Abstract
A highly sensitive strain sensor based on a photonic crystal fiber (PCF) Mach–Zehnder interferometer (MZI) was proposed. The MZI was formed by splicing two sections of no-core fibers (NCFs) with a piece of PCF between two single-mode fibers. The sensor has exhibited high fringe visibility of up to 22 dB in air and high strain sensitivity of 2.09 pm μ ε −1 in the range of 0 ∼ 2973 μ ε. The strain characteristics of the sensor with different lengths of PCF were also investigated. Moreover, a wavelength hysteresis of less than 0.2 nm and temperature sensitivity of 11.28 pm °C−1 were measured. Additionally, the sensor has the advantages of easy fabrication, larger strain measurement, high extinction ratio, and high resolution, which shows great potential in the field of strain measurement.
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