Modeling and measurement of temperature sensitivity in birefringent photonic crystal holey fibers
ABSTRACT We analyzed theoretically the spectral dependence of polarimetric sensitivity to temperature (KT) and the susceptibility of phase modal birefringence to temperature (dB/dT) in several birefringent photonic crystal holey fibers of different construction. Contributions to dB/dT related to thermal expansion of the fiber dimensions and that related to temperature-induced changes in glass and air refractive indices were calculated separately. Our results showed that dB/dT depends strongly on the material used for manufacturing the fiber and on the fiber's geometry. We demonstrate that, by properly designing the birefringent holey fiber, it is possible to reduce its temperature sensitivity significantly and even to ensure a null response to temperature at a specific wavelength. Furthermore, we show that the temperature sensitivity in a fiber with arbitrary geometry can be significantly reduced by proper choice of the glass used in the fiber's manufacture. We also measured the polarimetric sensitivity to temperature and identified its sign in two silica-air fibers. The experimental values are in good agreement with the results of modeling.
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- "It is well known that photonic crystal fibers (PCFs) can exhibit much higher birefringence values than their conventional counter parts such as bow tie and panda type optical fibers. Since the birefringence in PCFs results from the asymmetric distribution of the refractive index in the fiber cross-section, not form stress induced phenomena, they are highly sensitive to temperature variations  and, therefore, good candidates for various mechanical sensors such as strain, stress or pressure . There are several methods proposed to break symmetry and achieve the asymmetric distribution of the field in PCFs including elliptical cores , small air holes in the core , varied sizes of circular holes in the cladding   and adding large air holes outside the cladding . "
ABSTRACT: We present a dual mode, large core highly birefringent photonic crystal fiber with a photonic cladding composed of elliptical holes ordered in a rectangular lattice. The fiber is made of borosilicate glass and has a regular set of elliptical holes with an aspect ratio of 1.27 and a filling factor near 0.5. The group birefringence (G) and effective mode area were measured at 1550 nm for the fundamental mode and were found to equal 2 × 10−4 and 20 μm2 respectively. We discuss the influence of structural parameters including the ellipticity of the air holes and the aspect ratio of the rectangular lattice on the birefringence and on the fundamental and second modes of the fiber.Optical Fiber Technology 07/2012; 18(4):220–225. DOI:10.1016/j.yofte.2012.04.004 · 1.19 Impact Factor
Journal of Lightwave Technology 04/2011; 29:943-948. DOI:10.1109/JLT.2011.2109370 · 2.86 Impact Factor
- "The simulation process includes two steps: first calculate the geometrical deformation under a high temperature of 500 C, and then use it as well as thermo-optic effect induced change in refractive index as input data to simulate effective indexes of the two polarized fundamental modes. The constants used in the simulation are as follows: thermal expansion coeffi- cient K , thermo-optic coefficients K and K . Finally, the polarimetric temperature sensitivity of Fiber (D) was calculated to be K . "
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- "In order to confirm that our HB-PCF is extremely insensitive to temperature, we measured the temperature-induced peak wavelength shifts by using the temperature-controlled oven with a resolution of 1 C. Fig. 6 shows the peak wavelength shifts at different temperatures up to 100 C. These were observed to be very small with 4.6 and 2.6 pm C due to a single material composition and the unique structure . Thus, the temperature-induced effects need not to be considered and (2) is available for torsion sensing. "
ABSTRACT: We report on enhanced torsion sensitivity by using a highly birefringent photonic crystal fiber (HB-PCF)-based Sagnac interferometer. In order to increase the torsion sensitivity, we introduced an anisotropic microstructure into the cross section of an HB-PCF by enlarging the size of air holes of one row. This can result in a high birefringence of the order of 10<sup>-3</sup> and low sensitivities to bending and temperature. The torsion sensitivity was measured to be high with ~0.06 nm/°.IEEE Photonics Technology Letters 11/2010; 22(20-22):1539 - 1541. DOI:10.1109/LPT.2010.2068043 · 2.18 Impact Factor