Papers - Koike, Yasuhiro

Highly Scattered Optical-Transmission Polymer and Its Application

KOIKE YASUHIRO, NIHEI EISUKE

Transactions of Material Research Society(MRS)Japan / IUMRS-ICAM-93, The 3rd IUMRS International Conference on Advanced Materials Vol. 15A   175-180 1993.09

Research paper (conference, symposium, etc.), Joint Work

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We propose a new concept, Highly Scattered Optical Transmission Polymer (HSOT Polymer) as a new light source medium in which the light is effectively scattered and illuminated from the surface during light transmission. Since the light scattering is caused inside the HSOT Polymer due to specific heterogeneous structure, surrounding device such as diffuser film asnd dot printing etc. which is indispensable in conventional ones are not necessary in our proposal. The intensity of illumination is about 50% stronger than that of conventional PMMA plate systems.

Low-Loss High-Bandwidth GI Polymer Optical Fiber

ISHIGURE TAKAAKI, HORIBE AKIHIRO, NIHEI EISUKE, KOIKE YASUHIRO

Transactions of Material Research Society(MRS)Japan / IUMRS-ICAM-93, The 3rd IUMRS International Conference on Advanced Materials Vol. 15A,   181-184 1993.09

Research paper (conference, symposium, etc.), Joint Work

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Low Loss, high bandwidth GI polymer optical fiber was successfully obtained by the interfacial-gel polymerization technique using PMMA and other dopant as the core material. The GI POF could cover whole bandwidth which is required for the B-ISDN and Optical Interconnection concept.

Polymer Optical Fiber Amplifier

TAGAYA AKIHIRO, KOIKEYSUHIRO, KINOSHITA TAKESI, NIHEI EISUKE, YAMAMOTO TSUYOSHI, SASAKI KEISUKE

Applied Physics Letters, Vol.63 ( No.7 ) 883-884 1993.08

Research paper (scientific journal), Joint Work, Accepted

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Polymer optical fiber amplifiers (POFA) of GI type, which have a gain in visible region, were successfully prepared by the interfacial-gel polymerization technique. The gain of 27 dB was observed at 591nm signal wavelength with 690W launched pomp power at 532 nm in a GI POFA with 0.5m length.

High-Bandwidth Organic Dye-Doped Polymar Optical Fiber Amplifier

YAMAMOTO TSUYOSHI, FUJII KAZUHITO, TERAMOTO SHIGEHIRO, TAGAYA AKIHIRO, NIHEI EISUKE, KINOSHITA TAKESHI, KOIKE YASUHIRO, SASAKI KEISUKE

Mulitigigabit Fiber Communcation Systems / SPIE-The international Society for Optical Engineering Proceedings (SPIE-The international Society for Optical Engineering)  Vol. 2024   42-51 1993.07

Research paper (conference, symposium, etc.), Joint Work

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organic dye (Rhodamine B) doped polymer optical fiber amplifier (POFA) of GI type was successfully prepared for the first time. The GI POFA of only 500nm in length gave 27dB in gain at 591nm of signal wavelength. Additionally, absorption cross section and emmision cross section of Rhodamine B in PMMA matrix were estimated, which were required to analyze amplification mechanism in the POFA.

High-Power Polymer Optical Fiber Amplifier and Their Applications

YAMAMOTO TSUYOSHI, FUJII KAZUHITO, TERAMOTO SHIGEHIRO, TAGAYA AKIHIRO, NIHEI EISUKE, KINOSHITA TAKESHI, KOIKE YASUHIRO, SASAKI KEISUKE

SPIE- The International Society for Optical Engineering, Doped Fiber Devices and Systems (SPIE- The International Society for Optical Engineering)  Vol. 2042   42-51 1993.07

Research paper (conference, symposium, etc.), Joint Work

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Amplification characteristics of GI type organic dye doped POFA are discussed. As an organic dye for optical amplification, Rhodamine 6G, Rhodamine B, Perylene Red are doped in the core region of POFs. These POFA can obtain optical gain in the visible region of wavelength from 570nm to 620nm. POFA is promising for extraordinary high power optical amplification in comparison with rare-earth ions doped silica fiber amplifier. For example, output power of 1kW with a gain of 30dB can be obtained by using a Rhodamine B doped POFA at a low dye concentration of 1ppm. Additionally, a novel solid-state POFA amplifier system is demonstrated.

