Group index dispersion of holey fibres measured by a white-light spectral interferometric technique |
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| Authors: | P Hlubina D Ciprian R Chlebus |
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| Institution: | 1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore;2. School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore;1. School of Electrical Engineering, Pukyong National University, Yongso-ro 45, Nam-gu, Busan 608-737, Korea;2. Interdisciplinary Program of Marine-Bio, Electrical & Mechanical Engineering, Pukyong National University, Yongso-ro 45, Nam-gu, Busan 608-737, Korea;3. Specialized Graduate School of Science and Technology Convergence, Pukyong National University, Sinseon-ro 365, Nam-gu, Busan 608-739, Korea;1. Department of Physics, Technical University Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic;2. Laboratory of Optical Fibre Technology, Maria Curie-Sklodowska University, Pl. M. Curie-Sklodowskiej 3, 20-031 Lublin, Poland;1. School of Physics and Optoelectronic Technology, Dalian University of Technology, 2 Linggong Road, Ganjingzi District, Dalian 116024, People''s Republic of China;2. College of Physics and Materials Engineering, Dalian Nationalities University, 18 Liaohe West Road, JinZhou New District, Dalian 116600, People''s Republic of China |
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| Abstract: | We present a new white-light interferometric technique to measure the group index of holey fibres over a wide wavelength range. The technique utilizes an unbalanced Mach–Zehnder interferometer with a fibre under test of known length placed in one of the interferometer arms and the other arm with adjustable path length. In a first step, the differential group index of the fibre is measured over a wide wavelength range. In a second step, the fibre is replaced by the reference sample of known thickness and group dispersion to determine precisely the group index of the fibre at one specific wavelength. The group index as a function of wavelength is measured for two different holey fibres, one made of pure silica glass and the other made of SK222 glass. For both fibres, the wavelength dependence of the group index of the outer cladding and modes supported by the fibre is measured. |
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