Presentations -

高速ポリマー光ファイバーとその展望

KOIKE YASUHIRO

[Domestic presentation]  国家プロジェクト「住宅分野の情報システム共通基盤整備推進事業」成果発表会 (東京) , 

2000.04

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Oral presentation (invited, special), 社団法人　日本電子機械工業会

フォトニクス材料の最先端

KOIKE YASUHIRO, ISHIGURE TAKAAKI

[Domestic presentation]  高分子学会「2000-1 ポリマーフロティア21」 高分子科学と物理学とのキャッチボールーエレクトロニクスマルチメディアを支える高分子ー (Tokyo) , 

2000.04

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Oral presentation (invited, special), The Society of Polymer Science, Japan

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高速通信メディアとしてのGI型POFを中心とする高速通信用POFについて紹介する

Recent Status of High-Speed Polymer Optical Fiber and Its Future Prospect

ISHIGURE TAKAAKI, KOIKE YASUHIRO

[Domestic presentation]  Laser and Quantum Electronics (日本) , 

2000.02

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Oral presentation (invited, special), The Institute of electronics, Information and Communication Engineers

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A lot of research interests are focused on the introduction of optical fiber even in the access network because of the growing demand for accessing Internet with high bit rate. Since inexpensive total system cost is strong]y required for LAN or access network, we have proposed a large-core, low-loss and high-bandwidth graded-index polymer optical fiber (GI POF) as a promising candidate of physical media. In this paper, we describe the recent development of the GI POF in its attenuation and bandwidth achieved by investigating a new polymer material and by theoretical analysis.

High-Performance Polymer Optical Fiber Lasers and Amplifiers

KURIKI KEN, KOBAYASHI TAKEYUKI, TAMURA TOSHIHIKO, TAGYA AKIHIRO, KOIKE YASUHIRO, OKAMOTO YOSHIYUKI

[International presentation]  Photonics West, Optelectronics 2000, Technical Conference on Organic Photonics Materials and Devices II (Ssn Jose, USA) , 

2000.01

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Oral presentation (invited, special), The International Society for Optical engineering (SPIE)

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We report on the lasing action of the GI POF containing dyes, such as Rhodamine B, Rhodamine 6G, Perylene Orange, and Pyrromethene 567. These dyes have been incorporate into poly (methyl methacrylate-co-2-hydroxyethyl methacrylate). These fibers were transversely pumped at 532 nm with a frequency-doubled Q-switching ND: YAG laser. Slope efficiency of 24% and output of 1,3 mJ were obtained with a Rhodamine 6G-doped fiber. A Lifetime of 200,000 pluses at 10 Hz was achieved with a Rhodamine B-doped fiber.
GI POF containing a Nd-chelate have also been fabricated. The absorption spectrum of the fiber exhibited several strong bands in the visible and infrared region. We have observed infrared fluorescence (0.90, 1.60, and 1.3µm) of the Nd3+ ion of the fiber at room temperature when it was pumped with an Ar+ -pumped dye laser at 580 nm. The Judd-Often theory was applied to the absorption spectrum of Nd+ in polymer to determine the Judd-Ofelt parameters. From the theory, various radiative properties, such as transition probability, branching ratio, and emission cross section for various emission levels, have been determined and reported.

Rare Earth-Doped Graded Index Polymer Optical Fibers for Optical Amplification

TAKEYUKI KOBAYASHI, KURIKI KEN, NISHIHARA SUSUMU, KOIKE YASUHIRO, OKAMOTO YOSHIYUKI

[International presentation]  Photonics West, Technical Conference, Rare-Earth-Doped Materials and Devices IV (California, USA) , 

2000.01

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Oral presentation (invited, special), The International Society for Optical Engimeering (SPIE)

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We encapsulated rare earth ions such as europium and neodymium with organic ligands to in corporate them into polymer materials. Their spectroscopic properties in polymer hosts and organic solutions were studied. Infrared emission has been observed from a neodymium-doped perdeuterated core GI POF.

