The Experts below are selected from a list of 120588 Experts worldwide ranked by ideXlab platform
Oskar Painter - One of the best experts on this subject based on the ideXlab platform.
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Highly efficient Coupling from an optical fiber to a nanoscale silicon optomechanical cavity
Applied Physics Letters, 2013Co-Authors: Simon Groblacher, Amir H. Safavi-naeini, Jasper Chan, Jeff T Hill, Oskar PainterAbstract:We demonstrate highly efficient Coupling of light from an optical fiber to a silicon photonic crystal optomechanical cavity. The fiber-to-cavity Coupling utilizes a compact (L ~ 25 um) intermediate adiabatic coupler. The optical Coupling is lithographically controlled, broadband, relatively insensitive to fiber misalignment, and allows for light to be transferred from an optical fiber to, in principle, any photonic chip with refractive index greater than that of the optical fiber. Here we demonstrate single-sided cavity Coupling with a total fiber-to-cavity optical Power Coupling efficiency of 85%.
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experimental demonstration of fiber accessible metal nanoparticle plasmon waveguides for planar energy guiding and sensing
Applied Physics Letters, 2005Co-Authors: Stefan A Maier, Michelle D Friedman, Paul E Barclay, Oskar PainterAbstract:Experimental evidence of mode-selective evanescent Power Coupling at telecommunication frequencies with efficiencies up to 75% from a tapered optical fiber to a metal nanoparticle plasmon waveguide is presented. The waveguide consists of a two-dimensional square lattice of lithographically defined Au nanoparticles on an optically thin silicon membrane. The dispersion and attenuation properties of the waveguide are analyzed using the fiber taper. The high efficiency of Power transfer into these waveguides solves the Coupling problem between conventional optics and plasmonic devices and could lead to the development of highly efficient plasmonic sensors and optical switches.
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experimental demonstration of fiber accessible metal nanoparticle plasmon waveguides for planar energy guiding and sensing
arXiv: Optics, 2004Co-Authors: Stefan A Maier, Michelle D Friedman, Paul E Barclay, Oskar PainterAbstract:Experimental evidence of mode-selective evanescent Power Coupling at telecommunication frequencies with efficiencies up to 75 % from a tapered optical fiber to a carefully designed metal nanoparticle plasmon waveguide is presented. The waveguide consists of a two-dimensional square lattice of lithographically defined Au nanoparticles on an optically thin silicon membrane. The dispersion and attenuation properties of the waveguide are analyzed using the fiber taper. The high efficiency of Power transfer into these waveguides solves the Coupling problem between conventional optics and plasmonic devices and could lead to the development of highly efficient plasmonic sensors and optical switches.
Shoichiro Matsuo - One of the best experts on this subject based on the ideXlab platform.
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analytical expression of average Power Coupling coefficients for estimating intercore crosstalk in multicore fibers
IEEE Photonics Journal, 2012Co-Authors: Masanori Koshiba, Katsuhiro Takenaga, Kunimasa Saitoh, Shoichiro MatsuoAbstract:In order to realize fast and accurate estimation of intercore crosstalk in bent multicore fibers (MCFs), an analytical expression of the average Power-Coupling coefficient (PCC) based on an exponential autocorrelation function is, for the first time, derived, resulting in no need for heavy numerical computations. It is revealed that, when the bending radius is large and the correlation length is large, the average PCC is inversely proportional to the correlation length and to the square of the propagation constant difference Δβmn between core m and core n, and when the bending radius is small and the correlation length is large, the average PCC is proportional to the bending radius and is independent of the correlation length. When the correlation length is small, on the other hand, the average PCC is proportional to the correlation length and is independent of the bending radius. For homogeneous MCFs (Δβmn = 0) with small bending radius, the average PCC coincides with the mean crosstalk increase per unit length derived from the coupled-mode theory of Hayashi et al. that is proportional to the bending radius. Average crosstalk values calculated by using the analytical expression derived here are in excellent agreement with those of numerical solutions of coupled-Power equations, irrespective of the values of bending radius and correlation length.
