Two Common Encapsulation Structures For ROSA

ROSA (Receiving Optical Sub-Assembly) is a core component of optical transceivers, which converts optical signals into electrical signals. According to different application scenarios and cost requirements, ROSA adapters are mainly divided into two mainstream packaging structures: ferrule-free type and ferrule-type, with the core difference being whether a ferrule is configured to adapt to different transmission scenarios. Details are as follows:

Figure 1 Structure of Ferrule-Free ROSA

Figure 2 Structure of Ferrule-Type ROSA

1. Ferrule-Free ROSA

The ferrule-free solution is divided into two sub-types: adapter with stainless steel housing and built-in ceramic sleeve, and plastic adapter. Figure 1 shows the ROSA structure with a plastic adapter. This solution features lower material and manufacturing costs and high cost performance, which is widely used in low-speed and short-distance optical transceivers.

2. Ferrule-Type ROSA

Above the TO-CAN ball lens inside the ferrule-type ROSA, there is an 8° inclined ferrule, which can effectively reduce optical path reflection interference and greatly improve the quality of optical signal transmission. To ensure assembly accuracy and structural stability, this type of adapter generally adopts a composite structure of stainless steel and ceramic materials with higher process precision, and is mostly used in high-speed and long-distance optical transceivers.

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Two Common Encapsulation Structures For ROSA