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Paper Abstract and Keywords
Presentation 2026-02-19 14:30
Proof-of-Principle of Scalable High-Power Coherent Beam Combining via Hybrid Modulation for Optical Wireles Power Transmission
Tomohiro Akiyama, Eisuke Haraguchi, Takahiro Suzuki, Rio Narazaki (Mitsubishi Electric Corp.) SANE2025-104
Abstract (in Japanese) (See Japanese page) 
(in English) Enhancing the power transfer capability of free-space optical power transmission requires the realization of high-power laser beams. However, power scaling using fiber amplification is limited by nonlinear effects such as stimulated Brillouin scattering (SBS). To overcome these limitations and achieve higher optical output, we have been developing a coherent beam combining (CBC) technique that spatially combines multiple laser beams. To mitigate SBS-induced constraints in CBC systems, we propose a “hybrid modulation” approach that combines (i) high-speed phase modulation of the laser light using a pseudo-random binary sequence (PRBS) to broaden the optical spectrum and increase the SBS threshold, and (ii) multi-dither phase synchronization, in which small, distinct frequency dithers are applied to each beam, allowing phase separation and detection using a single photodetector. This paper presents experimental results of the proposed method. PRBS phase modulation (up to 28.2 Gbps, PN7) effectively broadened the optical spectrum, and the SBS threshold increased with the bit rate (e.g., for 10 Gbps, the onset of backscattering was observed around an input power of +20 dBm). Furthermore, for hybrid-modulated light simulating multiple dither frequencies, phase noise suppression was demonstrated by extracting target beat components through bandpass filtering and applying phase synchronization control. These results confirm that the proposed approach can relax the SBS limitation and enable scalable coherent beam combining.
Keyword (in Japanese) (See Japanese page) 
(in English) Coherent Beam Combining / Optical Phased Array / Optical Phase Locking / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 358, SANE2025-104, pp. 30-35, Feb. 2026.
Paper # SANE2025-104 
Date of Issue 2026-02-12 (SANE) 
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 SAT SANE  
Conference Date 2026-02-19 - 2026-02-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Eef-Jouhou-Plaza 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Application and General Issues 
Paper Information
Registration To SANE 
Conference Code 2026-02-SAT-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Proof-of-Principle of Scalable High-Power Coherent Beam Combining via Hybrid Modulation for Optical Wireles Power Transmission 
Sub Title (in English)  
Keyword(1) Coherent Beam Combining  
Keyword(2) Optical Phased Array  
Keyword(3) Optical Phase Locking  
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1st Author's Name Tomohiro Akiyama  
1st Author's Affiliation Mitsubishe Electric Corporation (Mitsubishi Electric Corp.)
2nd Author's Name Eisuke Haraguchi  
2nd Author's Affiliation Mitsubishe Electric Corporation (Mitsubishi Electric Corp.)
3rd Author's Name Takahiro Suzuki  
3rd Author's Affiliation Mitsubishe Electric Corporation (Mitsubishi Electric Corp.)
4th Author's Name Rio Narazaki  
4th Author's Affiliation Mitsubishe Electric Corporation (Mitsubishi Electric Corp.)
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Speaker Author-1 
Date Time 2026-02-19 14:30:00 
Presentation Time 20 minutes 
Registration for SANE 
Paper # SANE2025-104 
Volume (vol) vol.125 
Number (no) no.358 
Page pp.30-35 
#Pages 6 
Date of Issue 2026-02-12 (SANE) 

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