As a core component in optical communications, the stability and reliability of optical modules are paramount. The optical modules pcb design not only determines their electrical performance but also plays a decisive role in thermal management, signal protection, and. Unlike conventional PCBs, those designed for optical modules operate at the intersection of extreme electrical performance, stringent thermal constraints, and microscopic mechanical tolerances. In simple terms, they convert electrical signals from devices like routers, switches, and servers into light signals that travel through fiber optic cables. On the. Optical PCBs [^1] integrate light-based data transmission with electrical circuits using polymer waveguides and photonic chips, enabling 400Gbps+ speeds for 5G networks and AI servers while reducing power consumption by 40% compared to conventional boards. In today's landscape of high-speed data transfer, the application of optical module PCB technology has. Definition: An Optical Module PCB is the internal circuit board of a transceiver (like SFP, QSFP, or OSFP) responsible for converting electrical signals to optical signals and vice versa.