The Experts below are selected from a list of 44319 Experts worldwide ranked by ideXlab platform
Shayan Mookherjea - One of the best experts on this subject based on the ideXlab platform.
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low power continuous wave four wave mixing in silicon coupled resonator Optical Waveguides
Optics Letters, 2011Co-Authors: Jun Rong Ong, Michael L Cooper, Greeshma Gupta, William M J Green, Solomon Assefa, Fengnian Xia, Shayan MookherjeaAbstract:We demonstrate four-wave mixing in silicon-on-insulator coupled-resonator Optical Waveguides consisting of 35 and 65 microring resonators, using a cw pump with coupled power below 20 mW and observed parametric conversion across more than 10 THz. The conversion efficiency is enhanced by +16 dB relative to a silicon straight waveguide of equivalent length, due to the slowing factor of the coupled-resonator structure.
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statistics of light transport in 235 ring silicon coupled resonator Optical Waveguides
Optics Express, 2010Co-Authors: Michael L Cooper, Yurii A Vlasov, Greeshma Gupta, Mark A Schneider, William M J Green, Solomon Assefa, Fengnian Xia, Shayan MookherjeaAbstract:In contrast to recent reports of localization-impaired transport in long slow-light Waveguides, we demonstrate light transport in silicon coupled-resonator Optical Waveguides (CROWs) consisting of up to 235 coupled microrings without localization over frequency bands that are several hundred gigahertz wide. Furthermore, from the unique statistical signatures provided by time-domain propagation delay measurements, we demonstrate the spectrally correlated nature of light propagation in CROWs.
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matrix analysis of microring coupled resonator Optical Waveguides
Optics Express, 2004Co-Authors: Joyce K S Poon, Shayan Mookherjea, Jacob Scheuer, George T Paloczi, Yanyi Huang, Amnon YarivAbstract:We use the coupling matrix formalism to investigate continuous-wave and pulse propagation through microring coupled-resonator Optical Waveguides (CROWs). The dispersion relation agrees with that derived using the tight-binding model in the limit of weak inter-resonator coupling. We obtain an analytical expression for pulse propagation through a semi-infinite CROW in the case of weak coupling which fully accounts for the nonlinear dispersive characteristics. We also show that intensity of a pulse in a CROW is enhanced by a factor inversely proportional to the inter-resonator coupling. In finite CROWs, anomalous dispersions allows for a pulse to propagate with a negative group velocity such that the output pulse appears to emerge before the input as in “superluminal” propagation. The matrix formalism is a powerful approach for microring CROWs since it can be applied to structures and geometries for which analyses with the commonly used tight-binding approach are not applicable.
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coupled resonator Optical Waveguides
IEEE Journal of Selected Topics in Quantum Electronics, 2002Co-Authors: Shayan Mookherjea, Amnon YarivAbstract:Properties of the recently introduced family of coupled resonator Optical Waveguides (CROWs) are reviewed, particularly with reference to CROWs designed as planar Waveguides in two-dimensional photonic crystal slabs to enhance nonlinear interactions and develop novel all-Optical information processing devices. Topics covered include: pulse propagation both in the nondispersive approximation and to all orders of dispersion, and the coupled mode theory of nonlinear optics with pulses in CROWs and its applications to second-harmonic generation and wave coupling via field-induced refractive-index gratings. We also review recent experimental progress in the fabrication and characterization of CROWs, and applications of the CROW concept to fiber gratings and microwave Waveguides.
Amnon Yariv - One of the best experts on this subject based on the ideXlab platform.
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transmission and group delay of microring coupled resonator Optical Waveguides
Optics Letters, 2006Co-Authors: Joyce K S Poon, Guy A Derose, Amnon YarivAbstract:We measured the transmission and group delay of microring coupled-resonator Optical Waveguides (CROWs). The CROWs consisted of 12 weakly coupled, microring resonators fabricated in Optical polymers (PMMA on Cytop). The intrinsic quality factor of the resonators was 18,000 and the interresonator coupling was 1%, resulting in a delay of 110-140 ps and a slowing factor of 23-29 over a 17 GHz bandwidth.
