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In this paper, a high sensitivity of splicing regions tapered photonic crystal fiber (PCF) Mach–Zehnder interfero- metric refractive index (RI) sensor is described and experimentally demonstrated. Compared with cascaded bi-tapered single-mode fiber (SMF) Mach–Zehnder interferometer (MZI), the splicing regions tapered PCF MZI have higher sensitivity for the reason that it can better control and excite...
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