This article explores the core SMT assembly technologies for data-center optical-module PCBs in the CPO era, highlighting key challenges and practical solutions in electro-optical co-design, thermal-power management, and precision manufacturing. 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 Printed Circuit Board (PCB) at the heart of these modules is no longer a simple substrate but a highly engineered system. 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. Data rates range from 155 Mbps to 6 Gbps and even up to 10 Gbps.
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