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. Designing and producing these complex PCBs presents formidable challenges, requiring a convergence of disciplines—from high-frequency signal integrity and advanced thermal management to micron-level mechanical precision. Optical module PCB design demands exceptional accuracy to ensure stable and. 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. On the. In the evolution of optical modules, PCBs predominantly adopt HDI structures—whether mechanical blind-via HDI, laser blind-via HDI, or rigid-flex + HDI. 1 mm in thickness, with most designs comprising ≤12 layers. Two. As transmission speeds move from 56G PAM4 to 112G PAM4 and beyond, PCB technology has become one of the most critical factors determining optical module performance, reliability, and thermal stability. For manufacturers and network equipment providers, choosing the right high-speed PCB solution is.