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| Presentation | 2017-08-31 15:30 Observation of eigen-mode propagation by selective mode excitation Yasuo Kokubun, Takuto Yamaguchi, Seiya Miura (Yokohama Nat'l Univ.)  OCS2017-24 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | LP mode is widely used to describe the light propagation in few mode fibers. Since an LP mode is a quasi-degenerate mode which is expressed by the linear combination of true eigen-modes (HE, EH, TE, and TM modes), however, the mode demultiplexing is difficult at the output end of few mode fibers and the MIMO-DSP is inevitable. To solve this problem, we proposed a novel mode division multiplexing using true eigen-modes. However, since the light propagation in an actual fiber is affected by some imperfections such as a bend, the elliptical deformation of core, twist, and so on, a discriminant analysis method of eigen-mode of actual few-mode fibers is required. Thus in this report, we observed the eigen-mode of actucal few-mode fibers from the near-field pattern at the output end of the fiber by varying the wavelength of light source. As the result, the true eigen-mode propagation was observed for step-index and graded-index single-core few-mode fibers while LP$_{11}$ modes were propagated as eigen-modes in 4LP-mode 12-core and 4LP-mode 19-core fibers. The elliptical deformation of these fibers was measured using an optical microscope, and the ellipticity were less than 4% for single-core, 12-core, and 19-core fibers. It can be concluded from these experimental results that the origin of the LP$_{11}$ mode propagation as the eigen-mode is not the elliptical deformation of core but other reasons such as the internal stress. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Mode division multiplexing / Few mode fiber / Eigen-mode / LP mode / Near-field pattern / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 117, no. 196, OCS2017-24, pp. 7-12, Aug. 2017. | |
| Paper # | OCS2017-24 | |
| Date of Issue | 2017-08-24 (OCS) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | OCS2017-24 |
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| Conference Information | |
| Committee | OFT OCS LSJ |
| Conference Date | 2017-08-31 - 2017-09-01 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hokkaido Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | OCS |
| Conference Code | 2017-08-OFT-OCS-LSJ |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Observation of eigen-mode propagation by selective mode excitation |
| Sub Title (in English) | |
| Keyword(1) | Mode division multiplexing |
| Keyword(2) | Few mode fiber |
| Keyword(3) | Eigen-mode |
| Keyword(4) | LP mode |
| Keyword(5) | Near-field pattern |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Yasuo Kokubun |
| 1st Author's Affiliation | Yokohama Natinal University (Yokohama Nat'l Univ.) |
| 2nd Author's Name | Takuto Yamaguchi |
| 2nd Author's Affiliation | Yokohama Natinal University (Yokohama Nat'l Univ.) |
| 3rd Author's Name | Seiya Miura |
| 3rd Author's Affiliation | Yokohama Natinal University (Yokohama Nat'l Univ.) |
| 4th Author's Name | |
| 4th Author's Affiliation | () |
| 5th Author's Name | |
| 5th Author's Affiliation | () |
| 6th Author's Name | |
| 6th Author's Affiliation | () |
| Speaker | Author-1 |
| Date Time | 2017-08-31 15:30:00 |
| Presentation Time | 25 minutes |
| Registration for | OCS |
| Paper # | OCS2017-24 |
| Volume (vol) | vol.117 |
| Number (no) | no.196 |
| Page | pp.7-12 |
| #Pages | 6 |
| Date of Issue | 2017-08-24 (OCS) |
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