Abstract
A selectively ethanol-filled twin-core photonic crystal fiber (TC-PCF) sensing scheme is proposed and theoretically investigated for highly sensitive temperature sensing. Different filling cases and fiber structure were simulated to investigate the mode coupling of two solid fiber cores of the TC-PCF. Our calculation for the sensing performance shows that with properly designed fiber structure and filling configuration, a high temperature sensitivity of −16.7 nm/°C could be achieved in a range from 20 to 50 °C.
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