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How to solve the heat dissipation of 400G high-speed optical modules
Optical module manufacturers now list 400G optical modules as key research and development objects. While providing powerful functions, optical modules have their own power consumption and related heat generation increased sharply. Coupled with the compactness of the space, the requirement of multiple plug-in and unplugging, and the controllable temperature management, it brings challenges to the heat dissipation of the optical module.
In order to ensure the heat dissipation of the optical module, in addition to the overall design process, the selection of thermally conductive materials is also an extremely important factor. As we all know, the core component of the optical module is the optical chip, and the current optical module is in a stage of rapid development. As the transmission rate becomes higher and higher, it is necessary to ensure that the optical module maintains stable performance under a certain transmission distance and many harsh working conditions. , The optical chip needs to work within a certain temperature range. Need to use soft and compressible high thermal conductivity materials to quickly conduct heat to the shell.
Another part with a large amount of heat, optical devices (TOSA and ROSA) according to different packaging methods also need to use low oil and low thermal resistance thermally conductive silicone sheet and thermally conductive gel to avoid silicone oil overflow under long-term working conditions and cause the performance of the optical module to decline. In addition, in order to quickly conduct heat from the optical module housing to the cage, a thermally conductive composite material (phase change material plus PI film composite) can be selected at the plug-in position.
Moreover, most of the 400g optical modules use electro-absorption modulated lasers (eml lasers). This type of laser is extremely sensitive to temperature and can only exert its effective performance within the specified operating temperature range. Therefore, this type of laser usually requires heating power. Cooler to control its temperature.
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