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Takaaki Ishigure - IEEE Xplore Author Profile
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Takaaki Ishigure

Also published under: T. Ishigure

Publications
164
Citations
1,309
Publications by Year
19932024
Co-Authors:
Show All Co-Authors (151)
Image of author Takaaki Ishigure

Takaaki Ishigure

Also published under: T. Ishigure

Affiliation

Faculty of Science and Technology
Keio University
Yokohama, Japan

Publication Topics

Biography

Takaaki Ishigure (Senior Member, IEEE) received the B.S. degree in applied chemistry and the M.S. and Ph.D. degrees in material science from Keio University, Yokohama, Japan, in 1991, 1993, and 1996, respectively. In 2005, he was with the Department of Electrical Engineering, Columbia University, New York, NY, USA, as a Visiting Research Scientist. He is currently a Professor with the Faculty of Science and Technology, Department of Applied-Physics and Physic-Informatics, Keio University. His current research interests are in on-board optical interconnections realized with multimode/single-mode polymer optical waveguides. He has authored or coauthored more than 60 original journal papers and 200 international conference papers including sev...
Publications
164
Citations
1,309
Publications by Year
19932024
Co-Authors:
Show All Co-Authors (151)
Author's Published Works

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Loss Reduction of Single-mode Y-branched Polymer Optical Waveguide for MUX/DEMUX Devices in Mode Division Multiplexing Links

Seiya Sakai;Takaaki Ishigure

2024 IEEE CPMT Symposium Japan (ICSJ)
Year: 2024 | Conference Paper |
Using the Mosquito method, we fabricate asymmetric single-mode Y-branched waveguides applicable to MUX/DEMUX devices for MDM technology. In order to reduce the insertion loss of Y-branched waveguides, we reexamine the fabrication conditions of symmetric single-mode Y-branched waveguides.Show More

Loss Reduction of Single-mode Y-branched Polymer Optical Waveguide for MUX/DEMUX Devices in Mode Division Multiplexing Links

Seiya Sakai;Takaaki Ishigure

Year: 2024 | Conference Paper |

3D Polymer Optical Waveguide-based Fan-in/out Device for Silicon Photonics Chips

Anzu Ito;Takaaki Ishigure

2024 IEEE CPMT Symposium Japan (ICSJ)
Year: 2024 | Conference Paper |
To realize a subminiature low-loss adiabatic coupler to silicon photonics chips, we design a PMT connector- integrated polymer waveguide device with circular single- mode cores to fabricate it using the Mosquito method.Show More

3D Polymer Optical Waveguide-based Fan-in/out Device for Silicon Photonics Chips

Anzu Ito;Takaaki Ishigure

Year: 2024 | Conference Paper |

Fixed Connection of Single-Mode Polymer Optical Waveguide with Single-Mode Optical Fiber

Shunsuke Toshida;Takaaki Ishigure

2024 IEEE CPMT Symposium Japan (ICSJ)
Year: 2024 | Conference Paper |
We demonstrate forming a waveguide module by adhering a core in a polymer waveguide and a single-mode fiber (SMF) to stabilize the connection at high temperature. We confirm that the connections are stably maintained at 86°C.Show More

Fixed Connection of Single-Mode Polymer Optical Waveguide with Single-Mode Optical Fiber

Shunsuke Toshida;Takaaki Ishigure

Year: 2024 | Conference Paper |

Evaluation and Analysis of Polarization Dependent Polymer Optical Waveguide Characteristics

Takumi Wakabayashi;Takaaki Ishigure

2024 IEEE CPMT Symposium Japan (ICSJ)
Year: 2024 | Conference Paper |
We design a measurement system to evaluate polarization dependent characteristics of polymer optical waveguides fabricated by the Mosquito method to be applied to a coupler between a single-mode fiber and silicon photonics chip. We observe the dependence of birefringence in single-mode polymer waveguides on their numerical aperture.Show More

Evaluation and Analysis of Polarization Dependent Polymer Optical Waveguide Characteristics

Takumi Wakabayashi;Takaaki Ishigure

Year: 2024 | Conference Paper |

Structural Investigation of Microchannel and Optical Waveguide Co-integrated Sensor Devices

