Artificial intelligence is fueling one of the largest infrastructure investment cycles we’ve seen in decades.
Most investors think about GPUs first, then AI software companies, and finally cloud computing giants like Amazon.
However, behind every AI data center is another layer of infrastructure that could become just as important over the coming decade: optical connectivity.
High-speed AI systems can’t scale without massive bandwidth provided by optical interconnects.
Data center AI systems are only growing larger, with hyperscalers deploying more GPUs than ever before. Training large AI models requires hundreds, if not thousands, of GPUs working together at once.
This means more data needs to move between servers, switches, accelerators, and storage systems than ever before.
Traditional copper networking is rapidly reaching its power and physical limits. Optical connectivity is emerging as the backbone infrastructure of the AI economy.
That spells a huge investment opportunity.
In post, I’ll highlight some of the best optical connectivity stocks to buy in 2026, from large-cap infrastructure leaders to pure-play silicon photonics companies to smaller speculative names that could skyrocket if they manage to win contracts in the AI boom.
Why Optical Connectivity Matters More Than Ever
AI isn’t just about computing. It also requires moving tremendous amounts of data at incredibly high speeds.
You can’t train a large language model with thousands of GPUs unless all those GPUs can communicate quickly.
Optical connectivity uses light to move data instead of traditional electrical signals used by copper networking. Compared to legacy copper networking tech, optical solutions provide:
- Higher throughput
- Lower latency
- Lower power consumption
- Better thermal characteristics
- Greater distance
- More room for scaling into the future
Optical connectivity is quickly moving from a niche product into a foundational requirement for AI.
Every major hyperscaler including Microsoft, Amazon, Meta, and Alphabet (Google) are already massively investing into optical networking infrastructure.
Investors who catch this trend early could have investment opportunities beyond the next NVIDIA.
What Makes a Strong Optical Connectivity Investment?
The optical ecosystem is broad and covers many different companies focused on various aspects of the supply chain.
Some companies make optical transceivers, while others build out full photonics systems. There are networking switch companies, laser manufacturers, and pure-play silicon companies building specialty chips for optics clients.
Investors should consider several key factors when looking at optical connectivity stocks:
AI Infrastructure Exposure
Hyperscaler spending on AI infrastructure will likely drive massive growth in the near-term. Companies with direct exposure to AI data centers stand to benefit greatly.
Next-Generation Networking Leadership
800G, 1.6T, silicon photonics, Co-Packaged optics, and optical engines will all be important technologies over the next decade. Leadership matters.
Hyperscaler Relationships
Long-term contracts with large cloud providers can solidify recurring revenue and improve visibility.
Manufacturing Capacity
The pace of AI infrastructure deployment is accelerating so quickly that companies with manufacturing scale could have a competitive advantage.
Profitability
There are plenty of speculative optical companies out there. Other names combine solid growth with profitable businesses and a history of execution.
Best Optical Connectivity Stocks For Investors To Watch
Below we’ve compiled a list of some optical connectivity stocks investors may want to keep an eye on as we approach 2026.
Broadcom (AVGO)
Broadcom is one of the strongest overall infrastructure companies in the AI ecosystem as we head into 2026.
Investors typically focus on Broadcom’s AI accelerators and custom chips, but its optical networking exposure is huge and may become a large part of the business long-term.
Broadcom’s business includes:
- Ethernet switching chips
- AI networking infrastructure
- Optical connectivity solutions
- High-speed interconnects
- Data center networking silicon
Essentially, Broadcom supplies the guts that allow hyperscale AI clusters to function efficiently.
I’ve been partial to Broadcom simply because of its scale. Broadcom already has enormous relationships with every major cloud provider on the planet.
Plus, the company continues to benefit from AI infrastructure spending trends.
Another huge reason to like Broadcom long-term is profitability. Broadcom is cash king, generating billions of dollars of free cash flow each year. The company has a long history of strong execution.
For investors looking for a lower-risk way to gain exposure to optical AI infrastructure, few companies may be better than Broadcom.
Marvell Technology (MRVL)
Marvell is another AI infrastructure name that has quietly turned itself into a critical piece of the AI ecosystem over the past few years.
Marvell has meaningful exposure to optical DSPs, PAM4 technology, electro-optics, cloud networking, custom AI silicon, and data center infrastructure.
Its cloud networking exposure is particularly interesting to me as hyperscalers continue building more dense GPU clusters.
AI demand could benefit Marvell’s optical connectivity business in several ways:
- 800G networking adoption
- 1.6T networking adoption
- Transition to larger AI clusters
- Expansion of hyperscale Ethernet
Marvell has other strengths outside of optical connectivity as well. It has diversified exposure to many aspects of the AI infrastructure buildout, helping to reduce cyclical exposure.
If spending on AI data centers remains robust heading into 2026 and beyond, Marvell will likely continue to be one of the biggest winners.
Coherent (COHR)
Coherent has rapidly become one of the most talked about optical infrastructure stocks during the AI boom.
The company provides several components that go into:
- Optical transceivers
- Lasers
- Silicon photonics
- AI networking equipment
- Telecom optics infrastructure
Coherent has naturally benefited as AI clusters become larger and hyperscalers require higher bandwidth to keep everything connected.
While many investors love Coherent due to its exposure to silicon photonics, one thing I like about the company is its exposure across several areas of the optical stack. The company isn’t tied to just one product or service segment.
Coherent is also benefitting from a massive transition to 800G networking right now, with future opportunities in 1.6T optical networking down the road.
