Two AI Semiconductor Stocks Poised for Millionaire Returns

FinanceThese AI Stocks Will Make Millionaires By 2029

TL;DR

Coherent and Lumenum are positioned to dominate the optical networking market for AI data centers, expected to grow from $23 billion to $112 billion by 2031, with Coherent's 6-inch wafer technology and Lumenum's laser components solving the industry's critical bandwidth bottleneck.

Key Takeaways

1Coherent's 6-inch indium phosphide wafers produce four times more chips at half the cost compared to the 2-4 inch wafers previously used, with plans to quadruple capacity by end of 2027.
2The optical transceiver market is projected to grow at 30% CAGR from $23 billion in 2024 to $112 billion by 2031, twice faster than the S&P 500's historical 10-year growth rate.
3A single GPU requires 48 indium phosphide laser chips for network connectivity across racks, with one 1.6TB transceiver containing eight laser chips, driving massive demand for these components.
4Lumenum's electroabsorption modulated lasers (EMLs) grew revenue 109% year-over-year with 50.4% gross margins while spending only $0.60 per dollar generated, versus Coherent's $14 per dollar spent on capital expansion.
5Nvidia invested $2 billion in both Coherent and Lumenum with multi-year purchase commitments, signaling confidence in their technology as co-packaged optics reduce network power consumption by 60-70%.
6Indium phosphide laser chips face a critical supply shortage with only three global manufacturers (Sumitomo, JX, and AXT), and the material is on China's export controls list, creating supply chain risks.
7Coherent's data center and communications segment generated $5.3 billion of their $7.1 billion annual revenue, indicating 70%+ revenue concentration in AI infrastructure spending.

Notable Quotes

“If you invested $10,000 into Nvidia just four years ago, you'd have over $125,000 today. If you put that money into Palantir, you'd have close to $4 million right now.”
— Alex

“Each new generation like Nvidia's Hopper, Blackwell, and Ruben GPUs got so much more powerful that they would actually turn through the data faster than anything could feed them. That means the bottleneck moved from the chips themselves to the network feeding them.”
— Alex

“A 400G optical connection is 400 times faster than that. And 1.6T means 1.6 terabits per second or 1,600G. That's the kind of insane bandwidth that massive AI data centers need.”
— Alex

“Coherent spent $1.1 billion on capex over the last year versus about $80 million in cash from operations. That means they spent roughly $14 on chip production for every $1 they actually made.”
— Alex

Chapters

1. The AI Data Center Bottleneck Shift

GPU compute capacity has become so powerful that the real bottleneck moved from chips to the network feeding them. Optical networks transmit data at 400G to 1.6T (1,600 gigabits per second) compared to home internet speeds of 500 Mbps to 1 Gbps, making optical connections essential for large distributed AI data centers.

2. Indium Phosphide Lasers and Supply Crisis

Silicon excels at compute but is terrible for making light, so laser chips are made with indium phosphide (INP) instead. The global supply chain was designed for low-volume telecom equipment but now faces a critical shortage as AI data centers demand hundreds of millions of these laser chips immediately.

3. Optical Transceiver Market Growth

The optical transceiver market is expected to grow from $23 billion in 2024 to $112 billion by 2031, representing a 30% compound annual growth rate. A single GPU requires 48 INP laser chips for network connectivity, with each 1.6TB transceiver containing eight laser chips.

4. Coherent: Vertical Integration and 6-Inch Wafer Technology

Coherent moved production to 6-inch indium phosphide wafers, producing four times more chips at half the cost compared to 2-4 inch wafers. They plan to double output by end of 2024 and double again by end of 2027, with Nvidia investing $2 billion and owning nearly 4% of the company.

5. Coherent Financial Performance

Coherent reported $2 billion in quarterly revenue (up 34% YoY) with 38.5% gross margins and $5.61 adjusted EPS (59% growth YoY). Data center and communications segment generated $5.3 billion of $7.1 billion in annual revenues, though the company spent $1.1 billion on capex against $80 million in operating cash flow.

