With the spread of data centers and 5G, the construction of optical fiber networks is progressing rapidly in countries all over the world. For this purpose, connection technology for connecting optical fibers is necessary, and various connection technologies have been developed according to applications such as connector connection, fusion connection, and mechanical splice. Especially in the case of outdoor connection, a connection technology called FA (Field Assembly) connector (Fig. 1) has been developed because simple connection in the field and high reliability are required. The FA connector consists of a ferrule with internal fiber bonded, fixed and polished at the factory. It is connected by a mechanical splice (FIG. 2) to an optical fiber that has been processed in the field. The mechanical splice comprises a V-groove substrate, an upper lid, and a U-shaped spring, and when the optical fibers are connected, a wedge is inserted from the side of the mechanical splice, and the opposed optical fibers are connected by pushing each other. Then, the wedge is pulled out to be mechanically fixed by a U-shaped spring. A refractive index matching gel is used between the end faces of the connected optical fibers to avoid Fresnel reflection. There is no adhesive and polishing process to assemble a mechanical splice in the field, and it is also unnecessary a power supply for the assembly. For the reliability of the optical fiber network, how the optical fiber is stored and maintained after it is connected is very important, and it is necessary to ensure the long-term reliability in various environments in the field such as rain, wind, and ultraviolet rays. FIG. 3 is a connector connection housing case, which is constructed of a plastic housing and a rubber packing, and has an economical structure that ensures long-term reliability.
Figure 1. FA Connector Structure
|1) internal structure||2) wedge insertion|
Figure 2. Mechanical Splice
Figure 3. Drop Connecting Case