Abstract
Abstract In this paper, we theoretically and numerically investigate toluene-filled polarization maintaining photonic crystal fibers (PMPCFs) for temperature sensing application via Sagnac interferometer. We designed a PMPCF with a birefringence of 8.68 × 10−5, a relative birefringence sensitivity of 26% for 5 °C variation and sensitivity of −11 nm/°C around 25 °C. We study the effects of hole dimensions and fabrication imperfections on the performance of the proposed PMPCF and demonstrate that the PMPCF has a good toleration to any geometrical induced imperfections in the fabrication process of the fiber. Furthermore, we show that the spectral range of the sensor can be easily improved (to values larger than 137 nm) by decreasing the infiltration length of the PMPCF.
Highlights
In conventional optical fibers, maintaining the polarization state of the guided mode along the fiber length is extremely difficult due to the circularly symmetric structure of the fiber [1]
If one infiltrates the whole length of polarization maintaining photonic crystal fibers (PMPCFs) (L1 = L or σ = L1/L = 1), Φ1 = 0 and the spectrum only depends on Φ2
We investigated toluene-filled polarization maintaining photonic crystal fibers (PMPCFs) for temperature sensing applications via Sagnac interferometer using numerical simulations and theoretical models
Summary
In conventional optical fibers, maintaining the polarization state of the guided mode along the fiber length is extremely difficult due to the circularly symmetric structure of the fiber [1]. Qian et al [11] proposed an alcohol-filled PCF temperature sensor with a sensitivity of 6.6 nm/°C. Lu et al [12] proposed a temperature sensor based on a PCF filled with silver nanowires and liquid, and achieved a sensitivity of 2.7 nm/°C.
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