| Project/Area Number |
08555089
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
情報通信工学
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| Research Institution | Utsunomiya University |
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Principal Investigator |
SHIRAISHI Kazuo Utsunomiya University, Faculty of Engineering, Professor, 工学部, 教授 (90134056)
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| Co-Investigator(Kenkyū-buntansha) |
OHISHI Isamu Furukawa Electric Co., Ltd, Senior Manager, 情報システム事業本部・マルチメディア推進室, 部長
MATSUMURA Kazuhito Utsunomiya University, Faculty of Eng., Professor, 工学部, 教授 (70005297)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥8,700,000 (Direct Cost: ¥8,700,000)
Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1996: ¥5,200,000 (Direct Cost: ¥5,200,000)
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| Keywords | Lensed fiber / GI fiber / Coreless fiber / Optical communication / Coupling / Working distance / Optical fiber / Laser diode / ファイバアレイ / コアレスファイバ |
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| Research Abstract |
Two kinds of new configurations of lensed fibers as the coupling between laser diodes and single-mode fibers have been proposed and their operations are experimentally confirmed. The reserch has succesfully finished. Main results obtained are as follows :
1.Long working distance and wide tolerances
We have proposed a lensed fiber that consists of a hemispherically-ended coreless-fiber and a quarter-pitch length of a graded-index fiber. Fabrication is quite simple and rapid. Basic characteristics of the new comfiguration, including long working distances (140mum) and wide lateral tolerances (+/- 1.2mum), are experimentally verified. The new configuration is suitable for integration-oriented coupling between arrayd laser diodes and an array of single-mode fibers.
2.A high coupling efficiency
A new configuration of lensed fiber that consists of cascaded two kinds of GI-fiber tips has been proposed. Basic characteristics, a low loss (2.0dB) and wide tolerance with a long working distance (50mum), have experimentally verified.
3.Other technical results
A new tool for cutting optical fibers with precision of 10 mum, a hemisherical-ending technique with a high precision by use of an arc-discharge, and a precise loss-estimation method based on the ray optics are newly developped in the research.
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