論文 - 小池　康博

Pump-Polarization Effects in Dye-Doped Polymer Optical Fibers

Asuncion Illarramendi M., Zubia J., Bikandi I., Ayesta I., Parola I., Aramburu I., Arrue J., Tagaya A., Koike Y.

Journal of Lightwave Technology （Journal of Lightwave Technology）  36 （ 18 ） 4090 - 4098 2018年09月

ISSN  07338724

　概要を見る

© 1983-2012 IEEE. This paper presents a study on the influence of the polarization of the pump beam on the emission properties of dye-doped polymer optical fibers. The fiber samples, which are pumped transversely with linearly polarized light, are graded-index polymer optical fibers doped with rhodamine 6G. The variation of the intensity and angular distribution of the output emission are theoretically and experimentally analyzed as the polarization direction of the pump is changed. The analysis is carried out both in the regime of fluorescence and in the regime of amplified spontaneous emission. It is shown that a pump polarization perpendicular to the fiber symmetry axis yields not only higher emission efficiency but also narrower axial angular width. The effect of the polarization of the pump beam on the properties of the amplified spontaneous emission is also measured, including its threshold-like energy, relative efficiency, and optical gain. The results indicate that the pump polarization determines the light-emitting performance of dye-doped polymer optical fibers.

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Significantly robust data transmission by ballpoint-pen interconnect for graded-index plastic optical fiber

Kaseda Y., Inoue A., Koike Y.

Journal of Lightwave Technology （Journal of Lightwave Technology）  36 （ 18 ） 4167 - 4173 2018年09月

ISSN  07338724

　概要を見る

© 1983-2012 IEEE. We have developed a novel optical interconnect for graded-index plastic optical fibers based on the use of ballpoint-pen connectors, where ball lenses are precisely mounted on fiber end faces by a simple and low-cost ballpoint-pen production technology. This report demonstrates that the ballpoint-pen interconnect allows us for significantly robust data transmission with sufficient misalignment tolerance and mating durability for consumer applications, where very short optical fibers are frequently connected and disconnected to the consumer electronics in a manner similar to metal cables. In the ballpoint-pen interconnect, power penalties are barely affected even by misalignments with a lateral offset of 50 μm or a connector separation of 1.0 mm, allowing for optical fiber connections without the requirements of precise alignment or high manufacturing accuracy. Moreover, it is suggested that modal noises due to dusts and scratches on fiber end-faces are generated for conventional butt-coupling based on physical contact in applications that require frequent connection and disconnection of optical fibers. This modal noise generation can be prevented using nonphysical contacts with the ballpoint-pen connectors. We achieve high-speed data transmission that is barely influenced by 2500 mating cycles. These results suggest that the ballpoint-pen interconnect allows us for consumer-friendly optical fiber connections without the requirement of any cleanings in a manner similar to electrical interconnect.

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Depolarization effect of graded-index plastic optical fiber with strong mode mixing

Suzuki H., Inoue A., Koike Y.

Optics InfoBase Conference Papers （Optics InfoBase Conference Papers）  Part F98-BGPPM 2018 2018年

ISSN  9781557528209

　概要を見る

© 2018 The Author(s). We demonstrate that propagating light through graded-index plastic optical fibers is significantly depolarized by intrinsic mode mixing because of microscopic core heterogeneities. This depolarization effect allows for stable optical link through reduction of interference-induced noises.

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Significant reduction of nonlinear signal distortion by graded-index plastic optical fiber with intrinsic strong mode mixing

Muramoto K., Inoue A., Koike Y.

Optics InfoBase Conference Papers （Optics InfoBase Conference Papers）  Part F111-SOF 2018 2018年

ISSN  9781557528209

　概要を見る

© 2018 The Author(s). We demonstrate that novel graded-index plastic optical fibers significantly reduce nonlinear distortion of transmitted signals in optical links because of strong mode mixings caused by microscopic heterogeneities in polymers, enabling high-quality multilevel 4K/8K video transmission.

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Reflection noise characteristics in graded-index plastic optical fiber link based on ballpoint-pen interconnect

Yagi T., Inoue A., Koike Y.

Optics InfoBase Conference Papers （Optics InfoBase Conference Papers）  Part F98-BGPPM 2018 2018年

ISSN  9781557528209

　概要を見る

© 2018 The Author(s). We investigate the influence of reflection noises in graded-index plastic optical fiber link based on ballpoint-pen interconnect. The results suggest that the link quality tend to improve through reflection noises reduction despite system loss increase.

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Proposal of novel random polarization film with birefringent crystal for real-color displays

Udono M., Koike Y.

Proceedings of the International Display Workshops （Proceedings of the International Display Workshops）  2   467 - 469 2018年

ISSN  9781510883918

　概要を見る

© 2018 International Display Workshops. All rights reserved. We proposed the novel film, random depolarization film, which is the polymer film doped with the birefringent crystal particles. With using this film, we succeeded to solve the "blackout problem " of displays and to achieve much lower chromaticity change with polarized sunglasses.

