1. China has become a global powerhouse in optical modules, a crucial component for connecting chips and data centers in AI clusters. [para. 1] Seven of the world’s 10 largest optical-module companies are Chinese, and the top two suppliers, Zhongji Innolight and Eoptolink, together control over 60% of the market for the fastest 800G-and-higher modules. [para. 4]
2. Demand for these modules has surged alongside AI development. Global shipments of 400G and higher transceivers exceeded 20 million units in 2024, more than triple the year prior, according to TrendForce. [para. 3] By the end of 2026, 800G-and-faster products are expected to account for over 60% of shipments, with annual totals exceeding 63 million units. [para. 3]
3. Investor enthusiasm has been massive. Zhongji Innolight’s shares surged nearly tenfold in a year, pushing its market value above 1 trillion yuan. [para. 6] The leading firms are raising capital in Hong Kong; Zhongji Innolight raised HK$53.4 billion in a major 2026 IPO, while Eoptolink disclosed plans for its own offering. [para. 7]
4. However, the AI boom is a double-edged sword, exposing deep vulnerabilities. The industry relies heavily on U.S. customers, who spent far more aggressively on AI infrastructure than Chinese firms. [para. 8][para. 14] In 2025, overseas customers accounted for over 90% of sales for the top two firms. [para. 15] Geopolitical risk is severe; a Reuters report on potential U.S. import restrictions triggered a sharp 13% selloff in Zhongji Innolight. [para. 17] Analysts warn non-Chinese makers could fill only 20% to 30% of demand if access is cut off. [para. 18][para. 19] To mitigate this, companies are moving production to bases in Thailand. [para. 20]
5. Supply-chain vulnerabilities run in both directions. While China leads in assembly, it relies on U.S. and Japanese suppliers for high-value upstream components like DSPs and high-end EML chips. [para. 21][para. 22][para. 24] Domestically, China has made progress in passive components, and firms like Yuanjie are closing the gap in optical chips, aided by investments from Zhongji Innolight. [para. 25][para. 26][para. 27]
6. Beijing is pushing for localization, targeting 45% domestic supply of high-end 200G EML chips by 2028. [para. 28][para. 29] The greater challenge is advanced DSP chips, where Chinese firms lag far behind. [para. 30] Alternative technologies like co-packaged optics (CPO) also pose a long-term risk to the current pluggable module market, prompting Chinese vendors to hedge their technology bets. [para. 31][para. 32]
7. Despite the risks, business remains exceptionally strong. Zhongji Innolight’s order book covers all of 2026, and its first-quarter revenue nearly tripled year-on-year to 19.5 billion yuan. [para. 33] The fundamental concern for investors is whether the immense capital spending by AI firms can be sustained without adequate returns, creating significant market uncertainty. [para. 34][para. 35]
AI generated, for reference only
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