China's communications-equipment names opened briskly on the morning of November 11, according to a JRJ report, and by 10:00 a.m. four stocks had already hit the daily limit — Huamai Technology, Dingxin Communications, Cambridge Technology and Sunsea AIoT. The tape told a similar story elsewhere. Yute Photoelectric jumped over 17 percent, Eoptolink rose more than 6 percent, and Innolight gained over 5 percent. 21jingji's same-day coverage added that the optical-module leaders staged a strong rebound, with Innolight and Eoptolink touching their largest intraday gains of the year.
Why is money piling in? The industry's driver has changed hands, from a 5G replacement cycle to one powered by AI computing. Global model usage keeps climbing, cloud providers keep raising capital expenditure, and demand for high-speed modules, optical devices and fiber is growing fast as a result. 1.6T optical modules have entered volume shipment, while CPO and silicon photonics are commercializing quickly. The market's working assumption is that orders and earnings at the leading suppliers are heading into a concentrated delivery phase.
China's position in this chain matters too. Domestic optical-module makers hold more than 70 percent of the global market and are deeply tied to leading overseas cloud customers. The upstream story is just as interesting. Domestic output of 25G/50G high-speed optical chips keeps rising, indium-phosphide substrates are in tight supply, and silicon photonics penetration has passed 50 percent. As products iterate from 800G toward 1.6T and 3.2T, value and margins along the chain are climbing together.
Delivery pace varies by segment, though. Module and device makers see the benefit first from overseas spending and enjoy the highest order visibility. Fiber and cable gain from cluster interconnect and backbone upgrades, a tailwind that arrived after hollow-core fiber passed breakthrough validation. Chip and silicon-photonics players capture domestic-substitution premiums, while equipment and switch vendors are pushing into servers and storage, where government and enterprise business offers a fresh growth curve.
A word of caution is in order. The longer the rally runs, the less room valuations leave for error on earnings delivery. Watch three things next — the 1.6T shipment pace, overseas cloud capex guidance for 2027, and margins on new products. Those are the concrete indicators that will decide whether this holds up.