有機色素ドープポリマー光ファイバー増幅器

山本剛、寺本茂弘、多加谷明弘、二瓶栄輔、木下岳司、小池康博、佐々木敬介、藤井和人

電子情報通信学会技術研究報告書／電子デバイス；光・量子エレクトロニクス (社団法人電子情報通信学会)  Vol. 93 ( No, 168, 169 ) 51-57 1993.07

Research paper (other academic), Joint Work

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Rhodamine B、Rhodamine 6G、Perylene Redを添加したポリマー光ファイバー増幅器をそれぞれ作製し、光増幅特性を実験的に確認し、報告している。信号光利得のファイバー長依存性について述べている。

High-Bandwidth Organic Dye-Doped Polymer Optical Fiber Amplifier

YAMAMOTO TSUYOSHI, FUJII KAZUHITO, TERAMOTO SHIGEHIRO, TAGAYA AKIHIRO, NIHEI EISUKE, KINOSHITA TAKESHI, KOIKE YASUHIRO, SASAKI KEISUKE

SPIE- The International Society for Optical Engineering, Multigigabit Fiber Communication Systems (SPIE- The International Society for Optical Engineering)  Vol. 2042   42-51 1993.07

Research paper (conference, symposium, etc.), Joint Work

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Organic dye (Rhodamine B) doped POFA of GI type was successfully prepared for the first time. The GI-POF of only 500mm in length gave 27dB in gain at 591nm of signal wavelength. Additionally, absorption cross section and emission cross section of Rhodamine B in PMMA matrix were estimated, which were required to analyze amplification mechanism in the POFA.

High-Speed Opticalfiber and Contactlens by GRIN Polymer Materials

KOIKE YASUHIRO, NISIZAWA YUKIE

Chemical Education (社団法人　日本化学会)  41 ( 11 ) 749-753 1993.01

Research paper (other academic), Joint Work

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光は、伝わる媒質が均一ならばまっすぐに進む。しかし、その道筋において媒質の形状や屈折率が変化すると、光は入射角に応じて反射や屈折率の現象を示してその進行方向を変える。私達のまわりでは、こういった光の現象を利用した、眼鏡やコンタクトレンズ、光ファイバー等の光学材料がいろいろ使われている。
従来の光学材料では、ほとんどのものが材料の形状を変化させることによって光線を制御しているが、近年、材料の形状に依存せず、材料中で光線を曲げることによってその進行方向を制御する材料が開発され、注目されている。
本稿ではその「光を曲げる材料」についてその作製方法および応用例について解説する。

GI型ポリマー光ファイバー

KOIKE YASUHIRO

Kao Chemical Forum  ( No.27 ) 15 1993

Research paper (other academic), Single Work

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GI POFにつき簡潔に解説。

有機色素ドープポリマー光ファイバー増幅器

藤井和人、山本剛、寺本茂弘、多加谷明弘、二瓶栄輔、木下岳司、小池康博、佐々木敬介

電子情報通信学会技術研究報告 (社団法人 電子情報通信学会)  Vol. 92 ( No. 322-325 ) 63-68 1992.11

Research paper (conference, symposium, etc.), Joint Work

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A Rhodamine B doped graded index polymer optical fiber was successfully prepared and the gain of 27dB was observed for the signal pules(591nm)by the excitation with SHG of Nd:YAG laser

Origin of Excess Light Scattering in Poly(Methyl Methacrylate) Glasses

KOIKE YASUHIRO, MATSUOKA SIROU, HARVEY E. BAIR

Macromolecules Vol.25 ( NO.18 ) 4807-4815 1992.09

Research paper (scientific journal), Joint Work, Accepted

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The Origin of the excess light scattering invariably observed in purified PMMA glasses was investigated. The isotropic heterogeneous structure with a dimension of about 1000Å, which increases the scattering loss by at least 1 order of magnitude (to several hundred dB/km) is generated during polymerization below Tg at high conversion and is not due to high molecular weight, specific tacticities, formation of cross-links, or aging. It is clearly shown that the remaining monomer in concentrations of several wt% does not aggregate spontaneously at high conversion to cause excess scattering unless polymerization takes place. The excess scattering is, we believe, mainly due to voids caused by the volume shrinkage accompanying polymerization of remaining monomer trapped inside the polymer glass. The excess scattering model proposed in this paper shows that if a slight amount of monomer in the PMMA glass is polymerized in situ at high conversion, generating slightly localized voids due to the aggregation of the unreacted initiator, a rise of only 1 wt% in the conversion increases the scattering loss by several hundred dB/km, which can reasonably explain the experimental result in this paper.

情報伝送量が従来の100倍以上のポリマー光ファイバー

KOIKE YASUHIRO

Chemistry and Chemical Industry (社団法人　日本化学会)  第45 ( 第7 ) 1261-1264 1992.07

Research paper (scientific journal), Single Work

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高速伝送POFについての最近の結果を中心に述べる。

Gradient-Index Optical Polymer Materials

KOIKE YASUHIRO, NIHEI EISUKE

繊維と工業/繊維学会誌 (The Society of Fiber Science and Technology, Japan)  第.48 ( .5 ) 248-252 1992.05

Research paper (scientific journal), Joint Work

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屈折率分布型光学機能材料の中でも、特に老視に用いることのできる２重焦点コンタクトレンズと、高帯域屈折率分布型光ファイバーのコネクタ部品として用いることが期待される低収差な屈折率分布型球レンズの作製方法、光学特性について解説している。（解説）

Gradient-Index Optical Polymer Materials

KOIKE YASUHIRO, NIHEI EISUKE

FGM　ニュース/傾斜機能材料研究会会報/ 傾斜機能材料研究会第14回ワークショップ (科学技術庁　傾斜機能材料研究会)   ( No. 16 ) 11-23 1992.04

Research paper (other academic), Joint Work

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A Gradient-indax (GRIN) materials display unique and useful optical properties which are not achieved by conventional optical devices with a constant refractive indax. In this paaer, GRIN polymer materials for bifocal GRIN contact lens and GRIN polymer Optical Fibers are described.
In the GRIN fiber, the bandwidth is about 1 GHz・km which is two hundred times larger than that of conventional step-index (SI) polymer optical fiber. The total attenuation of transmission is 90-100dB/km at 572-nm wavelength.
The contact lens was obtained by polishing the GRIN sontactlens exactly satisfied the bifocal condition.

