Thermooptical Sensitivity Analysis of Highly Birefringent Polarimetric Sensing Photonic Crystal Fibers With Elliptically Elongated Veins

Abstract—The spectral and thermooptical sensitivity responses of highly birefringent photonic crystal fibers (PCFs) with el-liptically elongated veins integrated in their profile are being investigated using a novel sensitivity analysis based on an accurate semivectorial modal solver combined with temperature-dependent Sellmeier equations for pure silica and dry air. We demonstrate that by an appropriate selection of the design parameters it is possible to optimize the sensitivity of the modal birefringence or even to obtain null response at specific wavelengths. Thus, our investigation adds evidence to the potential use of highly birefrin-gent PCFs as polarimetric sensors. Optimized overall temperature sensitivity could be obtained up to 7 5 10 7K 1 at operational wavelength of 1.55 m. Index Terms—Photonic crystal fibers (PCFs), polarimetric sensors, sensitivity analysis, temperature-dependent Sellmeier equations, virtual boundary method. I