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multi core fiber design and analysis coupled mode theory and coupled Power theory
Optics Express, 2011Co-Authors: Masanori Koshiba, Katsuhiro Takenaga, Kunimasa Saitoh, Shoichiro MatsuoAbstract:Coupled-mode and coupled-Power theories are described for multi-core fiber design and analysis. First, in order to satisfy the law of Power conservation, mode-Coupling coefficients are redefined and then, closed-form Power-Coupling coefficients are derived based on exponential, Gaussian, and triangular autocorrelation functions. Using the coupled-mode and coupled-Power theories, impacts of random phase-offsets and correlation lengths on crosstalk in multi-core fibers are investigated for the first time. The simulation results are in good agreement with the measurement results. Furthermore, from the simulation results obtained by both theories, it is confirmed that the reciprocity is satisfied in multi-core fibers.
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an investigation on crosstalk in multi core fibers by introducing random fluctuation along longitudinal direction
IEICE Transactions on Communications, 2011Co-Authors: Katsuhiro Takenaga, Ning Guan, Yoko Arakawa, Shoichiro Matsuo, Shoji Tanigawa, Kunimasa Saitoh, Masanori KoshibaAbstract:The length dependence of the crosstalk in multi-core fibers has been investigated by introducing random fluctuation along longitudinal direction. The Power Coupling coefficients in the coupled-Power theory in heterogeneous multi-core fiber with seven cores were estimated based on consideration of the Power Coupling coefficients of the homogeneous multi-core fiber. The crosstalk can be quantitatively evaluated by employing coupled-Power theory instead of coupled-mode theory.
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Multimode fibers for compensating intermodal dispersion of graded-index multimode fibers
Journal of Lightwave Technology, 2004Co-Authors: N. Guan, Shoichiro Matsuo, Katsuhiro Takenaga, Kuniharu HimenoAbstract:This paper proposes a novel type of multimode dispersion compensation fiber (MM-DCF) by which the intermodal dispersion of multimode fibers (MMFs) can be effectively compensated. A theoretical model that precisely calculates the group velocities of a target MMF and its MM-DCF and the Power Coupling between the two fibers is applied to confirm the proposal presented here. As a demonstration of the operation of the MM-DCF, an MMF optimized for transmission at a wavelength of 850 nm is compensated by the MM-DCF, and its overfilled launch bandwidth at a wavelength of 1300 nm is enhanced from 0.62 to 2.56GHz/spl middot/km.
Masanori Koshiba - One of the best experts on this subject based on the ideXlab platform.
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physical interpretation of intercore crosstalk in multicore fiber effects of macrobend structure fluctuation and microbend
Optics Express, 2013Co-Authors: Tetsuya Hayashi, Takashi Sasaki, Eisuke Sasaoka, Masanori KoshibaAbstract:We have derived an intuitively interpretable expression of the average Power-Coupling coefficient for estimating the inter-core crosstalk of the multicore fiber. Based on the derived expression, we discuss how the structure fluctuation and macrobend can affect the crosstalk, and organize previously reported methods for crosstalk suppression. We also discuss how the microbending can affect the crosstalk in homogeneous and heterogeneous MCFs, based on the derived expression and previously reported measurement results.