Tomohiro Ichizuka;Takaaki Ishigure

2024 IEEE CPMT Symposium Japan (ICSJ)
Year: 2024 | Conference Paper |
In this paper, we design a device that integrates a microchannel and optical waveguide core, and fabricate it using the Mosquito method. Then, the light output is detected from the core after transmitting through the microchannel.Show More

Structural Investigation of Microchannel and Optical Waveguide Co-integrated Sensor Devices

Tomohiro Ichizuka;Takaaki Ishigure

Year: 2024 | Conference Paper |

Direct Connection of Multimode Polymer Waveguide and Multimode Fibers Using the Mosquito Method

Tatsuya Nakamura;Takaaki Ishigure

2024 IEEE CPMT Symposium Japan (ICSJ)
Year: 2024 | Conference Paper |
In this paper, we investigate the monomer dispensing conditions for the Mosquito method to accurately arrange the cores on the desired positions. Then, direct connection of waveguide core and multimode fiber is realized with the Mosquito method.Show More

Direct Connection of Multimode Polymer Waveguide and Multimode Fibers Using the Mosquito Method

Tatsuya Nakamura;Takaaki Ishigure

Year: 2024 | Conference Paper |

Structural Investigation of Rare-Earth Metal Polymer Composite Doped Optical Amplifiers for Higher Gain

Kohei Ono;Takaaki Ishigure

2023 IEEE CPMT Symposium Japan (ICSJ)
Year: 2023 | Conference Paper |
Embedded optical waveguides with a circular core doped with europium (Eu)-aluminum (Al) polymer composite are fabricated using the Mosquito method, and the relationship between the core diameter and amplification gain is investigated. Further increase in gain is expected by setting up the amplification measurement system appropriately for waveguides with large core diameters.Show More

Structural Investigation of Rare-Earth Metal Polymer Composite Doped Optical Amplifiers for Higher Gain

Kohei Ono;Takaaki Ishigure

Year: 2023 | Conference Paper |

Polymer Optical Waveguide Coupler with Vertically Bent Cores

Nagi Itaru;Naohiro Kohmu;Takaaki Ishigure

2023 IEEE CPMT Symposium Japan (ICSJ)
Year: 2023 | Conference Paper |
In this paper, polymer optical waveguides with 90-degree bent GI cores are fabricated using the Mosquito method. Material combinations that allow the formation of GI cores even with a diameter as large as $\mathbf{70}\ \boldsymbol{\mu} \boldsymbol{m}$ are screened. By further adjusting the interim time, the desired parabolic GI core can be fabricated to realize a low-loss coupling device.Show More

Polymer Optical Waveguide Coupler with Vertically Bent Cores

Nagi Itaru;Naohiro Kohmu;Takaaki Ishigure

Year: 2023 | Conference Paper |

Temperature Dependence of Coupling Loss from SMF to Polymer Optical Waveguides with Various Refractive Index Profiles

Ryota Kinoshita;Takaaki Ishigure

2023 IEEE CPMT Symposium Japan (ICSJ)
Year: 2023 | Conference Paper |
In this paper, we theoretically estimate the temperature dependence of coupling loss between single-mode (SM) polymer optical waveguides and general-purpose SM fiber (SMF), and discuss about the applicability of polymer optical waveguides to co-packaged optics (CPO). Although SM polymer optical waveguides are expected to be applied as an element of CPO, their small cores require precise mode-field...Show More

Temperature Dependence of Coupling Loss from SMF to Polymer Optical Waveguides with Various Refractive Index Profiles

Ryota Kinoshita;Takaaki Ishigure

Year: 2023 | Conference Paper |

Low Loss Design and Fabrication for Tapered Waveguide Based Spot Size Converter

Fumimasa Kondo;Yuii Furuta;Hisashi Kaneda;Tomoharu Fujii;Takaaki Ishigure

2023 IEEE CPMT Symposium Japan (ICSJ)
Year: 2023 | Conference Paper |
In this paper, propagating mode analysis is performed to optimize the core cross-sectional shape of polymer optical waveguide to be applied to a low loss adiabatic coupler to Si photonics chips when it is fabricated using the Mosquito method.Show More

