Coating: Select the coating method by requirements and volume—automated spray, dip, or selective coating—and tightly control thickness. Inspection & rework:. Conformal Coating in CPO Environments: Why Is It a Critical Protective Layer? CPO modules tightly integrate fiber arrays, lasers, modulators, and ASICs on the same IC substrate, with interconnection and power density far exceeding traditional PCBs. This open or semi-open structure makes them highly. Unlike conventional PCBs, those designed for optical modules operate at the intersection of extreme electrical performance, stringent thermal constraints, and microscopic mechanical tolerances. They improve transmission, reduce reflections, protect substrates, filter specific wavelengths, and in many cases make high-performance optical systems physically possible. They are available in varying viscosities and adhere well to a wide. In a common POM class Quad Small Form-factor Pluggable (QSFP), for example, power dissipation requirements have increased from a typical 4-5W in a QSFP-28 (100 GbE) to 15-20W for the latest-generation 400 GbE QSFP- Double Density (QSFP-DD) modules, and more than 20W for 400ZR Data Center.
