Details of a Researcher - Ishigure, Takaaki

Presentations -

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ポリマー光導波路による3次元光配線

石榑崇明

電子情報通信学会　2015ソサエティ大会 (東北大学，宮城) ,

2015.09

Oral presentation (invited, special), 電子情報通信学会

演算性能増大に対応するべく，スーパコンピュータ筐体内やデータセンタ内ネットワークには，光ネットワークの導入が進んでいる．今後は，演算性能に加えて，システムの消費電力の問題から，広帯域・高密度オンボード光インターコネクト技術に期待が寄せられている．
　そこで，我々は，オンボード光インターコネクトの実現に向けて，屈折率分布（GI）型マルチモードポリマー光導波路の導入を提案し，更に，従来のポリマー光導波路とは大きく異なる，新規作製法：（Mosquito法）を考案した．この，Mosquito法の大きな特徴の一つに，容易に3次元配線が実現できる点がある．本講演では，このMosquito法を紹介し，3次元配線など，可能になった技術について概説する．

インプリント法によるGI型コアマルチモードポリマー並列光導波路の作製と低損失化

大泉悠太郎，石榑崇明

電子情報通信学会　2015ソサエティ大会 (東北大学，宮城) ,

2015.09

Oral presentation (general), 電子情報通信学会

HPCの高速化及び低消費電力化へ向けて既存の電気配線に代わる光配線の導入が検討されており，伝送路に同一平面内交差構造を有するポリマー交差光導波路を用いたボード内光配線が注目されている．
　当研究室では，これまでにポリマー導波路を作製する方法として，インプリント法を採用し，強い光の閉じこめ効果を有する屈折率分布(GI)型コア交差光導波路の作製を試みてきた．しかし，このインプリント法では，加工の際に生じるコア-クラッド界面の荒れ等の影響により，直線状導波路であっても十分な低損失化は達成されていない．そこで本研究では，コア側面の界面荒れによる光損失に着目し，インプリント法による低損失導波路の実現を目的とした．

Mosquito法により作製するポリマー光導波路のコア形状真円化検討

Yuki Saito and Takaaki Ishigure

電子情報通信学会光エレクトロニクス(OPE)研究会 (釧路市，北海道) ,

2015.07

Oral presentation (general)

Using the Mosquito method, the fabrication condition is investigated for multimode optical waveguides with GI circular cores. When a viscous core monomer with a viscosity of 50,000 cPs and higher is dispensed into a cladding monomer layer through a straight needle, a dip is observed in the upper perimeter of the core. Such a core-shape deviation is a concern to degrade the optical properties such as the coupling loss between an optical fiber and the waveguide. In this report, curved needles are introduced in order to form a perfectly circular core, even when a high-viscosity core monomer is dispensed: the dip could be eliminated by varying the dispensing direction of the core monomer. In fact, we evaluate the dependence of the ratio of the vertical to horizontal axes observed in the elliptical cores on the curved angle of needles after experimentally fabricating the waveguides. It is confirmed that an almost circular core shape (without a dip) is formed when the curved angle is in a range of 15-20°. In addition, the optical properties of the waveguides with and without a dip are reported.

低損失有機-無機ハイブリッド樹脂を用いたシングルモードポリマー光導波路

Kazuki Yasuhara, Sho Yosdhida,and Takaaki Ishigure

電子情報通信学会光エレクトロニクス(OPE)研究会 (釧路市，北海道) ,

2015.07

Oral presentation (general)

To apply to silicon photonics chip packaging, we fabricate a very low-loss single-mode polymer optical waveguide at 1550-nm wavelength using an organic-inorganic hybrid materials. The propagation loss of the single-mode polymer optical waveguide fabricated using the Mosquito method is 0.49 dB/cm at 1550 nm, which is remarkably lower than the loss of polymer optical waveguides composed of conventional organic materials at the same wavelength. Furthermore, for chip-to-chip optical interconnections, the inter-channel crosstalk of a narrow pitch (50-μm pitch) single-mode optical waveguide is evaluated and the measured crosstalk is sufficiently low as -35.0 dB at 1550 nm.

