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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ABSTRACT: A new procedure to obtain single-polarization single-mode polymeric optical fibers is reported. The selective polarization confinement loss mechanism is obtained by applying external hydrostatic pressure in a specially designed side-hole microstructured polymer optical fiber. It is shown that, at λ = 588 nm, pressure around 380 bar allows inducing confinement loss as high as 35 dB/m for one polarization state while the other is guided with low loss (3 ×10-3 dB/m). The loss mechanism is shown to be related to coupling between the fundamental core modes and the cladding modes of the pressurized fiber. Finally, the possibility of tuning the single-polarization single-mode state with the input wavelength with fixed pressure or by introducing small changes in the inner ring of holes of the fiber cross section is presented.Journal of Lightwave Technology 01/2011; 29(16):2372-2378. · 2.56 Impact Factor
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ABSTRACT: We demonstrate an efficient higher order rocking filter, which resonantly couples polarization modes guided in birefringent photonic crystal fibers. The grating was inscribed in the birefringent fiber with two large holes adjacent to the core by periodic mechanical twisting and heating with an arc fusion splicer. Because in photonic crystal fibers the phase birefringence is very dispersive and increases against wavelength, the phase matching between coupled modes can be obtained simultaneously at several wavelengths. In particular, we demonstrate that for the grating period Lambda =8 mm, resonant coupling can be obtained at three different wavelengths. The first order coupling (-13dB) is obtained for Lambda = LB . This condition is fulfilled at lambda = 856 nm. The second order coupling (-20dB) is obtained for Lambda = 2LB at lambda =1270 nm and the third order coupling (- 17dB) occurs for Lambda = 3LB at lambda =1623 nm. The length of the filter was 9.6 cm, which corresponds to 13 periodic twists. We also present the results of sensitivity measurements of this filter to hydrostatic pressure and temperature.Proc SPIE 12/2008;
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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. · 1.19 Impact Factor