The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform
Daru Chen - One of the best experts on this subject based on the ideXlab platform.
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stable multi wavelength erbium doped fiber laser based on a photonic crystal fiber sagnac loop filter
Laser Physics Letters, 2007Co-Authors: Daru ChenAbstract:A multi-wavelength erbium-doped fiber laser based on a Sagnac loop fiber which is formed by a birefringent and highly nonlinear photonic crystal fiber (PCF), a 3-dB Optical Coupler and two polariza ...
Youichi Sakakibara - One of the best experts on this subject based on the ideXlab platform.
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broad band surface Optical Coupler based on a sio2 capped vertically curved silicon waveguide
Optics Express, 2018Co-Authors: Yuki Atsumi, Emiko Omoda, Tomoya Yoshida, Youichi SakakibaraAbstract:A chip-surface Optical Coupler based on a vertically curved Si waveguide was demonstrated for coupling with high-numerical-aperture single-mode Optical fibers with a mode-field diameter of 5 µm. This device features a dome-like SiO2 Coupler cap, which acts as collimation lens. We succeeded in fabricating this structure using an isotropic SiO2 deposition technique employing plasma-enhanced chemical vapor deposition and obtained a light output that approximates that of a 5-µm-waist Gaussian beam. The fabricated Coupler showed a coupling loss of less than 4.2 dB and a 0.5-dB-loss bandwidth above 150 nm for TE-polarized light.
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design of compact surface Optical Coupler based on vertically curved silicon waveguide for high numerical aperture single mode Optical fiber
Japanese Journal of Applied Physics, 2017Co-Authors: Yuki Atsumi, Emiko Omoda, Tomoya Yoshida, Youichi SakakibaraAbstract:A surface Optical Coupler based on a vertically curved Si waveguide was designed for coupling with high-numerical aperture single-mode Optical fibers with a mode-field diameter of 5 µm. This Coupler has a quite small device size, with a height of approximately 12 µm, achieved by introducing an effective spot-size converter configured with the combination of an extremely short Si exponential-inverse taper and a dome-structured SiO2 lens formed on the Coupler top. The designed Coupler shows high-efficiency Optical coupling, with a loss of 0.8 dB for TE polarized light, as well as broad-band coupling with a 0.5-dB-loss band of 420 nm.
Yuki Atsumi - One of the best experts on this subject based on the ideXlab platform.
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broad band surface Optical Coupler based on a sio2 capped vertically curved silicon waveguide
Optics Express, 2018Co-Authors: Yuki Atsumi, Emiko Omoda, Tomoya Yoshida, Youichi SakakibaraAbstract:A chip-surface Optical Coupler based on a vertically curved Si waveguide was demonstrated for coupling with high-numerical-aperture single-mode Optical fibers with a mode-field diameter of 5 µm. This device features a dome-like SiO2 Coupler cap, which acts as collimation lens. We succeeded in fabricating this structure using an isotropic SiO2 deposition technique employing plasma-enhanced chemical vapor deposition and obtained a light output that approximates that of a 5-µm-waist Gaussian beam. The fabricated Coupler showed a coupling loss of less than 4.2 dB and a 0.5-dB-loss bandwidth above 150 nm for TE-polarized light.
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design of compact surface Optical Coupler based on vertically curved silicon waveguide for high numerical aperture single mode Optical fiber
Japanese Journal of Applied Physics, 2017Co-Authors: Yuki Atsumi, Emiko Omoda, Tomoya Yoshida, Youichi SakakibaraAbstract:A surface Optical Coupler based on a vertically curved Si waveguide was designed for coupling with high-numerical aperture single-mode Optical fibers with a mode-field diameter of 5 µm. This Coupler has a quite small device size, with a height of approximately 12 µm, achieved by introducing an effective spot-size converter configured with the combination of an extremely short Si exponential-inverse taper and a dome-structured SiO2 lens formed on the Coupler top. The designed Coupler shows high-efficiency Optical coupling, with a loss of 0.8 dB for TE polarized light, as well as broad-band coupling with a 0.5-dB-loss band of 420 nm.