Low Loss Design and Fabrication for Tapered Waveguide Based Spot Size Converter

Fumimasa Kondo;Yuii Furuta;Hisashi Kaneda;Tomoharu Fujii;Takaaki Ishigure

Year: 2023 | Conference Paper |

Polymer Optical Waveguide Type 3-D MUX Device for Mode Division Multiplexing Links

Ryoto Ichinose;Takumi Kowatari;Takaaki Ishigure

2023 IEEE CPMT Symposium Japan (ICSJ)
Year: 2023 | Conference Paper |
Using the Mosquito method, we fabricate waveguides with 3-dimensionally arranged cores to be applied to a MUX device for mode-division multiplexing technology. Applying the developed MUX, the different higher-order modes, LP11a and LP11b in one few-mode fiber core can be individually excited.Show More

Polymer Optical Waveguide Type 3-D MUX Device for Mode Division Multiplexing Links

Ryoto Ichinose;Takumi Kowatari;Takaaki Ishigure

Year: 2023 | Conference Paper |

Unique Optical Connect Structure with Polymer Waveguide Fabricated by the Mosquito Method

Yuji Furuta;Fumimasa Kondo;Anzu Ito;Ryoto Ichinose;Hisashi Kaneda;Tomoharu Fujii;Takaaki Ishigure

2023 IEEE CPMT Symposium Japan (ICSJ)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
We develop a unique optical connect structure with polymer waveguide fabricated by the Mosquito method for Co-Packaged Optics. We present the details of this optical connect structure and evaluation results of prototype waveguide.Show More

Unique Optical Connect Structure with Polymer Waveguide Fabricated by the Mosquito Method

Yuji Furuta;Fumimasa Kondo;Anzu Ito;Ryoto Ichinose;Hisashi Kaneda;Tomoharu Fujii;Takaaki Ishigure

Year: 2023 | Conference Paper |

Fabrication of Multimode Polymer Optical Waveguide Based Splitter by the Mosquito Method and Investigation of Its Signal Splitting Ratio

Kosei Azuma;Takaaki Ishigure

2023 IEEE CPMT Symposium Japan (ICSJ)
Year: 2023 | Conference Paper |
In this paper, multimode Y-branched waveguides with low insertion losses are designed and fabricated applying our original fabrication method of polymer optical waveguides named the Mosquito Method, and then, light splitting ratios of the fabricated Y-branched waveguides are investigated for application to DEMUX devices.Show More

Fabrication of Multimode Polymer Optical Waveguide Based Splitter by the Mosquito Method and Investigation of Its Signal Splitting Ratio

Kosei Azuma;Takaaki Ishigure

Year: 2023 | Conference Paper |

Polymer Optical Waveguide Type 3-D MUX device for Mode Division Multiplexing Links

Ryoto Ichinose;Takumi Kowatari;Takaaki Ishigure

2023 IEEE 73rd Electronic Components and Technology Conference (ECTC)
Year: 2023 | Conference Paper |
In this paper, we fabricate a polymer optical waveguide with 3-dimensional core arrangement applicable to a MUX device for mode-division multiplexing technology. We apply the Mosquito method that we developed as a fabrication technique to fabricate single-mode and multimode polymer optical waveguides with circular cores. Because of the unique fabrication procedures of the Mosquito method, 3-dimens...Show More

Polymer Optical Waveguide Type 3-D MUX device for Mode Division Multiplexing Links

Ryoto Ichinose;Takumi Kowatari;Takaaki Ishigure

Year: 2023 | Conference Paper |

Fabrication for low-loss polymer optical waveguide with vertically 90° bent core

Daiki Suemori;Maho Ishii;Naohiro Kohm;Takaaki Ishigure

2022 IEEE CPMT Symposium Japan (ICSJ)
Year: 2022 | Conference Paper |
In this paper, we directly fabricate vertically 90-degree bent core polymer optical waveguide right above a VCSEL chip to be applied to an optical coupler in subminiature on-board optical engine. We have proposed the Mosquito method for fabricating polymer optical waveguide utilizing a microdispenser. In the procedure of the Mosquito method, the vertically 90-degree bent cores are dispensed just a...Show More

Fabrication for low-loss polymer optical waveguide with vertically 90° bent core

Daiki Suemori;Maho Ishii;Naohiro Kohm;Takaaki Ishigure

Year: 2022 | Conference Paper |

Fabrication for Circular Cross-Sectional Microchannels and Their Application for On-off Valves

