An optical modules typically integrates an optical transmitting device (TOSA, with a laser), an optical receiving device (ROSA, with a photodetector), functional circuits, a main control circuit board (PCBA), a housing, and optical (electrical) interfaces . An optical modules typically integrates an optical transmitting device (TOSA, with a laser), an optical receiving device (ROSA, with a photodetector), functional circuits, a main control circuit board (PCBA), a housing, and optical (electrical) interfaces . As artificial intelligence, 5G infrastructure, and hyperscale data centers demand ever-faster data transmission, optical modules have become the bedrock of modern communication. The Printed Circuit Board (PCB) at the heart of these modules is no longer a simple substrate but a highly engineered. 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. Its primary function is to achieve optoelectronic conversion by converting electrical signals into optical signals and vice versa. As illustrated in the Optical Module.