Search Results - "FUJISAWA, Takeshi"

Low-loss, compact, and fabrication-tolerant Si-wire 90° waveguide bend using clothoid and normal curves for large scale photonic integrated circuits by Fujisawa, Takeshi, Makino, Shuntaro, Sato, Takanori, Saitoh, Kunimasa

“…Ultimately low-loss 90° waveguide bend composed of clothoid and normal curves is proposed for dense optical interconnect photonic integrated circuits. By using…”
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Arbitrary polarization and orbital angular momentum generation based on spontaneously broken degeneracy in helically twisted ring-core photonic crystal fibers by Fujisawa, Takeshi, Saitoh, Kunimasa

“…Using orbital angular momentum (OAM) as a spatial information channel attracts a lot of attention due to its infinite multiplexing capability. The research on…”
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Arbitrary higher-order optical spatial state generation by using spontaneously broken degeneracy modes in helically twisted ring-core hole assisted fibers by Fujisawa, Takeshi, Saitoh, Kunimasa

“…A helically twisted ring-core hole assisted fiber (HAF) is proposed for an arbitrary higher-order spatial state generation. In usual circular core fibers, HE…”
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Broadband and compact silicon mode converter designed using a wavefront matching method by Sawada, Yusuke, Fujisawa, Takeshi, Saitoh, Kunimasa

“…A broadband and compact TE0-TE1 mode converter for a mode division multiplexing system designed using a wavefront matching method is realized. We present the…”
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Broadband silicon four-mode multi/demultiplexer designed by a wavefront matching method by Sawada, Yusuke, Fujisawa, Takeshi, Sato, Takanori, Saitoh, Kunimasa

“…We propose a broadband silicon four-mode multi/demultiplexer which consists of three asymmetric directional couplers, and the asymmetric directional couplers…”
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The Effect of Core Offset on the Mode Converting Characteristics in Twisted Single Mode Fibers by Nakano, Sota, Fujisawa, Takeshi, Saitoh, Kunimasa

“…The effect of core offset on the mode converting characteristics in twisted single mode fiber (SMF) is investigated. If the core position of SMF is slightly…”
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Group delay spread analysis of strongly coupled 3-core fibers: an effect of bending and twisting by Fujisawa, Takeshi, Saitoh, Kunimasa

“…The effect of bending and twisting on the group delay spread (GDS) of strongly coupled 3-core fibers is investigated. For the random perturbation inducing…”
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A Novel Algorithm of Wavefront-Matching Method for Stable and Efficient Design of Si Waveguides by Sawada, Yusuke, Fujisawa, Takeshi, Sato, Takanori, Saitoh, Kunimasa

“…We propose a novel algorithm of a wavefront-matching (WFM) method for the design of silicon waveguides. A conventional WFM method may not provide a stable…”
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Development of the Wavefront Matching Method Based on the 3-D Finite-Element Method and Its Application to Si-wire Mode Converters by Sawada, Yusuke, Sato, Takanori, Fujisawa, Takeshi, Saitoh, Kunimasa

“…A fully three-dimensional wavefront matching method (WFM) based on a finite-element scheme for optical waveguide devices including waveguide discontinuities is…”
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Full-Vector Finite-Element Beam Propagation Method for Helicoidal Waveguides and Its Application to Twisted Photonic Crystal Fibers by Fujisawa, Takeshi, Sato, Takanori, Saitoh, Kunimasa

“…A full-vector beam propagation method based on a finite-element scheme for a helicoidal system is developed. The permittivity and permeability tensors of a…”
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Optimum index profile of few-mode coupled multicore fibers for reducing the group delay spread by Yoshida, Kazuki, Fujisawa, Takeshi, Sato, Takanori, Saitoh, Kunimasa

