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Spectral-Domain Measurement of Strain Sensitivity of a Two-Mode Birefringent Side-Hole Fiber
Department of Physics, Technical University Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba,Czech Republic
Institute of Physics, Wroclaw University of Technology,Wybrze˙ze Wyspia´nskiego 27, 50-370 Wroclaw, Poland
Laboratory of Optical Fibre Technology, Maria Curie-Sklodowska University, Pl. M. Curie-Sklodowskiej 3, 20-031 Lublin, Poland
* Author to whom correspondence should be addressed.
Received: 12 July 2012; in revised form: 9 August 2012 / Accepted: 10 August 2012 / Published: 3 September 2012
Abstract: The strain sensitivity of a two-mode birefringent side-hole fiber is measured in the spectral domain. In a simple experimental setup comprising a broadband source, a polarizer, a two-mode birefringent side-hole fiber under varied elongations, an analyzer and a compact spectrometer, the spectral interferograms are resolved. These are characterized by the equalization wavelength at which spectral interference fringes have the highest visibility (the largest period) due to the zero group optical path difference between the fundamental, the LP01 mode and the higher-order, the LP11 mode. The spectral interferograms with the equalization wavelength are processed to retrieve the phase as a function of the wavelength. From the retrieved phase functions corresponding to different elongations of a two-mode birefringent side-hole fiber under test, the spectral strain sensitivity is obtained. Using this approach, the intermodal spectral strain sensitivity was measured for both x and y polarizations. Moreover, the spectral polarimetric sensitivity to strain was measured for the fundamental mode when a birefringent delay line was used in tandem with the fiber. Its spectral dependence was also compared with that obtained from a shift of the spectral interferograms not including the equalization wavelength, and good agreement was confirmed.
Keywords: microstructured fibers; polarization-maintaining fibers; fiber characterization; fiber optics sensors; interferometry
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MDPI and ACS Style
Hlubina, P.; Olszewski, J.; Martynkien, T.; Mergo, P.; Makara, M.; Poturaj, K.; Urbanczyk, W. Spectral-Domain Measurement of Strain Sensitivity of a Two-Mode Birefringent Side-Hole Fiber. Sensors 2012, 12, 12070-12081.
Hlubina P, Olszewski J, Martynkien T, Mergo P, Makara M, Poturaj K, Urbanczyk W. Spectral-Domain Measurement of Strain Sensitivity of a Two-Mode Birefringent Side-Hole Fiber. Sensors. 2012; 12(9):12070-12081.
Hlubina, Petr; Olszewski, Jacek; Martynkien, Tadeusz; Mergo, Pawel; Makara, Mariusz; Poturaj, Krzysztof; Urbanczyk, Waclaw. 2012. "Spectral-Domain Measurement of Strain Sensitivity of a Two-Mode Birefringent Side-Hole Fiber." Sensors 12, no. 9: 12070-12081.