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coupled resonator Optical Waveguides toward the slowing and storage of light
Optics & Photonics News, 2005Co-Authors: Jacob Scheuer, Joyce K S Poon, George T Paloczi, Amnon YarivAbstract:The development of a simple, solid-state-based technology to slow the propagation of light could prove an important step in the realization of the high-bit-rate communication systems of the future. The use of coupled resonator Optical Waveguides (CROWs) as practical elements to slow and store light pulses is one possibility.
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matrix analysis of microring coupled resonator Optical Waveguides
Optics Express, 2004Co-Authors: Joyce K S Poon, Shayan Mookherjea, Jacob Scheuer, George T Paloczi, Yanyi Huang, Amnon YarivAbstract:We use the coupling matrix formalism to investigate continuous-wave and pulse propagation through microring coupled-resonator Optical Waveguides (CROWs). The dispersion relation agrees with that derived using the tight-binding model in the limit of weak inter-resonator coupling. We obtain an analytical expression for pulse propagation through a semi-infinite CROW in the case of weak coupling which fully accounts for the nonlinear dispersive characteristics. We also show that intensity of a pulse in a CROW is enhanced by a factor inversely proportional to the inter-resonator coupling. In finite CROWs, anomalous dispersions allows for a pulse to propagate with a negative group velocity such that the output pulse appears to emerge before the input as in “superluminal” propagation. The matrix formalism is a powerful approach for microring CROWs since it can be applied to structures and geometries for which analyses with the commonly used tight-binding approach are not applicable.
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coupled resonator Optical Waveguides
IEEE Journal of Selected Topics in Quantum Electronics, 2002Co-Authors: Shayan Mookherjea, Amnon YarivAbstract:Properties of the recently introduced family of coupled resonator Optical Waveguides (CROWs) are reviewed, particularly with reference to CROWs designed as planar Waveguides in two-dimensional photonic crystal slabs to enhance nonlinear interactions and develop novel all-Optical information processing devices. Topics covered include: pulse propagation both in the nondispersive approximation and to all orders of dispersion, and the coupled mode theory of nonlinear optics with pulses in CROWs and its applications to second-harmonic generation and wave coupling via field-induced refractive-index gratings. We also review recent experimental progress in the fabrication and characterization of CROWs, and applications of the CROW concept to fiber gratings and microwave Waveguides.
Takaaki Ishigure - One of the best experts on this subject based on the ideXlab platform.
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fabrication for y branched multimode polymer Optical Waveguides using the mosquito method
CPMT Symposium Japan, 2018Co-Authors: Tomoki Nakayama, Takaaki IshigureAbstract:In this paper, Y-branched multimode polymer Optical Waveguides are fabricated using the Mosquito method for applying them to multiplexing (MUX) devices for WDM transmission.
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axially tapered circular core polymer Optical Waveguides enabling highly efficient light coupling
Electronic Components and Technology Conference, 2017Co-Authors: Takaaki Ishigure, Kenji Katori, Hoshihiko Toda, Kazuki YasuharaAbstract:In this paper, we present axially tapered circular core polymer Optical Waveguides which allow high-efficiency light coupling between Optical components such as light sources, fibers/Waveguides, and detectors with a wide misalignment tolerance. We experimentally fabricate the taper shaped polymer Waveguides by applying imprinting method or the Mosquito method, and both experimentally and theoretically verify the high Optical functionality of the tapered Waveguides from the Optical packaging technology point of view.
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analysis of interchannel crosstalk in multimode parallel Optical Waveguides using the beam propagation method
Optics Express, 2014Co-Authors: Takuya Kudo, Takaaki IshigureAbstract:We theoretically analyze the origin of inter-channel crosstalk in densely aligned multimode parallel Optical Waveguides for on-board interconnects using the Beam Propagation Method. In this paper, we demonstrate that the inter-channel crosstalk due to mode coupling is very low in graded-index (GI) circular-core Waveguides because the propagation constants of the propagating modes are discrete. Additionally, it is also found that the Waveguides with GI-type circular cores is sensitive to the Optical confinement in the cladding: low-power cladding modes largely decrease the mode conversion.
