According to the principle, fiber optic splitters can be divided into Fused Biconical Taper (FBT) splitter and Planar Lightwave Circuit (PLC) splitters. FBT splitters are widely accepted and used in passive networks, especially for instances where the split configuration is smaller (1×2, 1×4, 2×2, etc. The optical network system uses an optical signal coupled to the branch distribution. Fiber Bragg Grating (FBG) utilizes the diffraction principle to modulate the refractive index (RI) of the optical fiber periodically, forming a diffraction grating with high sensitivity and frequency selectivity, suitable for precise measurements of parameters for instance temperature and stress. Fused couplers are used to split optical signals between two (or more) fibers or to combine optical signals from two (or more) fibers into one fiber. It is not only low in cost, but also supports different energy-wind-solar ratios. They play a crucial role in various applications, such as telecommunications, data centers, and fiber-to-the-home (FTTH) installations.
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