The design of the PCB mainboard for photonic modules must meet special requirements such as high-speed transmission, heat dissipation, PCBA assembly, and hot-plugging, setting it apart from ordinary PCBs. Current mainstream optical modules feature either short/long gold fingers or tiered gold fingers. Printed plug fabrication involves five pattern transfers: outer layer circuitry once, solder resist exposure once, printed plug plating once, lead etching once, and selective gold plating or. The optical module offers an effective high-speed solution for a growing telecom market. Data rates range from 155 Mbps to 6 Gbps and even up to 10 Gbps. Designing and producing these complex PCBs presents formidable challenges, requiring a convergence of disciplines—from high-frequency signal integrity and advanced thermal. 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. In simple terms, they convert electrical signals from devices like routers, switches, and servers into light signals that travel through fiber optic cables. These components work together to efficiently convert and precisely transmit optical and electrical signals.