The industrial IoT sector is expected to account for 12% of global optical module revenue by 2030, with sensors and actuators requiring high-bandwidth connectivity. An optical module is a typically hot-pluggable optical transceiver used in high-bandwidth data communications. Optical module chips are semiconductor devices that enable high-speed data transmission in fiber optic networks. Understanding the composition of these vendors is critical to grasping the structure of the optical. Data centers will keep dominating optical module demand as AI and cloud drive revenue growth through 2030. Optical module demand is being pulled in two directions at once, faster bandwidth for dense networks and tighter constraints on power, security, and lead times. As of April 22, A-shares have seen eight 10-bagger stocks in the past year, five of which belong to the optical module sector: Hengdong Optics, Yunjie Technology, Tengjing Technology, Zhongji. From an industry chain perspective, optical modules belong to the “chip → packaging → system application” extension layer, acting as a critical bridge between computing hardware and fiber-optic communication infrastructure. In markets, it does not work that way. The right way to frame this chain is around three questions: What is the actual.