Waveguide Devices from Nonlinear Organic Materials

SASAKI KEISUKE, NONAKA YASUSHI, NIHEI EISUKE, KOIKE YASUHIRO

Molecular Crystal and Liquid Crystals (MCLC) Science Technology -Section B: Nonlinear Optics Vol.3,   61-68 1992.03

Research paper (other academic), Joint Work

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Organic materials have bees applied to second and third order nonlinear optical thin film wave guide devices. In second-order devices, the basic material was a side-chained disperse red 1 (DR1)-MMA co-polymer system which was used for frequency doubling in the shorter wavelength region. The co-polymer was spin-coated on a Pyrex substrate and poled under a high DC-electric field over the glass transition temperature. Phase matching at double wavelengths, 532 and 406nm were realized by Cherenkov type in-phasing between fundamental and doubled waves avoiding strong absorption. In the third-order device, the basic was vacuum evavporated PDA film which was applied to all optical bistable waveguide devices together with a DFB structure.

Graded-Index and Single-Mode Polymer Optical Fibers

KOIKE YASUHIRO

Material Research Society(MRS) Symposium Proceedings (Material Research Society(MRS))  Vol. 247   817-828 1992

Research paper (conference, symposium, etc.), Single Work, Accepted

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High-Bandwidth GI POF and single-mode POF with good mechanical properties were successfully obtained by our interfacial gel polymerization technique. The bandwidth of the GI POF is about 1GHz・km which is two hundred times larger than that of the conventional SI POF. The minimum attenuation of transmission is 56dB/km at 688nm wavelength and 94 dB/km at 780nm wavelength. The single-mode POF in which the core diameter was 3-15µm and the attenuation of transmission was 200dB/km at 652nm wavelength was successfully obtained for the first time.

Second-Harmonic Generation by Cherenkov-Type Phase Matching in A Poled Polymer Waveguide

SUGIHARA OKIHIRO, KUNIOKA S, NONAKA YASUSHI, AIZIAWA RIKA, KOIKE YASUHIRO, KINOSITA TAKESI, SASAKI KEISUKE

Journal of Applied Physics Vol. 70 ( No.12 ) 7249-7252 1991.12

Research paper (scientific journal), Joint Work, Accepted

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A copolymer of MMA and azo-dye-substituted methacrylate is corona-poled. Cerenkov-type second harmonic generation (SHG) of Nd:YAG laser is observed in the poled polymer waveguide even though there is strong absorption of the SHG wavelength. The total SHG conversion efficiency is 1.72×10-3 %, and the next SHG conversion efficiency in the waveguide is 0.12%.

単分散、低収差ＧＲＩＮ球レンズ

KOIKE YASUHIRO

Koubunshi, High Polymers Japan (The Society of Polymer Science, Japan)  40 ( 10月 ) 690 1991.10

Research paper (scientific journal), Single Work

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新たに提案した懸濁重合を用いることにより,非常に単分散で特性のそろった屈折率分布型球レンズを作製する方法を示した。

Grade-Index Polymer Optical Fiber by New Random Copolymerization Technique

KOIKE YASUHIRO, HONDOU YUKIE, NIHEI EISUKE

Proceedings of SPIE's International Symposium on Plastic Optical Fiber (SPIE (The Internatinal Society for Optical Engineering))  Vol. 1592   62-72 1991.09

Research paper (conference, symposium, etc.), Joint Work

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A high-bandwidth Graded-Index (GI) polymer optical fiber (POF) was successfully obtained by our new random interfacial-gel copolymerization technique. The bandwidth of the GI POF is about 1GHz.km which is two hundred times higher than that of the conventional Step-Index (SI) POF. The total attenuation of the light transmission through these GI POFs is 150-200db/km at 625nm wavelength and the tensile strength is 1600 kg/cm2

High-Bandwidth Grade-Index Polymer Optical Fibre

KOIKE YASUHIRO

Polymer Vol.32 ( No.10 ) 1737-1745 1991.06

Research paper (scientific journal), Single Work, Accepted

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A low-loss and high-bandwidth GI POF in which the attenuation of transmission was less than 150dB/km at 650nm wavelength and the bandwidth was several hundreds MHz km has been successfully obtained by a copolymerization process utilizing the difference of the monomer reactivities. The control of the refractive index profile and the light scattering of such GI materials are the theoretically and experimentally investigated.