Optical Characterization of Doped Thermoplastic and Thermosetting Polymer-Optical-Fibers

I. Ayesta, M. A. Illarramendi, J. Arrue, I. Parola, F. Jiménez, J. Zubia, A. Tagaya and Y. Koike

Polymers Vo. 9 （ No. 3 ） Article No. 90 2017年

研究論文（学術雑誌）, 共著, 査読有り

High-Speed Graded-Index Plastic Optical Fibers and their Simple Interconnects for 4K/8K Video Transmission

A. Inoue and Y. Koike

Journal of Lightwave Technology Vol. 34 （ No. 6 ） 1551 - 1555 2016年

研究論文（学術雑誌）, 共著, 査読有り

Temperature-independent zero-birefringence polymer for liquid crystal displays

M. Shikanai, A. Tagaya, and Y. Koike

Applied Physics Letters Vol. 108 （ Issue 13 ） 131902-1 - 131902-4 2016年

研究論文（学術雑誌）, 共著, 査読有り

Gas Separation Membranes Prepared with Copolymers of Perfluoro(2-Methylene-4,5-Dimethyl-1,3-Dioxlane) and Chlorotrifluoroethylene

M. Fang, Y. Okamoto, Y. Koike. Z. He, and T. C. Merkel

Journal of Fluorine Chemistry Vol. 188   18 - 22 2016年

研究論文（学術雑誌）, 共著, 査読有り

Characterization of the Optical Gain in Doped Polymer Optical Fibres

I. Parola, M. A. Illarramendi, J. Arrue, I. Ayesta, F. Jiménez, J. Zubia, A. Tagaya, and Y. Koike

Journal of Luminescence Vol. 177   1 - 8 2016年

研究論文（学術雑誌）, 共著, 査読有り

Dependence of Brillouin Frequency Shift on Water Absorption Ratio in Polymer Optical Fibers

K. Minakawa, K. Koike, N. Hayashi, Y. Koike, Y. Mizuno and K. Nakamura

J. Appl. Phys. Vol. 119   223102 2016年

研究論文（学術雑誌）, 共著, 査読有り

Misalignment Tolerance of Pluggable Ballpoint-Pen Interconnect of Graded-Index Plastic Optical Fiber for 4K/8K UHD Display

A. Inoue and Y. Koike

IEICE TRANS. Electron. Vol. E99-C （ No. 11 ） 1271 - 1276 2016年

研究論文（学術雑誌）, 共著, 査読有り

Structural Behavior Thin Glass Ionomer Laminates with Optimized Specific Strength and Stiffness

Y. Shitanoki, S. J. Bennison, and Y. Koike

Composite Structures Vol. 125   615 - 620 2015年

研究論文（学術雑誌）, 共著, 査読有り

Mechanisms of Orientational and Photoelastic Birefringence Generation of Methacrylates for the Design of Zero–Zero-Birefringence Polymers

H. Shafiee, S. Beppu, S. Iwasaki, A. Tagaya, and Y. Koike

Polymer Engineering & Science Vol. 55 （ Issue 6 ） 1330 - 1338 2015年

研究論文（学術雑誌）, 共著, 査読有り

Temperature Dependence of Brillouin Frequency Shift in Polymers Controlled by Plasticization Effect

K. Minakawa, K. Koike, Q. Du, N. Hayashi, Y. Koike, Y. Mizuno, and K. Nakamura

Journal of Applied Physics Vol. 117 （ Issue 14 ） 144505-1 - 144505-5 2015年

研究論文（学術雑誌）, 共著, 査読有り

Effects of Para-Fluorine Substituent of Polystyrene on Gradient-Index Fiber-Optic Properties

K. Koike, A. Suzuki, K. Makino, and Y. Koike

Optical Materials Vol. 39   143 - 147 2015年

研究論文（学術雑誌）, 共著, 査読有り

ボールペン技術による家庭用高精細映像光伝送システム開発　―　安価で簡易な光接続を可能とするボールペン型光インターコネクトの提案　―

当麻 哲哉、瀧塚 博志、鳥飼 俊敬、鈴木 等、小木 哲朗、小池 康博

Synthesiology（シンセシオロジー） Vol. 7 （ No. 2 ） 118 - 128 2014年11月

研究論文（学術雑誌）, 共著, 査読有り

Evaluation of Modal Noise in Graded-Index Silica and Plastic Optical fiber links for Radio-Over-Multimode Fiber Systems

M. Matsuura, R. Furukawa, Y. Matsumoto, A. Inoue, and Y. Koike

Optics Express Vol. 22 （ No.6 ） 6562 - 6568 2014年03月

研究論文（学術雑誌）, 共著, 査読有り

Light Scattering of Ideal Random Copolymers in Bulk

K. Koike, Q. Du, S. Nishino, and Y. Koike

Polymer Vol. 55 （ No. 3 ） 878 - 885 2014年02月

研究論文（学術雑誌）, 共著, 査読有り