“…We numerically investigate the group delay spread (GDS) characteristics in few-mode coupled multicore fibers (FM-CMCFs) in weak random-bending conditions by…”
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Design of silica-PLC LP11 mode rotator based on adiabatic mode conversion by Sato, Takanori, Fujisawa, Takeshi, Wada, Masaki, Mori, Takayoshi, Sakamoto, Taiji, Imada, Ryota, Matsui, Takashi, Nakajima, Kazuhide, Saitoh, Kunimasa

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Wavefront Matching Method Based on Full-Vector Finite-Element Beam Propagation Method for Polarization Control Devices by Makino, Shuntaro, Fujisawa, Takeshi, Saitoh, Kunimasa

“…We developed a wavefront matching (WFM) method based on the full-vector finite-element beam propagation method (BPM). The WFM method is one of the optimization…”
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Quantum-Confined Stark Effect Analysis of GeSn/SiGeSn Quantum Wells for Mid-Infrared Si-Based Electroabsorption Devices Based on Many-Body Theory by Fujisawa, Takeshi, Saitoh, Kunimasa

“…Quantum-confined Stark effect (QCSE) of group IV Ge(Sn)/SiGe(Sn) quantum wells (QWs) on Si substrate is analyzed by microscopic many-body theory for…”
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Effect of Denosumab or Alendronic Acid on the Progression of Aortic Stenosis: A Double-Blind Randomized Controlled Trial by Pawade, Tania A., Doris, Mhairi K., Bing, Rong, White, Audrey C., Forsyth, Laura, Evans, Emily, Graham, Catriona, Williams, Michelle C., van Beek, Edwin J.R., Fletcher, Alison, Adamson, Philip D., Andrews, Jack P.M., Cartlidge, Timothy R.G., Jenkins, William S.A., Syed, Maaz, Fujisawa, Takeshi, Lucatelli, Christophe, Fraser, William, Ralston, Stuart H., Boon, Nicholas, Prendergast, Bernard, Newby, David E., Dweck, Marc R.

“…Valvular calcification is central to the pathogenesis and progression of aortic stenosis, with preclinical and observational studies suggesting that bone…”
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Design of small mode-dependent-loss scrambling-type mode (de)multiplexer based on PLC by Shirata, Motoki, Fujisawa, Takeshi, Sakamoto, Taiji, Matsui, Takashi, Nakajima, Kazuhide, Saitoh, Kunimasa

“…A general design rule of scrambling-type mode (de)multiplexers (mode scramblers) based on silica planar lightwave circuit (PLC) with small mode-dependent-loss…”
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Coiling Size Dependence of Group Delay Spread in Coupled Multicore Fibers Without Intentional Twisting by Saitoh, Kunimasa, Fujisawa, Takeshi, Sato, Takanori

“…Coiling size dependence of group delay spread (GDS) in coupled multicore fibers (MCFs) without intentional twisting is investigated by using a coupled-wave…”
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Material Gain Analysis of GeSn/SiGeSn Quantum Wells for Mid-Infrared Si-Based Light Sources Based on Many-Body Theory by Fujisawa, Takeshi, Saitoh, Kunimasa

“…Material gain of GeSn/SiGeSn quantum wells, which can be grown on Si substrate using a buffer layer, is analyzed based on microscopic many-body theory (MBT)…”
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Eight-Channel Reflection-type Transversal Filter for Compact and Easy-to-Fabricate InP-Based Optical Multiplexer by Ueda, Yuta, Fujisawa, Takeshi, Kohtoku, Masaki

“…We developed an eight-channel (8ch) reflection-type transversal filter (RTF) with a 9 × 9 multimode interference coupler on an InP wafer to prove channel…”
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Errata to "Full-Vector Finite-Element Beam Propagation Method for Helicoidal Waveguides and its Application to Twisted Photonic Crystal Fibers" [Jul 17 2894-2901] by Fujisawa, Takeshi, Sato, Takanori, Saitoh, Kunimasa

“…Presents corrections to the paper, “Full-vector finite-element beam propagation method for helicoidal waveguides and its application to twisted photonic…”
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