High-Bandwidth, Low-Loss Graded-Index Polymer Optical Fiber with Long term Reliability

ISHIGURE TAKAAKI, SATO MASATAKA, KOIKE YAUSHIRO

[International presentation]  Workshop on Polymeric Materials for Microelectrics & Photonics Applications: Mechanics, Physics, Reliability, Processing, (POLY’99) (Paris, France) , 

1999.12

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Oral presentation (invited, special), American Society of Mechanical Engineers (ASME International), The IEEE Components, Packing & Manufacturing Technology Society (IEEEE-CPMT)

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ＧＩ型ＰＯＦ中に加えるドーパントの種類の最適化、及びファイバ延伸時の張力の最適化により70℃〜85℃の高温雰囲気下において伝送帯域特性、伝送損失特性がともに維持されるＧＩ型ＰＯＦの作成が可能になったことを詳細に報告した招待講演。

プラスチック光ファイバーでインターネットを家庭へ

KOIKE YASUHIRO

[Domestic presentation]  第14回「大学と科学」公開シンポジウム 「21世紀の新素材」－産業を活性化させる傾斜機能材料－ (Tokyo) , 

1999.12

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Oral presentation (invited, special), 第14回「大学と科学」公開シンポジウム組織委員会

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高分子であるプラスチック光ファイバー（POF）に傾斜機能を応用すると伝送速度が格段に速くなり光通信が家庭まで行き渡る。

High-Speed Plastic Optical Fibers and Amplifiers

KOIKE YASUHIRO

[International presentation]  International Symposium on Photonics and Applications (ISPA’99), Conference on Design,Fabrication,and Characterization of Photonic Devices (Singapore) , 

1999.12

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Oral presentation (invited, special), The International Society for Optical Engineering (SPIE)

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Recent status of the polymer optical fiber (POF) for high speed data communication and telecommunication is reviewed. The GI POF was proposed for the first time at Keio University, and several methodologies to fabricate GI POF have been currently proposed. In this paper, we clarify the great advantage of perfluorinated (PF) polymer as the polymer matrix of low-loss and high bandwidth GI POF. It is generally known that the PF polymer can decrease the intrinsic absorption loss compared with PMMA, which is the conventional material of POF. Furthermore, it was found that low material dispersion of the PF polymer is another advantage to obtain the high bandwidth GI POF.
It was clarified for the first time that the power distribution of modes formed by the mode dependence attenuation was the dominant factors of the higher bandwidth of the GI POF than theoretically predicted bandwidth, while the effect of the mode coupling was small.

Highly Scattering Optical Transmission Polymers for Liquid Crystal Display

TAGAYA AKIHIRO, KOIKE YASUHIRO

[International presentation]  International Symposium on Photonics and Applications (ISPA’99), Conference on Design,Fabrication,and Characterization of Photonic Devices (Singapole) , 

1999.12

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Oral presentation (invited, special), The International Society for Optical Engineering, (SPIE)

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We proposed highly scattering optical transmission (HSOT) polymers and applied it to a light pipe of a backlighting system for liquid crystal displays (LCDs). The HSOT polymer backlighting system having not only approximately twice the brightness but also twice the efficiency of the conventional one was realized based on analysis of multiple scattering in the HSOT polymers. The problem of color dispersion which had been believed to be the nature of scattering phenomenon was solved by optimizing the heterogeneous structures in the HSOT polymers. As a result, the HSOT polymer backlighting system with sufficient color uniformity was achieved. In addition, the HSOT polymer backlighting system is suitable for recent thin LCDs because of these advantages.

ＰＯＦの動向

KOIKE YASUHIRO

[Domestic presentation]  ＮＴＴ－ＡＴ第４回エイトラムダフォーラム'99 (Tokyo) , 

1999.11

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Oral presentation (invited, special)

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ＧＩ型ＰＯの現状とその最新動向について述べる。

Plastic Optical Fiber

KOIKE YASUHIRO

[International presentation]  The 8th Asian Chemical Congress and Chemical Industry & Instrument Exhibition. (8ACC '99) (Taipei, Taiwan) , 

1999.11

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Oral presentation (invited, special)

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今後、マルチメディア社会の鍵となる技術としてはデジタル信号へのコンバージョン技術、高速情報通信、高品質ディスプレイがあげられる。そこでこの要求をみたすと考えられるデバイスの中で、高速通信を可能とすることが期待されるＰＯＦにつき、解説した。

Research Strategy in Photonics Polymer

KOIKE YASUHIRO

[International presentation]  7th SPSJ International PolymerConference (IPC 99) (Yokohama,Japan) , 

1999.10

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Oral presentation (invited, special), The Society of polymer Science, Japan

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今後、マルチメディア社会の鍵となる技術としてはデジタル信号へのコンバージョン技術、高速情報通信、高品質ディスプレイがあげられる。そこでこの要求を満たすと考えられるデバイス、高速通信が可能である、POFおよび光散乱ポリマー導光体バックライトにつき、その基礎開発から応用まで解説した。

Development of High-Speed, Low-Loss Polymer Optical Fiber and Optical Network

KOIKE YASUHIRO

[International presentation]  Chitose International Forum on Photonic Scienses (Chitose, Japan) , 