While Coherent can be volatile due to the cyclical nature of optical component demand, the AI infrastructure cycle we’re currently in could be substantially larger than past networking cycles.
For investors willing to embrace some volatility, Coherent is one of the most interesting optical connectivity stocks in the market today.
Arista Networks (ANET)
Arista Networks supplies some of the most widely used high-performance Ethernet switching systems in the world. These systems are used by every major hyperscaler and cloud operator.
Arista sits right in the middle of the AI networking bullseye as AI workloads will inevitably produce huge amounts of network traffic growth for years to come.
Not only does Arista benefit from AI data center deployments, but it also has strong exposure to cloud networking growth, hyperscaler demand, high-speed Ethernet adoption, and scalable networking software.
Many investors and industry insiders believe Ethernet networking is going to be one of the big winners over the course of the AI infrastructure buildout.
If Ethernet-based AI computing architectures continue gaining momentum, Arista’s long-term growth could be substantial.
Plus, Arista has the added bonus of being a highly profitable company with extremely strong margins and a long history of execution. That combination is rare these days.
Tower Semiconductor (TSEM)
Tower Semiconductor may be one of the most underrated optical connectivity stocks for investors to buy in 2026.
It’s important to note that Tower is not a pure-play optical company. Tower acts as a specialty semiconductor foundry with several business segments, one of which is silicon photonics and other advanced connectivity technologies.
Silicon photonics refers to the ability to move data through light that is integrated directly into semiconductor systems. Silicon photonics has the potential to dramatically increase efficiency and bandwidth for AI networking applications.
Tower Semiconductor has exposure to:
- Silicon photonics
- Specialty analog semiconductors
- RF chips
- Advanced semiconductor manufacturing
- Infrastructure connectivity solutions
Tower Semiconductor caught my attention because it’s still relatively underfollowed compared to many higher-profile AI infrastructure stocks.
The bull case for Tower isn’t necessarily “AI will change everything.” Instead, I think it could become a critical manufacturer of silicon needed for next-generation optical systems.
For investors looking for a relatively overlooked pure-play infrastructure name with exposure to silicon photonics growth, keep an eye on TSEM.
Lumentum Holdings (LTUM)
Lumentum is another large player in the photonics and optical networking space.
Historically, the company was heavily exposed to telecom and smartphone demand. But over the past few years, AI infrastructure has emerged as a large growth opportunity for Lumentum.
Lumentum’s offerings include:
- Optical transceivers
- Photonic systems
- Networking lasers
- Cloud connectivity solutions
One growth thesis some investors are betting on is that Lumentum will benefit from AI spending that offsets weak telecom cycles in the future.
Investors should keep in mind that historically, Lumentum has been a more cyclical stock than some of its competitors. If you can handle the volatility, LTUM could be a solid pick in the optical space.
Cisco (CSCO)
Cisco is massively investing into AI networking infrastructure and is another company investors may be overlooking.
Cisco is one of the largest networking infrastructure companies in the world. It already supplies many hyperscalers and cloud providers today, but is expanding exposure to:
- AI networking equipment
- Optical infrastructure
- Silicon photonics
- High-performance Ethernet networking
- Data center switching solutions
Cisco is never going to offer blistering growth like some other AI infrastructure companies out there. But if you’re looking for stability with strong cash flow and lower volatility, Cisco is still worth considering.
Sivers Semiconductors (SIVE)
Sivers Semiconductors is a smaller name in the optical and photonics space.
The company specializes in:
- Photonics
- Millimeter wave technology
- Optical engines
- Wireless connectivity solutions
- Advanced communication equipment
The bull case for Sivers is simple. If we continue to see accelerated AI infrastructure spending worldwide, smaller photonics companies like Sivers could enjoy enormous growth simply because they have much lower revenues to start from.
Potential growth opportunities for Sivers include:
- AI data center network infrastructure
- High-speed optical networking
- Next-generation communications infrastructure
- Emerging photonics tech adoption
However, there are obvious risks with Sivers that investors should be aware of:
- Smaller revenue base
- More volatile
- Execution risks
- Potential funding issues
- Revenue not diversified
Personally, I view Sivers as a speculative growth stock in the optical space.
Risks To Consider With Optical Connectivity Stocks
While I believe the long-term opportunity for optical connectivity is enormous, there are some risks and considerations for investors to keep in mind.
Slowdown In AI Spending
Hyperscalers are building AI data centers at a rapid rate right now which is fueling massive revenue growth for optical companies. But if we ever see an AI slowdown, optics stocks could see their valuations come down harshly.
Cyclical Nature Of The Optical Industry
Optical networking has always been a cyclical industry. Companies can experience brutal revenue downturns if we shift into oversupply mode too quickly.
Fast-Pacing Innovation
This industry moves extremely fast. Companies that don’t continue to innovate will be left in the dust.
High Valuations
Valuation risk is always something to consider with tech stocks. Some AI infrastructure stocks are trading at high multiples already.
My Thoughts On Optical Connectivity
Silicon photonics and optical connectivity may end up being one of the largest investment themes of this decade.
Investors are so focused on GPU companies like NVIDIA that they often miss huge infrastructure plays like optical connectivity that will play a critical role in powering the AI economy.
Over time, networking bottlenecks will be just as big of a problem as computing bottlenecks are today.
You can think about AI data centers as massive digital cities full of computer equipment. GPUs and AI chips are the factories within that city. Optical connectivity acts as the highways that connect everything together.
We can only build so many GPUs before we run into limits of how much we can transmit data on existing hardware.
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