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Paper Abstract and Keywords
Presentation 2026-06-18 14:15
[Invited Talk (Young Researcher)] Proposal of Geometric Mode-Division Multiplexing for Super-resolution SDM-MIMO FSO Transmission
Akira Kawai, Shimpei Shimizu, Katsuaki Higashimori, Kohki Shibahara, Megumi Hoshi, Masanori Nakamura, Kazumitsu Sakamoto, Yosuke Fujino, Takayuki Kobayashi, Yutaka Miyamoto (NTT) OCS2026-11
Abstract (in Japanese) (See Japanese page) 
(in English) Mode Division Multiplexing (MDM) technology, which exploits the spatial degrees of freedom of light propagation, has been actively investigated in the field of high-capacity optical fiber transmission, and is also expected to enable high-capacity Free-Space Optical communication (FSO). However, in FSO, the maximum number of multiplexed modes has been constrained by beam divergence due to diffraction in free space. In this presentation, we propose a Geometric Mode Division Multiplexing (GMDM) scheme that applies synthetic aperture techniques from the sensing field, with the aim of increasing the number of multiplexed modes under diffraction—that is, achieving super-resolution—and we report the results of a proof-of-concept experiment.
Keyword (in Japanese) (See Japanese page) 
(in English) Free-space optics / MIMO / Mode-division multiplexing / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 76, OCS2026-11, pp. 9-13, June 2026.
Paper # OCS2026-11 
Date of Issue 2026-06-11 (OCS) 
ISSN 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)
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Conference Information
Committee OCS NS PN  
Conference Date 2026-06-18 - 2026-06-19 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OCS 
Conference Code 2026-06-OCS-NS-PN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Proposal of Geometric Mode-Division Multiplexing for Super-resolution SDM-MIMO FSO Transmission 
Sub Title (in English)  
Keyword(1) Free-space optics  
Keyword(2) MIMO  
Keyword(3) Mode-division multiplexing  
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1st Author's Name Akira Kawai  
1st Author's Affiliation NTT, Inc. (NTT)
2nd Author's Name Shimpei Shimizu  
2nd Author's Affiliation NTT, Inc. (NTT)
3rd Author's Name Katsuaki Higashimori  
3rd Author's Affiliation NTT, Inc. (NTT)
4th Author's Name Kohki Shibahara  
4th Author's Affiliation NTT, Inc. (NTT)
5th Author's Name Megumi Hoshi  
5th Author's Affiliation NTT, Inc. (NTT)
6th Author's Name Masanori Nakamura  
6th Author's Affiliation NTT, Inc. (NTT)
7th Author's Name Kazumitsu Sakamoto  
7th Author's Affiliation NTT, Inc. (NTT)
8th Author's Name Yosuke Fujino  
8th Author's Affiliation NTT, Inc. (NTT)
9th Author's Name Takayuki Kobayashi  
9th Author's Affiliation NTT, Inc. (NTT)
10th Author's Name Yutaka Miyamoto  
10th Author's Affiliation NTT, Inc. (NTT)
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Speaker Author-1 
Date Time 2026-06-18 14:15:00 
Presentation Time 25 minutes 
Registration for OCS 
Paper # OCS2026-11 
Volume (vol) vol.126 
Number (no) no.76 
Page pp.9-13 
#Pages 5 
Date of Issue 2026-06-11 (OCS) 

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