マルチモードポリマー光導波路の並列コア間ピッチ変換

Hikaru Masuda, Kyuta Suzuki, Daisuke Suganuma, and Takaaki Ishigure

電子情報通信学会光エレクトロニクス(OPE)研究会 (釧路市，北海道) ,

2015.07

Oral presentation (general)

We fabricate a pitch conversion structure in multimode polymer optical waveguides for high density interconnects on printed circuit boards (PCBs). In order to connect with a multimode fiber (MMF) ribbon which has a 250-um pitch, we design the waveguide to have a 250-um pitch on one end, while a 125-um pitch on the other end. A 12-ch. multimode pitch-conversion polymer optical waveguides with 50-um diameter graded-index (GI) circular cores are experimentally fabricated using the Mosquito method. The Mosquito method has a potential for drawing a wide variety of wiring patterns. In the fabricated waveguide, excess loss is not necessarily observed due to the bending structure. Finally, we investigate how to improve the positional accuracy of cores. Then, it is confirmed when the waveguide is connected to a 12-ch. MMF ribbon with 250-um pitch, a good optical coupling is achieved for most of the cores.

Low-Loss Single-Mode Polymer Optical Waveguide at 1550-nm Wavelength Compatible with Silicon Photonics

ISHIGURE TAKAAKI

65th IEEE Electronic Components and Packaging Technology Conferenece (ECTC2015),

2015.05

Oral presentation (invited, special)

低損失・低クロストークFan-in/outポリマー光導波路

ISHIGURE TAKAAKI

第29回エレクトロニクス実装学会講演大会,

2015.03

Oral presentation (invited, special)

広帯域・高密度実装を可能にするGI型ポリマー光導波路

ISHIGURE TAKAAKI

第29回エレクトロニクス実装学会講演大会,

2015.03

Oral presentation (invited, special)

広帯域・高密度チップ間通信へ向けたポリマー光導波路

ISHIGURE TAKAAKI

電子情報通信学会2015総合大会 (滋賀県　立命館大学びわこ・くさつキャンパス) ,

2015.03

Public lecture, seminar, tutorial, course, or other speech

Bend insensitive graded index multimode polymer optical waveguides fabricated using the Mosquito method

TAKAHASHI ASAMI,ISHIGURE TAKAAKI

SPIE Photonics West 2015 OPTO (San Francisco, California, United States) ,

2015.02

Oral presentation (general)

Fan-in/out polymer optical waveguide for a multicore fiber fabricated using the Mosquito method

SUGANUMA DAISUKE,ISHIGURE TAKAAKI

SPIE Photonics WEST 2015 OPTO (San Francisco, California, United States) ,

2015.02

Oral presentation (general)

Polymer optical waveguide composed of europium-aluminum-acrylate composite core for compact optical amplifier and laser

MITANI MARINA,ISHIGURE TAKAAKI

SPIE Photonics West 2015 OPTO (San Francisco, California, United States) ,

2015.02

Oral presentation (general)

Multimode/single-mode polymer optical waveguide circuit for high-bandwidth-density on-board interconnects

ISHIGURE TAKAAKI

SPIE Photonics West 2015 OPTO,

2015.02

Oral presentation (invited, special)

Mosquito法による低曲げ損失多モードポリマー光導波路の作製

TAKAHASHI ASAMI,ISHIGURE TAKAAKI

電子情報通信学会光エレクトロニクス(OPE)研究会 (東京) ,

2014.11

Oral presentation (general)

Fabrication for Low-Loss Polymer Optical Waveguides with 90deg Bending Using the Mosquito Method

TAKAHASHI ASAMI,ISHIGURE TAKAAKI

IEEE CPMT Symposium Japan 2014 (Kyoto University ,Japan) ,

2014.11

Oral presentation (general)

GI型コアマルチモードポリマー交差光導波路

OOIZUMI YUUTAROU,ISHIGURE TAKAAKI

電子情報通信学会光エレクトロニクス(OPE)研究会 (長崎) ,

2014.10

Oral presentation (general)

Eu-Alポリマーコンポジット添加円形コアポリマー光導波路の作製と小型光増幅器への応用

MITANI MARINA,ISHIGURE TAKAAKI

電子情報通信学会光エレクトロニクス(OPE)研究会 (長崎) ,

2014.10

Oral presentation (general)

モスキート法によるポリマー光導波路の3次元高密度配線

SUZUKI KYUUTA,SUGANUMA DAISUKE,ISHIGURE TAKAAKI

エレクトロニクス実装学会ワークショップ (静岡県ラフォーレ修善寺) ,

2014.10

Poster presentation, エレクトロニクス実装学会

45-degree Mirrors on Graded-Index Core Polymer Optical Waveguides for Low-Loss Light Coupling

MORIMOTO YOSHIE,YOSHIDA SHOU

IEEE Photonics Conference(IPC) 2014 (アメリカ　サンディエゴ) ,

2014.10

Oral presentation (general)

GI-Core Polymer Optical Waveguide for Triggering the Migration of Optical Interconnects from Inter-Rack to PCBs

ISHIGURE TAKAAKI

European Conference on Optical Communications (ECOC 2014),

2014.09

Oral presentation (invited, special)

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