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fabrication for low loss polymer Optical Waveguides with 90 bending using the mosquito method
CPMT Symposium Japan, 2014Co-Authors: Asami Takahashi, Takaaki IshigureAbstract:We fabricate graded index (GI) circular core multimode polymer Optical Waveguides with 90° bending using the Mosquito method, and demonstrate low bending loss even if the bend radius is as small as 1 mm.
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polymer Optical Waveguides with gi and w shaped cores for high bandwidth density on board interconnects
Journal of Lightwave Technology, 2013Co-Authors: Ryota Kinoshita, Kimio Moriya, Koji Choki, Takaaki IshigureAbstract:We fabricate polynorbornene-based graded-index (GI) core polymer Optical Waveguides using the photoaddressing method, and demonstrate that the GI-core polymer Waveguides are capable of realizing high-bandwidth-density on-board Optical interconnects. Because of the tight Optical confinement effect of the parabolic refractive index profile, the fabricated GI-core polymer Waveguides exhibit superior Optical properties compared to step-index (SI) core polymer Waveguides: low propagation loss, low connection loss with GI multimode fiber (MMF) with wide misalignment tolerance, and low interchannel crosstalk even under a small pitch size are experimentally confirmed. Furthermore, interchannel crosstalk due to multicore operation is experimentally evaluated, and a method to estimate the interchannel crosstalk in multimode polymer parallel Optical Waveguides under multicore operation is proposed for the first time, to the best of our knowledge. The photoaddressing method capable of fabricating even low-loss GI-core polymer waveguide circuits will pave the way for realizing low-cost and high-bandwidth-density Optical printed circuit boards.
Yurii A Vlasov - One of the best experts on this subject based on the ideXlab platform.
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statistics of light transport in 235 ring silicon coupled resonator Optical Waveguides
Optics Express, 2010Co-Authors: Michael L Cooper, Yurii A Vlasov, Greeshma Gupta, Mark A Schneider, William M J Green, Solomon Assefa, Fengnian Xia, Shayan MookherjeaAbstract:In contrast to recent reports of localization-impaired transport in long slow-light Waveguides, we demonstrate light transport in silicon coupled-resonator Optical Waveguides (CROWs) consisting of up to 235 coupled microrings without localization over frequency bands that are several hundred gigahertz wide. Furthermore, from the unique statistical signatures provided by time-domain propagation delay measurements, we demonstrate the spectrally correlated nature of light propagation in CROWs.
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coupled resonator Optical Waveguides based on silicon on insulator photonic wires
Applied Physics Letters, 2006Co-Authors: Fengnia Xia, Lidija Sekaric, Martin P Oboyle, Yurii A VlasovAbstract:Coupled resonator Optical Waveguides (CROWs) comprised of up to 16 racetrack resonators based on silicon-on-insulator (SOI) photonic wires were fabricated and characterized. The Optical properties of the CROWs were simulated using measured single resonator parameters based on a matrix approach. The group delay property of CROWs was also analyzed. The SOI based CROWs consisting of multiple resonators have extremely small footprints and can find applications in Optical filtering, dispersion compensation, and Optical buffering. Moreover, such CROW structure is a promising candidate for exploration of low light level nonlinear optics due to its resonant nature and compact mode size (∼0.1μm2) in photonic wire.
Masanori Koshiba - One of the best experts on this subject based on the ideXlab platform.
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full vectorial finite element beam propagation method with perfectly matched layers for anisotropic Optical Waveguides
Journal of Lightwave Technology, 2001Co-Authors: Kunimasa Saitoh, Masanori KoshibaAbstract:Perfectly matched layer (PML) boundary conditions are incorporated into the full-vectorial beam propagation method (BPM) based on a finite element scheme for the three-dimensional (3-D) anisotropic Optical waveguide analysis. In the present approach, edge elements based on linear-tangential and quadratic-normal vector basis functions are used for the transverse field components. To show the validity and usefulness of this approach, numerical examples are shown for Gaussian beam propagation in proton-exchanged LiNbO/sub 3/ Optical Waveguides. Numerical accuracy of the present PML boundary condition is investigated in detail by comparing the results with those of the conventional absorbing boundary condition (ABC).