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A highly temperature sensitive directional coupler is demonstrated experimentally by selectively filling nematic liquid crystal into a single void of the photonic crystal fiber. The temperature response of the device exhibits good linearity.
We demonstrated a fiber sensor for simultaneous measurement of refractive index and temperature by cascading one long period grating and one modal interferometer. Cladding mode interference between them was also investigated here.
We report on the fabrication of a miniaturized photonic crystal fiber (PCF) tip sensor for sensitive liquid refractive index measurement. The PCF tip sensor has a hybrid configuration of Fabry-Perot (FP) and modal interferometer. A short length (less than 1 mm) of PCF is spliced to a standard single mode fiber. An air bubble is created in the splice region forming the FP cavity. The air holes are...
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