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analytical expression of average Power Coupling coefficients for estimating intercore crosstalk in multicore fibers
IEEE Photonics Journal, 2012Co-Authors: Masanori Koshiba, Katsuhiro Takenaga, Kunimasa Saitoh, Shoichiro MatsuoAbstract:In order to realize fast and accurate estimation of intercore crosstalk in bent multicore fibers (MCFs), an analytical expression of the average Power-Coupling coefficient (PCC) based on an exponential autocorrelation function is, for the first time, derived, resulting in no need for heavy numerical computations. It is revealed that, when the bending radius is large and the correlation length is large, the average PCC is inversely proportional to the correlation length and to the square of the propagation constant difference Δβmn between core m and core n, and when the bending radius is small and the correlation length is large, the average PCC is proportional to the bending radius and is independent of the correlation length. When the correlation length is small, on the other hand, the average PCC is proportional to the correlation length and is independent of the bending radius. For homogeneous MCFs (Δβmn = 0) with small bending radius, the average PCC coincides with the mean crosstalk increase per unit length derived from the coupled-mode theory of Hayashi et al. that is proportional to the bending radius. Average crosstalk values calculated by using the analytical expression derived here are in excellent agreement with those of numerical solutions of coupled-Power equations, irrespective of the values of bending radius and correlation length.
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multi core fiber design and analysis coupled mode theory and coupled Power theory
Optics Express, 2011Co-Authors: Masanori Koshiba, Katsuhiro Takenaga, Kunimasa Saitoh, Shoichiro MatsuoAbstract:Coupled-mode and coupled-Power theories are described for multi-core fiber design and analysis. First, in order to satisfy the law of Power conservation, mode-Coupling coefficients are redefined and then, closed-form Power-Coupling coefficients are derived based on exponential, Gaussian, and triangular autocorrelation functions. Using the coupled-mode and coupled-Power theories, impacts of random phase-offsets and correlation lengths on crosstalk in multi-core fibers are investigated for the first time. The simulation results are in good agreement with the measurement results. Furthermore, from the simulation results obtained by both theories, it is confirmed that the reciprocity is satisfied in multi-core fibers.
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an investigation on crosstalk in multi core fibers by introducing random fluctuation along longitudinal direction
IEICE Transactions on Communications, 2011Co-Authors: Katsuhiro Takenaga, Ning Guan, Yoko Arakawa, Shoichiro Matsuo, Shoji Tanigawa, Kunimasa Saitoh, Masanori KoshibaAbstract:The length dependence of the crosstalk in multi-core fibers has been investigated by introducing random fluctuation along longitudinal direction. The Power Coupling coefficients in the coupled-Power theory in heterogeneous multi-core fiber with seven cores were estimated based on consideration of the Power Coupling coefficients of the homogeneous multi-core fiber. The crosstalk can be quantitatively evaluated by employing coupled-Power theory instead of coupled-mode theory.
Stefan A Maier - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of fiber accessible metal nanoparticle plasmon waveguides for planar energy guiding and sensing
Applied Physics Letters, 2005Co-Authors: Stefan A Maier, Michelle D Friedman, Paul E Barclay, Oskar PainterAbstract:Experimental evidence of mode-selective evanescent Power Coupling at telecommunication frequencies with efficiencies up to 75% from a tapered optical fiber to a metal nanoparticle plasmon waveguide is presented. The waveguide consists of a two-dimensional square lattice of lithographically defined Au nanoparticles on an optically thin silicon membrane. The dispersion and attenuation properties of the waveguide are analyzed using the fiber taper. The high efficiency of Power transfer into these waveguides solves the Coupling problem between conventional optics and plasmonic devices and could lead to the development of highly efficient plasmonic sensors and optical switches.
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experimental demonstration of fiber accessible metal nanoparticle plasmon waveguides for planar energy guiding and sensing
arXiv: Optics, 2004Co-Authors: Stefan A Maier, Michelle D Friedman, Paul E Barclay, Oskar PainterAbstract:Experimental evidence of mode-selective evanescent Power Coupling at telecommunication frequencies with efficiencies up to 75 % from a tapered optical fiber to a carefully designed metal nanoparticle plasmon waveguide is presented. The waveguide consists of a two-dimensional square lattice of lithographically defined Au nanoparticles on an optically thin silicon membrane. The dispersion and attenuation properties of the waveguide are analyzed using the fiber taper. The high efficiency of Power transfer into these waveguides solves the Coupling problem between conventional optics and plasmonic devices and could lead to the development of highly efficient plasmonic sensors and optical switches.
