The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Nadir Dagli - One of the best experts on this subject based on the ideXlab platform.
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Propagation Loss study of very compact gaas algaas substrate removed waveguides
Optics Express, 2009Co-Authors: Jaehyuk Shin, Yuchia Chang, Nadir DagliAbstract:Very compact GaAs/AlGaAs optical waveguides with Propagation Loss as low as 0.9 dB/cm at λ=1.55 μm were demonstrated using substrate removal and evaporated Si for index loading. Loss components were identified and minimized through process and waveguide design. Process induced roughness contributed significantly to overall Propagation Loss. Therefore a low damage process in addition to proper waveguide design is needed for Loss minimization.
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Propagation Loss and facet reflectivity of very compact substrate removed GaAs/AlGaAs waveguides at 1550 nm
LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2008Co-Authors: Jaehyuk Shin, Yuchia Chang, Nadir DagliAbstract:Facet reflectivity and Propagation Loss of very compact substrate removed GaAs/AlGaAs optical waveguides were studied both theoretically and experimentally. Propagation Loss as low as 1 dB/cm was demonstrated. The measured Propagation Loss correlates well with calculation.
P T Ho - One of the best experts on this subject based on the ideXlab platform.
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Propagation Loss in single mode gaas algaas microring resonators measurement and model
Journal of Lightwave Technology, 2001Co-Authors: P.p. Absil, J.v. Hryniewicz, P T HoAbstract:We report Propagation Loss measurements in single-mode GaAs-AlGaAs racetrack microresonators with bending radii from 2.7 /spl mu/m to 9.7 /spl mu/m. The experimental data were found to be in good agreement with a physical-Loss model which accounts for the bending Loss, the scattering Loss due to surface roughness on the waveguide sidewalls, and the transition Loss at the straight-to-bend waveguide junctions. The model also enables us to identify the dominant Loss mechanisms in semiconductor microcavities. We found that for racetracks with large bending radii (greater than 4 /spl mu/m, in our case) the Loss due to surface-roughness scattering in the curved waveguides dominates, whereas for small-radius rings, the modal mismatch at the straight-to-bend waveguide junctions causes the biggest Loss. This result suggests that circular-shaped rings are preferable in the realization of ultrasmall low-Loss microcavities. We also show that the round-trip Propagation Loss in small-radius racetrack microresonators can be minimized by introducing a lateral offset at the straight-to-bend waveguide junctions.
Jaehyuk Shin - One of the best experts on this subject based on the ideXlab platform.
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Propagation Loss study of very compact gaas algaas substrate removed waveguides
Optics Express, 2009Co-Authors: Jaehyuk Shin, Yuchia Chang, Nadir DagliAbstract:Very compact GaAs/AlGaAs optical waveguides with Propagation Loss as low as 0.9 dB/cm at λ=1.55 μm were demonstrated using substrate removal and evaporated Si for index loading. Loss components were identified and minimized through process and waveguide design. Process induced roughness contributed significantly to overall Propagation Loss. Therefore a low damage process in addition to proper waveguide design is needed for Loss minimization.
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Propagation Loss and facet reflectivity of very compact substrate removed GaAs/AlGaAs waveguides at 1550 nm
LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2008Co-Authors: Jaehyuk Shin, Yuchia Chang, Nadir DagliAbstract:Facet reflectivity and Propagation Loss of very compact substrate removed GaAs/AlGaAs optical waveguides were studied both theoretically and experimentally. Propagation Loss as low as 1 dB/cm was demonstrated. The measured Propagation Loss correlates well with calculation.
Eric Cassan - One of the best experts on this subject based on the ideXlab platform.
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Propagation Loss in single mode ultrasmall square silicon on insulator optical waveguides
Journal of Lightwave Technology, 2006Co-Authors: Frederic Grillot, Laurent Vivien, S Laval, Eric CassanAbstract:Silicon-on-insulator (SOI) optical waveguides insure high electromagnetic field confinement but suffer both from sidewall roughness responsible of scattering effects and from leakage toward the silicon substrate. These two mechanisms are the main sources of Loss in such optical waveguides. Considering the case of single-mode ultrasmall square SOI waveguides, Propagation Loss is calculated at telecommunication wavelengths taking into account these two Loss contributions. Leakage toward the substrate and scattering effects strongly depend on the waveguide size as well as on the operating wavelength.
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size influence on the Propagation Loss induced by sidewall roughness in ultrasmall soi waveguides
IEEE Photonics Technology Letters, 2004Co-Authors: Frederic Grillot, Laurent Vivien, S Laval, D Pascal, Eric CassanAbstract:Silicon-on-insulator (SOI) optical waveguides with high electromagnetic field confinement suffer from sidewall roughness which is responsible for strong scattering effects. This letter reports a numerical investigation on the size influence of ultrasmall SOI waveguides on the Propagation Loss due to sidewall roughness. It is shown that for a size smaller than 260 /spl times/ 260 nm the roughness-induced Propagation Loss decreases. As the optical mode confinement is reduced, a very low Loss light coupling from and to a single-mode fiber can be achieved with Propagation Loss as low as 0.5 dB/cm for a 150 /spl times/ 150 nm cross-sectional waveguide.
Yuchia Chang - One of the best experts on this subject based on the ideXlab platform.
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Propagation Loss study of very compact gaas algaas substrate removed waveguides
Optics Express, 2009Co-Authors: Jaehyuk Shin, Yuchia Chang, Nadir DagliAbstract:Very compact GaAs/AlGaAs optical waveguides with Propagation Loss as low as 0.9 dB/cm at λ=1.55 μm were demonstrated using substrate removal and evaporated Si for index loading. Loss components were identified and minimized through process and waveguide design. Process induced roughness contributed significantly to overall Propagation Loss. Therefore a low damage process in addition to proper waveguide design is needed for Loss minimization.
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Propagation Loss and facet reflectivity of very compact substrate removed GaAs/AlGaAs waveguides at 1550 nm
LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2008Co-Authors: Jaehyuk Shin, Yuchia Chang, Nadir DagliAbstract:Facet reflectivity and Propagation Loss of very compact substrate removed GaAs/AlGaAs optical waveguides were studied both theoretically and experimentally. Propagation Loss as low as 1 dB/cm was demonstrated. The measured Propagation Loss correlates well with calculation.
