Summary of Key Points
Optical modules are the core components in AI data centers that are responsible for “data delivery” by converting electrical signals into optical signals, enabling fast data transfer between servers and GPUs. Chinese manufacturers dominate the global high-speed optical module market (seven out of the top ten), but they still rely on overseas suppliers for some critical upstream components such as DSP chips and advanced lasers. The surge in AI demand has led to a shortage of optical modules, prompting customers to secure supplies for the next 1-2 years in advance. The future competition will not focus solely on optical modules themselves but will extend to the entire optical interconnection network and computing infrastructure, with supply chain pressures impacting both upstream materials and downstream equipment.
Detailed Analysis
1. Optical Modules: The Lifeline of AI Data Centers
Optical modules act as “high-speed highway converters” for data. AI training requires massive amounts of data to be transferred between servers and GPUs. Electrical signals are limited in speed and efficiency, so optical modules convert them into optical signals, increasing transfer speeds by several times while reducing losses. With the explosive growth in generative AI (such as ChatGPT) and large-scale model training, the demand for optical modules has skyrocketed, making them an essential component of AI infrastructure.
- Example: Training a large model with billions of parameters requires thousands of GPUs working together, each connected by high-speed optical modules. Without these, data transfer would be extremely slow, significantly prolonging training times.
- Market Forecast: Institutions predict that the global optical module market will reach nearly $60 billion by 2031, with a growth rate of around 60%, highlighting the strong demand.
2. Chinese Manufacturers Lead the Global Market
Chinese companies dominate the global optical module supply chain, with seven out of the top ten suppliers. They are particularly strong in high-end models (400G/800G/1.6T). This is due to their advantages in mass production and timely delivery.
- Reasons for Success: Chinese manufacturers can produce large quantities quickly and meet strict deadlines, which is challenging for overseas competitors.
- Impact on the Supply Chain: Even if U.S. companies try to expand their capacity, they may not be able to replace China’s supply chain in the short term.
3. Weaknesses in the Supply Chain
Despite China’s strength in module manufacturing, it relies on overseas suppliers for critical components:
- Core Chips: DSP chips (the “brains” of optical modules) are mainly provided by American companies like Marvell and Broadcom.
- Advanced Lasers: High-end EML lasers are supplied by Coherent and Lumentum.
- Materials: Phosphide Indium (InP), a key material for high-end modules, has a significant shortage. The global demand in 2026 is expected to be 2.6-3 million units, but only 750,000 units can be produced, leading to price increases.
These weaknesses affect the supply chain and increase costs, which can impact downstream equipment production, especially since high-end devices have long certification cycles.
4. Evolving Competition
The competition is no longer just about the speed of optical modules but the entire optical network ecosystem:
- Future Trends: Technologies like Co-Packaged Optics (CPO) are emerging, combining optical modules with switch chips to reduce transmission distances and power consumption.
- Interconnection Networks: Operators (mobile, telecom) are investing in high-end 400G/800G OTN equipment for cross-regional data transfers.
5. Supply-Demand Tightness and Stockpiling
The current shortage of optical modules has led to customers stockpiling supplies. This highlights the importance of supply chain resilience:
- Customer Behavior: Instead of purchasing on a project basis, companies are booking orders for the next 1-2 years to avoid price increases or shortages.
- Impact on Companies: Manufacturers need to ensure access to critical components and materials and deliver on time. For customers, planning ahead and securing supplies is crucial for AI infrastructure development.
In summary, optical modules are essential for AI operations, and Chinese companies have a strong position in this industry. However, they must address supply chain vulnerabilities and expand their offerings to the entire optical network ecosystem. For customers, stockpiling and a resilient supply chain are critical for success in the AI era.