1999.10

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Oral presentation (invited, special)

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広伝送帯域、低損失なシングルモードガラス光ファイバーに相当する屈折率分布型ポリマー光ファイバーの光学特性について解説した。

POF for High-Speed Telecommunication

KOIKE YASUHIRO

[International presentation]  International Conference on Advanced Fiber Materials (Ueda, Japan) , 

1999.10

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Oral presentation (invited, special), The Society of Fiber Science and Technology, Japan, The Textile Mechinery Society of Japan, The Japan Research Association for Textile End-Use

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GI型POFの損失特性、帯域特性に関する現状を報告した。

Status of GIPOF System and Related Technologies

G.D. KHOE, KOIKE YASUHIRO, ISHIGURE TAKAAKI, P.K. BENNEKOM, H.P.A.V.D. BOOM, W. LI, G. YABRE

[International presentation]  25th European Conference on Optical Communication (ECOC '99) (Nice France) , 

1999.09

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Oral presentation (invited, special)

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全フッ素化ポリマー系ＧＩ型ＰＯＦに波長 650nm、850nm、1300nm の４種類の波長それぞれ 2.5Gbps の信号を乗せて伝送することにより、7.5Gbps、200m の伝送に成功したことを報告した。

Highly Scattering Optical Transmission Polymer for Bright Display

TAGAYA AKIHIRO, KOIKE YASUHIRO

[International presentation]  218th American Chemical Society National Meeting, (1999 Fall ACS Meeting), International Symposium on Polymers in Display Applications (New Orleans, USA) , 

1999.08

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Oral presentation (invited, special), ACS

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We proposed a highly scattering optical transition (HSOT) polymer and applied it to a light pipe of a backlight system for LCD. Although the HSOT polymer backlight system was composed of fewer parts than those of the conventional one. In addition, the HSOT polymer backlight system had no degradation of color uniformity due to scattering in the HSOT polymer.

Recent Status of Polymer Optical Fiber for High-Speed Date Communication

KOIKE YASUHIRO, ISHIGURE TAKAAKI

[International presentation]  SPIE Annual Meeting 1999, Conference on Organic Materials for Photonics Linear Optical Properties of Waveguides and fibers (Bellingham, USA) , 

1999.07

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Oral presentation (invited, special), SPIE

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Recent status of the polymer optical fiber (POF) for high speed communication and telecommunication is reviewed. The GI POF was proposed for the first time at Keio University, and several methodologies to fabricate GI POF have been currently proposed. In this paper, we clarify the great advantage of perfluorinated (PF) polymer which can decrease the intrinsic absorption loss compared with poly methyl methacrylate (PMMA), which is the conventional material of POF. Furthermore, it was found that low material dispersion of the PF polymer is another advantage to obtain the high bandwidth GI POF. It was clarified for the first time that the power distribution of modes formed by the mode dependent attenuation was the dominant factor of the higher bandwidth of the GI POF than theoretically predicted bandwidth, while the effect of the mode coupling was small.

伝送技術－プラスチック光ファイバーの展望

KOIKE YASUHIRO

[Domestic presentation]  有機エレクトロニクス材料研究会第104回研究会 (長野) , 

1999.06

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Oral presentation (invited, special), 有機エレクトロニクス材料研究会 新世代技術研究会 機能性高分子材料研究会 財団法人　浅間テクノポリス開発機構

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アクセス系やLAN等システムの低価格性が期待されるネットワークにおいて実用化が期待される大口径、低損失、GI型POFに関して近年得られてきた材料検討による実験的なアプローチ、および理論的な解析を通した低損失化・広帯域か技術について述べる。

photonics Polymer for Multimedia

KOIKE YASUHIRO, TAGAYA AKIHIRO, ISHIGURE TAKAAKI

[Domestic presentation]  プラスチック成形加工学会第10回プラスチック成形加工学会年次大会 (Tokyo) , 

1999.06

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Oral presentation (invited, special), プラスチック成形加工学会

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マルチメディアのためのフォトニクスポリマーとして伝送技術分野における、GI型POFの現状と、今後の展望、表示技術における光散乱ポリマー導光体バックライトシステムについて紹介する。

Novel Photonics Polymers in High-Speed Telecommunication

KOIKE YASUKIRO

[International presentation]  5th International Conference on Frontiers of Polymers and Advanced Materials,Conference&Exhibit. (Pozan,Poland) , 

1999.06

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Oral presentation (invited, special)

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高速通信のためのプラスチック光ファイバーおよび、高輝度散乱媒体のためのHSOTポリマーの最新状況につき報告した。