Determination of nonlinear coefficient and group-velocity-dispersion of bismuth-based high nonlinear optical fiber by four-wave-mixing |
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Authors: | Tomoharu Hasegawa Tatsuo Nagashima Naoki Sugimoto |
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Affiliation: | Asahi Glass Co., Ltd., Research Center, 1150, Hazawa-cho, Kanagawa-ku, Yokohama 221-8755, Japan |
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Abstract: | Nonlinear coefficient and group-velocity-dispersion of bismuth-based nonlinear fibers were determined by four-wave-mixing measurements. The wavelength dependence of refractive index of bulk bismuth-based glasses was also measured to estimate the material dispersion and waveguide dispersion. A newly developed bi-directional four-wave-mixing configuration enabled us to determine all fiber parameters simultaneously. The obtained fiber nonlinearity γ ∼ 1000 W−1 km−1 of bismuth-based nonlinear fiber is the highest one in the step-index fiber made of oxide glasses as expected from a high refractive index at 1550 nm. Dispersion analysis reveals that the both material dispersion and waveguide dispersion affect to the large group-velocity-dispersion of bismuth-based nonlinear fiber. |
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Keywords: | 42.65.Wi 42.70.Ce 42.81.Wg |
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