing Thought

CPO is not simply a story about better optical modules. It is a supply-chain architecture that only works when critical materials, III-V substrates, thermal materials, advanced packaging, optical engines, and end-network systems all mature together. That is why it makes more sense to analyze the theme as a full stack—from upstream materials through downstream deployment—rather than focusing only on the final switch vendors.