Introduction to hermetic and non-hermetic packaging of Optical Modules

1. Introduction to hermetic sealing and non-hermetic sealing of optical modules
      Optical module hermetically sealed package and non-hermetically sealed package is mainly reflected in the application of the differences in the packaging of the optical chip, that is, the light-emitting semiconductor chip and photodetector is installed in a sealed cavity to distinguish;
2. Hermetic Packaging
      Optical module hermetic sealing generally refers to the VCSEL / FP / DFB / PD / APD and other optical chips encapsulated in a sealed cavity, and in the cavity filled with some inert gas for protection, physically isolated from water, oxygen and other corrosive gases or liquids on the production of optical chips to improve the adaptability of the product to the environment and reliability; more suitable for use in the easy to water vapor corrosion as well as the temperature impact of a large place. It is more suitable to be used in places where water vapor corrosion and temperature influence is large;
      Optical modules in the common optical chip hermetic sealing TO-CAN and BOX package, the following figure for the TO-CAN package structure of the schematic diagram;

Figure 1 TO-CAN package BOSA optical components

3. Non-Hermetic Packaging
      Non-hazardous encapsulation refers to the optical chip is not hermetically sealed treatment of an optical module production process, usually has a better production cost advantage, common COB and COC process, the use of optical chips will be directly in contact with air production, only rely on the chip itself on the durability of the oxidation of water and other gases, more susceptible to the impact of the external environment, more used in constant temperature and humidity of the data center room interior;

Figure 2 Non-airtight COB package QSFP products

      Selection of optical module package for hermetic or non-hermetic, mainly depends on the assessment of the use of the environment and cost budget, from the reliability and environmental adaptability of the general preference for hermetic package optical module products, from the cost and applied to the internal computer room can also choose non-hermetic optical module.
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