6. Lumenum: Electroabsorption Modulated Lasers

Lumenum's primary product is the electroabsorption modulated laser (EML), which combines a laser with an absorber that blocks light 100+ billion times per second to encode data. The company reported $1 billion quarterly revenue (up 109% YoY) with 50.4% adjusted gross margins and 267% earnings growth.

7. Co-Packaged Optics and Power Efficiency

Moving optical engines next to chips using co-packaged optics reduces energy consumption by over 60% compared to copper connections. Nvidia's co-packaged optical switches cut network power by 3.5 times and save approximately 13 kW per rack, representing 10% of the rack's total power budget.

8. Capital Efficiency Comparison

Coherent spent $14 in capex for every $1 of operating cash generated, betting on an 18-month payback period for data center chip production investments. Lumenum spent only $0.60 per dollar generated, achieving 109% revenue growth with more efficient capital deployment.

9. Critical Risk Factors

Both companies face risks including supply concentration (three global INP suppliers), heavy dependence on hyperscaler spending (70%+ of Coherent's revenue), and Nvidia ownership of both companies. Any slowdown in AI infrastructure spending or supply chain delays could rapidly reverse gains.

10. Investment Recommendation

The presenter favors Coherent for its 6-inch wafer production scale and Nvidia backing, but rates both stocks as worth monitoring. Coherent benefits from supply shortage economics and capacity doubling plans, while Lumenum offers higher capital efficiency with 109% revenue growth at 50% margins.

Key People & Entities

Alex: Host and analyst; 8-year career as electrical engineer and AI researcher at MIT; provides investment thesis on AI semiconductor stocks.
Nvidia: Major GPU manufacturer and investor; invested $2 billion each in both Coherent and Lumenum; owns ~4% of Coherent and signed multi-year purchase agreements.
Coherent: Semiconductor manufacturer; produces indium phosphide lasers and optical transceivers using 6-inch wafer technology; $2 billion quarterly revenue with 59% earnings growth.
Lumenum: Optical networking company; manufactures electroabsorption modulated lasers (EMLs); reported 109% revenue growth YoY and 267% earnings growth; valued at ~$1 billion quarterly revenue.
Sumitomo, JX, AXT: Three primary global manufacturers of indium phosphide supply; supply concentration creates bottleneck risk; AXT manufactures in Beijing, subject to China's export controls.

Glossary

Indium Phosphide (INP): A semiconductor material superior to silicon for creating laser chips; used for optical networking components but with limited global supply concentrated among three manufacturers.
Electroabsorption Modulated Laser (EML): A laser component that combines a continuous-wave laser with an absorber that blocks light up to 100+ billion times per second to encode data onto optical signals.
Co-Packaged Optics: Optical networking technology that places laser components directly next to semiconductor chips, reducing signal loss and power consumption by moving optical engines from the switch front panel into the package.
Transceiver: A module that transmits and receives data; converts electrical signals to light at one end using a laser and converts light back to electricity at the other end.
1.6 Terabits per Second (1.6T): The maximum bandwidth capacity of advanced optical transceivers used in AI data centers, equal to 1,600 gigabits per second, approximately 1,600 times faster than residential internet.
Wafer Size (6-inch vs 2-4 inch): The diameter of the silicon or indium phosphide disk used for semiconductor manufacturing; larger wafers allow production of more chips per wafer and typically achieve better yields.
Compound Annual Growth Rate (CAGR): The annual rate of growth of an investment or market over multiple years, accounting for compounding; the optical transceiver market is projected to grow at 30% CAGR through 2031.
Hyperscaler: Large technology companies like Google, Meta, Amazon, and Microsoft that operate massive data centers and represent the primary customers for optical networking equipment.
Infiniband and Ethernet: Two networking protocols used in data centers to connect GPUs and other compute resources; Infiniband is typically used for short-distance high-speed connections within clusters.

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