The Experts below are selected from a list of 11034 Experts worldwide ranked by ideXlab platform
Ray T. Chen - One of the best experts on this subject based on the ideXlab platform.
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quasi vertical tapers for polymer waveguide based interboard optical interconnects
Photonics Research, 2015Co-Authors: Harish Subbaraman, Qiaochu Li, Xiaochuan Xu, Xingyu Zhang, Cheng Zhang, Ray T. ChenAbstract:A mode transformer based on the quasi-vertical taper is designed to enable high coupling efficiency for interboard-level optical interconnects involving single-mode polymer waveguides and standard single-mode fibers. A Triangular Region fabricated above the waveguide is adopted to adiabatically transform the mode from the fiber into the polymer waveguide. The effects of the geometrical parameters of the taper, including width, height, tip width, etc., on the coupling efficiency are numerically investigated. Based on this, a quasi-vertical taper for the polymer rib waveguide system is designed, fabricated, and characterized. Coupling losses of 1.79±0.30 and 2.23±0.31 dB per coupler for the quasi-TM and quasi-TE mode, respectively, are measured across the optical communication C and L bands (1535 to 1610 nm). Low-cost packaging, leading to widespread utilization of polymeric photonic devices, is envisioned for optical interconnect applications.
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High optical coupling efficiency quasi-vertical taper for polymer waveguide devices
Optical Interconnects XV, 2015Co-Authors: Zeyu Pan, Harish Subbaraman, Xingyu Zhang, Cheng Zhang, Yi Zou, L. Jay Guo, Ray T. ChenAbstract:Quasi-Vertical tapers are designed to enable high coupling efficiency from a conventional single mode fiber into a single mode polymer rib waveguide. A Triangular Region fabricated under the single mode waveguide is adopted to adiabatically transform the fiber mode into the polymer rib waveguide mode. This structure works as an optical mode transformer. Because the trenches are deeper at the facets than at the active Regions of the waveguide, the waveguide mode size in vertical direction becomes larger at the facets and can better match the input and output fiber mode. A coupling efficiency of 82.95% is achievable with a tip width of 1 μm .
Harish Subbaraman - One of the best experts on this subject based on the ideXlab platform.
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quasi vertical tapers for polymer waveguide based interboard optical interconnects
Photonics Research, 2015Co-Authors: Harish Subbaraman, Qiaochu Li, Xiaochuan Xu, Xingyu Zhang, Cheng Zhang, Ray T. ChenAbstract:A mode transformer based on the quasi-vertical taper is designed to enable high coupling efficiency for interboard-level optical interconnects involving single-mode polymer waveguides and standard single-mode fibers. A Triangular Region fabricated above the waveguide is adopted to adiabatically transform the mode from the fiber into the polymer waveguide. The effects of the geometrical parameters of the taper, including width, height, tip width, etc., on the coupling efficiency are numerically investigated. Based on this, a quasi-vertical taper for the polymer rib waveguide system is designed, fabricated, and characterized. Coupling losses of 1.79±0.30 and 2.23±0.31 dB per coupler for the quasi-TM and quasi-TE mode, respectively, are measured across the optical communication C and L bands (1535 to 1610 nm). Low-cost packaging, leading to widespread utilization of polymeric photonic devices, is envisioned for optical interconnect applications.
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High optical coupling efficiency quasi-vertical taper for polymer waveguide devices
Optical Interconnects XV, 2015Co-Authors: Zeyu Pan, Harish Subbaraman, Xingyu Zhang, Cheng Zhang, Yi Zou, L. Jay Guo, Ray T. ChenAbstract:Quasi-Vertical tapers are designed to enable high coupling efficiency from a conventional single mode fiber into a single mode polymer rib waveguide. A Triangular Region fabricated under the single mode waveguide is adopted to adiabatically transform the fiber mode into the polymer rib waveguide mode. This structure works as an optical mode transformer. Because the trenches are deeper at the facets than at the active Regions of the waveguide, the waveguide mode size in vertical direction becomes larger at the facets and can better match the input and output fiber mode. A coupling efficiency of 82.95% is achievable with a tip width of 1 μm .
Hamid Kellay - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Sand Dunes
Physical review letters, 2001Co-Authors: Yacine Amarouchene, Jean-françois Boudet, Hamid KellayAbstract:When sand falling in the spacing between two plates goes past an obstacle, a dynamic dune with a parabolic shape and an inner Triangular Region of nonflowing or slowly creeping sand forms. The angle of the Triangular zone increases with the height of the dune and saturates at a value determined by the geometry of the cell. The width of the dune, related to the radius of curvature at the tip, shows universal features versus its height rescaled by geometrical parameters. The velocity profile in the flowing part is determined and found to be nonlinear. The parabolic shape can be accounted for using a simple driven convection-diffusion equation for the interface.
Stephen Boedo - One of the best experts on this subject based on the ideXlab platform.
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A corrected displacement solution to linearly varying surface pressure over a Triangular Region on the elastic half-space
Tribology International, 2013Co-Authors: Stephen BoedoAbstract:Abstract This paper provides a closed-form derivation for the surface normal displacement at an arbitrary point on an elastic half-space subjected to linearly varying normal surface pressure over an arbitrarily shaped Triangular Region. For the special case of an equilateral triangle, the resulting displacements are shown to vanish at infinity, and the results agree with those obtained using numerical quadrature and with previously published solutions.
Syukuro Manabe - One of the best experts on this subject based on the ideXlab platform.
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model assessment of decadal variability and trends in the tropical pacific ocean
Journal of Climate, 1998Co-Authors: Thomas R Knutson, Syukuro ManabeAbstract:Abstract In this report, global coupled ocean–atmosphere models are used to explore possible mechanisms for observed decadal variability and trends in Pacific Ocean SSTs over the past century. The leading mode of internally generated decadal (>7 yr) variability in the model resembles the observed decadal variability in terms of pattern and amplitude. In the model, the pattern and time evolution of tropical winds and oceanic heat content are similar for the decadal and ENSO timescales, suggesting that the decadal variability has a similar “delayed oscillator” mechanism to that on the ENSO timescale. The westward phase propagation of the heat content anomalies, however, is slower and centered slightly farther from the equator (∼12° vs 9°N) for the decadal variability. Cool SST anomalies in the midlatitude North Pacific during the warm tropical phase of the decadal variability are induced in the model largely by oceanic advection anomalies. An index of observed SST over a broad Triangular Region of the tropi...
