The Development Path of Optical Modules reflects the industry's constant pursuit of higher speed, improved density, and smarter integration. As a result, optical modules have evolved from 1G to 800G, supporting cloud computing, AI workloads, and next-generation internet. At the core of this infrastructure lie optical modules—ingenious devices that convert electrical signals into optical signals, enabling lightning-fast data communication over fiber optic cables. Its main function is to convert an electrical signal into an optical signal at the transmitting end, transmit it through an optical fiber, and then convert the optical signal back into an electrical. The optical module serves as a crucial component in optical fiber communication systems, operating at the physical layer, which is the lowest layer in the OSI model. The goal is to provide a comprehensive understanding of the technological evolution and application.