Overview of Fused Biconical Tapered (FBT)

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We can easily identify potential intrinsic problems that can occur by understanding the types of optical splitters and the way they are manufactured. By heating 2 optical fibres the fabrication of the FBT splitter is performed and they are heated until they coalesce into a composite wave guiding structure. During heating, the fibres are slowly stretched and tapered. Light is launched into the input fibers during this process whereas a process control computer monitors the outputs and it adjusts fusion temperature and duration and pulls tension. By doing this you can achieve the desired coupling ratio between fibers is achieved. In small split counts, FBT splitters are normally used. In a protective enclosure, the completed coupler is sealed, which consists of a metal tube that is placed around the fused section of bare fibers, and with the help of an adhesive, it is held in place. Through the ends of the package, there is an extension of 250- or 900-micron-coated fiber pigtails.

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