Connie J Changhasnai - One of the best experts on this subject based on the ideXlab platform.
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very high efficiency Optical Coupler for silicon nanophotonic waveguide and single mode Optical fiber
Optics Express, 2017Co-Authors: Li Zhu, Weijia Yang, Connie J ChanghasnaiAbstract:Integrated Optical circuits are poised to open up an array of novel applications. A vibrant field of research has emerged around the monolithic integration of Optical components onto the silicon substrates. Typically, single mode Optical fibers deliver the external light to the chip, and submicron single-mode waveguides then guide the light on-chip for further processing. For such technology to be viable, it is critically important to be able to efficiently couple light into and out of the chip platform, and between the different components, with low losses. Due to the large volume mismatch between a fiber and silicon waveguide (on the order of 600), it has been extremely challenging to obtain high coupling efficient with large tolerance. To date, demonstrated coupling has been relatively lossy and effective coupling requires impractical alignment of Optical components. Here, we propose the use of a high contrast metastructure (HCM) that overcomes these issues, and effectively couples the off-chip, out-of-plane light waves into on-chip, in-plane waveguides. By harnessing the resonance properties of the metastructure, we show that it is possible to spatially confine the incoming free-space light into subwavelength dimensions with a near-unity (up to 98%) efficiency. The underlying coupling mechanism is analyzed and designs for practical on-chip Coupler and reflector systems are presented. Furthermore, we explore the two-dimensional HCM as an ultra-compact wavelength multiplexer with superior efficiency (90%).
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novel high efficiency vertical to in plane Optical Coupler
Proceedings of SPIE, 2012Co-Authors: Li Zhu, Vadim Karagodsky, Connie J ChanghasnaiAbstract:We propose a novel vertical Optical Coupler using subwavelength high contrast grating. The surface normal incidence light can be coupled into the in-plane waveguide with peak efficiency of 92% over a broad wavelength range. Such structure can be also designed as the in-plane reflector or in-plane to vertical Coupler. The reflectivity for waveguide propagation mode is 97.5% and the coupling efficiency is 96%, respectively.
Tomoya Yoshida - One of the best experts on this subject based on the ideXlab platform.
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broad band surface Optical Coupler based on a sio2 capped vertically curved silicon waveguide
Optics Express, 2018Co-Authors: Yuki Atsumi, Emiko Omoda, Tomoya Yoshida, Youichi SakakibaraAbstract:A chip-surface Optical Coupler based on a vertically curved Si waveguide was demonstrated for coupling with high-numerical-aperture single-mode Optical fibers with a mode-field diameter of 5 µm. This device features a dome-like SiO2 Coupler cap, which acts as collimation lens. We succeeded in fabricating this structure using an isotropic SiO2 deposition technique employing plasma-enhanced chemical vapor deposition and obtained a light output that approximates that of a 5-µm-waist Gaussian beam. The fabricated Coupler showed a coupling loss of less than 4.2 dB and a 0.5-dB-loss bandwidth above 150 nm for TE-polarized light.
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design of compact surface Optical Coupler based on vertically curved silicon waveguide for high numerical aperture single mode Optical fiber
Japanese Journal of Applied Physics, 2017Co-Authors: Yuki Atsumi, Emiko Omoda, Tomoya Yoshida, Youichi SakakibaraAbstract:A surface Optical Coupler based on a vertically curved Si waveguide was designed for coupling with high-numerical aperture single-mode Optical fibers with a mode-field diameter of 5 µm. This Coupler has a quite small device size, with a height of approximately 12 µm, achieved by introducing an effective spot-size converter configured with the combination of an extremely short Si exponential-inverse taper and a dome-structured SiO2 lens formed on the Coupler top. The designed Coupler shows high-efficiency Optical coupling, with a loss of 0.8 dB for TE polarized light, as well as broad-band coupling with a 0.5-dB-loss band of 420 nm.