Kaori Uehara;Yukata Hori;Takaaki Ishigure

2022 IEEE CPMT Symposium Japan (ICSJ)
Year: 2022 | Conference Paper |
Polymer microchannels with circular cross-sections for on-off valves are designed and fabricated using the Mosquito method. By demonstrating liquid-flow and by applying load to the fabricated microchannels, we confirm that the microchannels appropriately close to stop flowing the liquid as an on-off valve.Show More

Fabrication for Circular Cross-Sectional Microchannels and Their Application for On-off Valves

Kaori Uehara;Yukata Hori;Takaaki Ishigure

Year: 2022 | Conference Paper |

Investigation of fabrication conditions for Y-branched polymer optical waveguides using the Mosquito method

Kentaro Sekitani;Ryosuke Hatai;Takaaki Ishigure

2022 IEEE CPMT Symposium Japan (ICSJ)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
In this paper, the conditions for fabricating Y-branched optical waveguides using the Mosquito method are discussed, focusing on the viscosity of the monomer and the branch angle. With increasing the viscosity of core monomer, the Y-branching structures tend to be distorted particularly when the branching angle is larger than 0.5 degree. After finding out the appropriate fabrication conditions, Y-...Show More

Investigation of fabrication conditions for Y-branched polymer optical waveguides using the Mosquito method

Kentaro Sekitani;Ryosuke Hatai;Takaaki Ishigure

Year: 2022 | Conference Paper |

Fabrication for Y-branched Polymer Optical Waveguide Using the Imprint Method and Its Application for Mode Division Multiplexing Devices

Shinnosuke Ono;Takaaki Ishigure

2022 IEEE CPMT Symposium Japan (ICSJ)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
We propose an asymmetric polymer Y-branched waveguide for a multiplexer of TE01 and TE11 modes to a few-mode fiber in mode division multiplexing links, in this paper. Fabricated waveguides have square cross-sectional graded-index (GI) cores which exhibit strong optical confinement to the core center. Theoretical loss calculation by BPM shows that the GI core exhibits higher mode splitting ratio an...Show More

Fabrication for Y-branched Polymer Optical Waveguide Using the Imprint Method and Its Application for Mode Division Multiplexing Devices

Shinnosuke Ono;Takaaki Ishigure

Year: 2022 | Conference Paper |

Design and Fabrication of Three-dimensional Polymer Optical Waveguide-based Fan-in/out Device for Multicore Fibers

Yuto Yamaguchi;Sho Yakabe;Takaaki Ishigure

2022 IEEE CPMT Symposium Japan (ICSJ)
Year: 2022 | Conference Paper |
Cited by: Papers (3)
Compact and low-loss fan-in/-out waveguides are successfully fabricated using the Mosquito method, in which four cores vary their arrangement three-dimensionally from one end to the other and they are precisely aligned to couple to multicore fibers.Show More

Design and Fabrication of Three-dimensional Polymer Optical Waveguide-based Fan-in/out Device for Multicore Fibers

Yuto Yamaguchi;Sho Yakabe;Takaaki Ishigure

Year: 2022 | Conference Paper |

Design and Fabrication of Three-dimensional Polymer Optical Waveguide-based Fan-in/out Device for Multicore Fibers

Yuto Yamaguchi;Sho Yakabe;Takaaki Ishigure

2022 European Conference on Optical Communication (ECOC)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
In this paper, a compact (10-mm long) and low-loss fan-in/-out polymer waveguide is successfully fabricated using the Mosquito method, in which four cores three-dimensionally vary their arrangemnent from one end to the other and they are precisely aligned to couple to a multicore fiber.Show More

Design and Fabrication of Three-dimensional Polymer Optical Waveguide-based Fan-in/out Device for Multicore Fibers

Yuto Yamaguchi;Sho Yakabe;Takaaki Ishigure

Year: 2022 | Conference Paper |

Error-Free Three-Dimensional Multimode Crossover Graded-Index Polymer Waveguides for Board-Level Optical Circuitry

