Principle of Fused Tapered Fiber Coupler
Fused couplers are used to split optical signals between two fibers, or to combine optical signals from two fibers into one fiber. This method provides a simple, rugged, and compact method of splitting and combining. 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. A finite-element model for simulating the influence of thermal fluctuations on fused-tapered. A fused coupler basically consists of two, parallel optical fibers that have been twisted, stretched and fused together so that their cores are very close to each other.
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