Katsuhiro Takenaga - One of the best experts on this subject based on the ideXlab platform.
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analytical expression of average Power Coupling coefficients for estimating intercore crosstalk in multicore fibers
IEEE Photonics Journal, 2012Co-Authors: Masanori Koshiba, Katsuhiro Takenaga, Kunimasa Saitoh, Shoichiro MatsuoAbstract:In order to realize fast and accurate estimation of intercore crosstalk in bent multicore fibers (MCFs), an analytical expression of the average Power-Coupling coefficient (PCC) based on an exponential autocorrelation function is, for the first time, derived, resulting in no need for heavy numerical computations. It is revealed that, when the bending radius is large and the correlation length is large, the average PCC is inversely proportional to the correlation length and to the square of the propagation constant difference Δβmn between core m and core n, and when the bending radius is small and the correlation length is large, the average PCC is proportional to the bending radius and is independent of the correlation length. When the correlation length is small, on the other hand, the average PCC is proportional to the correlation length and is independent of the bending radius. For homogeneous MCFs (Δβmn = 0) with small bending radius, the average PCC coincides with the mean crosstalk increase per unit length derived from the coupled-mode theory of Hayashi et al. that is proportional to the bending radius. Average crosstalk values calculated by using the analytical expression derived here are in excellent agreement with those of numerical solutions of coupled-Power equations, irrespective of the values of bending radius and correlation length.
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multi core fiber design and analysis coupled mode theory and coupled Power theory
Optics Express, 2011Co-Authors: Masanori Koshiba, Katsuhiro Takenaga, Kunimasa Saitoh, Shoichiro MatsuoAbstract:Coupled-mode and coupled-Power theories are described for multi-core fiber design and analysis. First, in order to satisfy the law of Power conservation, mode-Coupling coefficients are redefined and then, closed-form Power-Coupling coefficients are derived based on exponential, Gaussian, and triangular autocorrelation functions. Using the coupled-mode and coupled-Power theories, impacts of random phase-offsets and correlation lengths on crosstalk in multi-core fibers are investigated for the first time. The simulation results are in good agreement with the measurement results. Furthermore, from the simulation results obtained by both theories, it is confirmed that the reciprocity is satisfied in multi-core fibers.
-
an investigation on crosstalk in multi core fibers by introducing random fluctuation along longitudinal direction
IEICE Transactions on Communications, 2011Co-Authors: Katsuhiro Takenaga, Ning Guan, Yoko Arakawa, Shoichiro Matsuo, Shoji Tanigawa, Kunimasa Saitoh, Masanori KoshibaAbstract:The length dependence of the crosstalk in multi-core fibers has been investigated by introducing random fluctuation along longitudinal direction. The Power Coupling coefficients in the coupled-Power theory in heterogeneous multi-core fiber with seven cores were estimated based on consideration of the Power Coupling coefficients of the homogeneous multi-core fiber. The crosstalk can be quantitatively evaluated by employing coupled-Power theory instead of coupled-mode theory.
-
Multimode fibers for compensating intermodal dispersion of graded-index multimode fibers
Journal of Lightwave Technology, 2004Co-Authors: N. Guan, Shoichiro Matsuo, Katsuhiro Takenaga, Kuniharu HimenoAbstract:This paper proposes a novel type of multimode dispersion compensation fiber (MM-DCF) by which the intermodal dispersion of multimode fibers (MMFs) can be effectively compensated. A theoretical model that precisely calculates the group velocities of a target MMF and its MM-DCF and the Power Coupling between the two fibers is applied to confirm the proposal presented here. As a demonstration of the operation of the MM-DCF, an MMF optimized for transmission at a wavelength of 850 nm is compensated by the MM-DCF, and its overfilled launch bandwidth at a wavelength of 1300 nm is enhanced from 0.62 to 2.56GHz/spl middot/km.