Md Omar Faruk Rasel;Akira Yamauchi;Takaaki Ishigure

Journal of Lightwave Technology
Year: 2022 | Volume: 40, Issue: 19 | Journal Article |
Cited by: Papers (3)
In this paper, we experimentally introduce a low-loss 3-dimensional (3D) symmetric crossover multimode optical waveguides realized with parabolic graded-index (GI) profiles using the Mosquito method. This compact crossover multimode waveguide is comprised of two S-bend core groups (6 Ch. × 6 Ch.), where the last six cores cross over the first six cores, maintaining a height gap at the crossover se...Show More

Error-Free Three-Dimensional Multimode Crossover Graded-Index Polymer Waveguides for Board-Level Optical Circuitry

Md Omar Faruk Rasel;Akira Yamauchi;Takaaki Ishigure

Year: 2022 | Volume: 40, Issue: 19 | Journal Article |

90-degree bent core polymer optical waveguide coupler for low loss lens-less light coupling between laser / photodetector and fiber

Daiki Suemori;Maho Ishii;Naohiro Kohmu;Takaaki Ishigure

2022 IEEE 72nd Electronic Components and Technology Conference (ECTC)
Year: 2022 | Conference Paper |
In this paper, we present direct fabrication of vertically 90-degree bent core polymer optical waveguide couplers to be integrated in optical engines enabling lens-less light coupling between laser source / photodetector and fiber with low loss. We apply the Mosquito method that we developed as a fabrication technique for single-mode and multimode polymer optical waveguides with circular cores. Be...Show More

90-degree bent core polymer optical waveguide coupler for low loss lens-less light coupling between laser / photodetector and fiber

Daiki Suemori;Maho Ishii;Naohiro Kohmu;Takaaki Ishigure

Year: 2022 | Conference Paper |

GI-core Multimode and Single-mode Polymer Waveguides for High-density Co-packaging

Takaaki Ishigure

2022 Optical Fiber Communications Conference and Exhibition (OFC)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
We present unique polymer optical waveguide coupler devices fabricated using the Mosquito method to apply for adiabatic coupling with Si photonics chips, three-dimensional fan-in/fan-out devices for multicore fibers, and MUX devices for mode division multiplexing.Show More

GI-core Multimode and Single-mode Polymer Waveguides for High-density Co-packaging

Takaaki Ishigure

Year: 2022 | Conference Paper |

Fabrication of Y-Branched GI Core Polymer Waveguide and its Application to CWDM MUX Device for Multimode Fiber

Ryosuke Hatai;Fukino Nakazaki;Tomoki Nakayama;Takaaki Ishigure

Journal of Lightwave Technology
Year: 2022 | Volume: 40, Issue: 9 | Journal Article |
This paper describes the characteristics of graded-index (GI) core Y-branched polymer optical waveguides as optical couplers for multimode fibers (MMFs) in coarse wavelength division multiplexing links with a restricted mode launch function. In this paper, we compare two GI-core Y-branched waveguides fabricated using different methods: the Mosquito method and the imprint method. Error free transmi...Show More

Fabrication of Y-Branched GI Core Polymer Waveguide and its Application to CWDM MUX Device for Multimode Fiber

Ryosuke Hatai;Fukino Nakazaki;Tomoki Nakayama;Takaaki Ishigure

Year: 2022 | Volume: 40, Issue: 9 | Journal Article |

High-Density Electrical and Optical Assembly for Subminiature VCSEL-Based Optical Engine

Naohiro Kohmu;Maho Ishii;Takaaki Ishigure

IEEE Transactions on Components, Packaging and Manufacturing Technology
Year: 2022 | Volume: 12, Issue: 1 | Journal Article |
Cited by: Papers (7)
In this article, we propose a subminiature (10.9 mm $\times56.6$ mm) vertical cavity surface-emitting laser (VCSEL)-based optical engine with a low crosstalk penalty for onboard applications. When applying optical engines to onboard interconnects, ICs [laser drivers and transimpedance amplifiers (TIAs)] and active optical devices (light sources and photodetectors) must be mounted densely to make...Show More

High-Density Electrical and Optical Assembly for Subminiature VCSEL-Based Optical Engine

Naohiro Kohmu;Maho Ishii;Takaaki Ishigure

Year: 2022 | Volume: 12, Issue: 1 | Journal Article |

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