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Paper Abstract and Keywords
Presentation 2025-10-23 16:55
Waveguide-based mode converter with a recursive structure for scalable expansion
Yohei Aikawa, Hiroyuki Uenohara (Science Tokyo) OCS2025-34 OPE2025-81 LQE2025-36
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes an optical mode converter that enables scalable support for an increasing number of modes. Among various types of mode converters, reconstitution-type devices are capable of dynamically switching between modes; however, they have faced the limitation of supporting only a small number of modes. To address this issue, we present a method that enables mode conversion for an arbitrary number of modes by recursively expanding the device structure. The proposed device consists of multi-mode interferometer couplers, -????/2 phase shifters, and Y-junction waveguides. By hierarchically
combining fundamental two-mode conversion units, the number of modes can be exponentially increased while maintaining structural simplicity. Numerical simulations using the two-dimensional finite element method were conducted to optimize each component of the device. We further evaluated the performance of a four-mode converter and confirmed that accurate conversion into different higher-order modes is achieved depending on the input port.
Keyword (in Japanese) (See Japanese page) 
(in English) Optical mode converter / Mode division multiplexing / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 211, OCS2025-34, pp. 44-49, Oct. 2025.
Paper # OCS2025-34 
Date of Issue 2025-10-16 (OCS, OPE, LQE) 
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)
Download PDF OCS2025-34 OPE2025-81 LQE2025-36

Conference Information
Committee OCS OPE LQE  
Conference Date 2025-10-23 - 2025-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
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Paper Information
Registration To OCS 
Conference Code 2025-10-OCS-OPE-LQE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Waveguide-based mode converter with a recursive structure for scalable expansion 
Sub Title (in English)  
Keyword(1) Optical mode converter  
Keyword(2) Mode division multiplexing  
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1st Author's Name Yohei Aikawa  
1st Author's Affiliation Institute of Science Tokyo (Science Tokyo)
2nd Author's Name Hiroyuki Uenohara  
2nd Author's Affiliation Institute of Science Tokyo (Science Tokyo)
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Speaker Author-1 
Date Time 2025-10-23 16:55:00 
Presentation Time 25 minutes 
Registration for OCS 
Paper # OCS2025-34, OPE2025-81, LQE2025-36 
Volume (vol) vol.125 
Number (no) no.211(OCS), no.212(OPE), no.213(LQE) 
Page pp.44-49 
#Pages 6 
Date of Issue 2025-10-16 (OCS, OPE, LQE) 

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