1992 Fiscal Year Final Research Report Summary
Research and development of fiber-amplifier-integrated optical isolator
| Project/Area Number |
02505003
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子機器工学
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| Research Institution | Tohoku University |
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Principal Investigator |
KAWAKAMI Shojiro Research Institute of Electrical Communication, Tokoku University, Professor, 電気通信研究所, 教授 (10006223)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Hiroyuki Telecommunication Division, Mitsubishi Cable Industries, Ltd., Senior Electrical, 電子通信研究部, 主席研究員
YOTSUYA Masami Telecommunication Division, Mitsubishi Cable Industries, Ltd., Manager, 電子通信研究部, 部長
HANAIZUMI Osamu Research Institute of Electrical Communication, Tohoku University, Research Asso, 電気通信研究所, 助手 (80183911)
SHIRAISHI Kazuo Faculty of Engineering, Utsunomiya University Associate Professor, 工学部, 助教授 (90134056)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Fiber Integration / Isolator / Polarization Splitter / LPS |
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| Research Abstract |
(1)Fiber-integrated optical isolator
We made an isolator chip composed of Faraday rotator, lambda/2 plate, and polarization splitter (rutile). Fiber-in-line structure was realized using TEC fiber, which was used for reducing the insertion loss. Isolation 45dB, insertion loss 3.5dB, and reflection attenuation 47dB were obtained. This technology leads to lens-free and alignment-free integration, so it is suitable for large-scale integration of optical devices.
We are trying to realize a high performance optical isolator by replacing the rutile with the laminated polarization splitter.
(2)Laminated polarization splitter (LPS)
We made the LPS composed of a-Si : H and SiO_2 films and obtained the branching angle 15.5ﾟ, which is nearly equal to the theoretical value. It was found that the high insertion loss was due to roughness of each film surface. We flattened the film surface by bias sputtering. LPS, fabricated by this method, has losses of 0.16dB and 0.17dB for ordinary and extraordinary beam, respectively.
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