Refractive index and strain sensor made of S-tapered photonic crystal fiber

Abstract

An experimental investigation on an S-tapered photonic crystal fiber interferometer is presented in this paper. The sensor exhibits highly surrounding refractive index sensitive, which is 4.7 × 10 −3 RIU (refractive index unit) in 1.33-1.39 and 1.45 × 10 −3 RIU in 1.39-1.44 commensurable with general sensors. Attribute to the S-shape's distortion, red shifts are measured in axial strain test. In addition, insensitivity (4.3 pm/°C) in low temperature and sensitivity (22.4 pm/°C) in high temperature are confirmed by experiments. These properties combined with a simple fabrication process and a durable structure.

A Novel Strain Sensor with Large Measurement Range Based on All Fiber Mach-Zehnder Interferometer

“…The low-index micro-holes is surrounded by high-index cladding that enable the total internal reflection (TIR) effect in order to guide the light into the cladding modes. In recent years, some coupler or splitter devices [ 23 , 25 ] and novel fiber sensors based on PCFs [ 8 , 21 , 26 , 27 , 28 ] have been attracted wide attention. For instance, in 2007, Villatoro [ 8 ] reported a temperature-insensitive strain sensor based on SMF-PCF-SMF structure.…”