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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.
In this paper, we report and demonstrate a novel miniaturized intrinsic Fabry–Perot interferometer (IFPI) based on a simplified hollow core fiber ended with a hollow silica sphere tip. The hollow core fiber is spliced to single mode fiber and subsequently applied with fusion arc at the end, forming a hollow sphere with a thin silica wall. The reflection spectrum is modulated by the environment of...
Photonic crystal fibers (PCFs) offer innovative design and optical properties. In this paper, we measured the temperature dependence of a polarization-maintaining PCF based interferometer. The sensor head was fabricated by splicing PMPCF to single mode fiber (SMF) and temperature sensitivity of 15.4 pm/°C was obtained. The temperature measurements were carried out up to 1000°C.
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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