The global race to build the next generation of artificial intelligence (AI) data centers is dramatically reshaping the world’s optical communications industry, with China’s decades-long investment and recent technological leaps propelling it to the center of this high-stakes transformation. As AI workloads soar and the demand for lightning-fast, high-capacity data transmission explodes, optical modules, cables, and related components have become the backbone of the digital era—sparking fierce competition, rapid innovation, and eye-popping financial results across the globe.
China’s story is nothing short of remarkable. According to South China Morning Post and market research firm TrendForce, Chinese companies are expected to command a staggering 56% of the world’s optical module contract manufacturing capacity in 2026, with firms like InnoLight and Eoptolink alone supplying 46% of North America’s needs. This dominance is no accident. It stems from more than 20 years of massive, government-driven investments in national broadband infrastructure, beginning in the late 1990s when China’s vast geography and low landline penetration demanded both backbone and regional fiber networks.
By the end of 2025, China’s national optical cable length had reached 74.99 million kilometers, with 1.251 billion fixed broadband ports and 1.21 billion fiber-to-the-home or office ports—an astounding 96.8% of all ports. In just that year, China added another 2.113 million kilometers of optical cable. The government’s relentless focus on scale and cost competitiveness has paid off handsomely, enabling Chinese manufacturers to achieve high production yields and undercut global rivals on price and delivery times.
These efforts have also fueled a surge in overseas expansion. Yangtze Optical Fibre and Cable (YOFC), for example, now operates eight production facilities across six countries, including Indonesia, South Africa, Brazil, Poland, Germany, and Mexico. In 2025, YOFC’s overseas sales jumped 47.8% to roughly 12.8 trillion Korean won, making up 42.7% of the company’s total sales. As reported by Economic Daily, this global presence has helped Chinese products become fixtures in data centers and enterprise networks worldwide.
Meanwhile, the AI revolution is pushing the limits of what these networks can handle. Modern AI data centers rely on optical links to connect tens of thousands of graphics processing units (GPUs), and any failure in these links can cripple cluster throughput and network availability. The stakes are high: Microsoft’s long-term studies have shown that signal degradation in optical links often precedes system failures, highlighting the critical importance of reliability and quality in the entire optical chain—from cables and connectors to modules and lasers.
Industry leaders aren’t standing still. In March 2026, a consortium including AMD, Broadcom, Meta, Microsoft, Nvidia, and OpenAI launched the Optical Compute Interconnect Multi-Source Agreement (OCI MSA) to standardize high-speed optical interconnects within GPU racks. These standards aim to push data rates from 200 Gbps per direction today to over 3.2 Tbps per fiber in future generations, supporting both pluggable modules and co-packaged optics that could replace traditional copper wiring even within server racks.
As China cements its manufacturing dominance, Western companies and investors are racing to keep pace. The past month has seen a dramatic surge in optical component stocks, with shares of Applied Optoelectronics, Lumentum, Coherent, Fabrinet, and Corning all soaring more than 25% since late July 2026, according to Bloomberg and Newspim. Applied Optoelectronics alone jumped over 80% in 10 trading days, while Coherent climbed 61%. The trigger? Robust earnings from Lumentum and others, coupled with the unrelenting capital spending of tech giants like Microsoft, Alphabet, Amazon, and Meta.
“Optical stocks are at the bottleneck of the AI industry, gaining pricing power and momentum as capital expenditures accelerate,” said Michael Monahan, portfolio manager at FounderETF, in comments to Bloomberg. “As long as this investment surge continues, these stocks should keep climbing.”
Indeed, the numbers are eye-popping. Applied Optoelectronics’ revenues are projected to grow 130% in 2026 and 174% in 2027, while Lumentum’s Q4 2025 earnings and Q1 2026 outlook both beat Wall Street expectations, sending its shares up 16% on August 12. The U.S. Federal Communications Commission is reportedly considering restrictions on imports of certain Chinese optical transceivers, which could further boost American manufacturers’ fortunes.
The boom isn’t limited to China or the U.S. In South Korea, companies like Opticis have pioneered optical conversion products for digital video transmission since 1999, amassing 24 overseas and 79 domestic patents. Opticis’ All-in-One AV Over IP System has been designated a procurement excellent product by the Korean Public Procurement Service for three years running and is widely used in control rooms, airports, and power plants. The company is now expanding into high-reliability markets such as medical, defense, factory automation, and aviation, aiming to supply advanced 4K and higher-resolution optical link solutions.
Other Korean firms are also riding the wave. Seoul Viosys, with its competitive VCSEL and micro-LED optical semiconductor technologies, rose over 10% on August 12 as it accelerated its push into AI data center optical communications. LS, supported by its optical cable subsidiary, saw a 6.67% stock jump on improved performance and global infrastructure orders, while Mercury, RFHIC, and FiberPro posted gains on expectations of supplying AI data center optical modules. Still, some stocks faced declines due to short-term profit taking, underscoring the sector’s volatility.
The feverish pace of investment and innovation is mirrored in the U.S. market, where AI infrastructure-related companies like Nevious and CoreWeave posted blockbuster earnings. Nevious’ AI cloud revenue soared over 500% year-over-year, with four contracts exceeding $1 billion each and customer prepayments projected to top $9 billion in 2026. CoreWeave’s Q2 revenue jumped 112%, and its backlog reached $104 billion, with another $25 billion in new contracts secured since the quarter’s end. Super Micro Computer, another key player, reported a record backlog and over $60 billion in new orders, driven by relentless AI infrastructure demand.
Optical component makers are reaping the rewards. Lumentum’s strong earnings and bullish outlook sparked a 13% stock rally, while Coherent delivered record sales and exceeded both revenue and earnings per share forecasts. Both companies are key partners in Nvidia’s multi-billion-dollar investments in silicon photonics, a technology expected to revolutionize data center connectivity by integrating optical and electronic components on a single chip. As Lumentum’s CEO noted, “The transition to optical connectivity in AI data centers is accelerating, and our scale and technology leadership position us for continued growth.”
Yet, as the sector races ahead, risks abound. High valuations mean that any slowdown in AI capital spending or unexpected supply chain disruptions could trigger sharp corrections. As Ted Mortenson, a technology strategist at Robert W. Baird, cautioned, “Until the full demand materializes, we should expect continued volatility. But looking at 2027 and beyond, the fundamentals are compelling.”
With AI’s insatiable hunger for data pushing optical communications to new heights, the world’s leading manufacturers, investors, and innovators are locked in a high-speed contest—one that’s reshaping the very infrastructure of the digital age.