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Paper Abstract and Keywords
Presentation 2025-10-24 13:30
[Invited Lecture] Color Shift Keying Using Multiple Wavelengths for Shallow-Water Simultaneous Lightwave Information and Power Transfer
Yusuke Kozawa (Ibaraki Univ.) RCS2025-141
Abstract (in Japanese) (See Japanese page) 
(in English) In recent years, the underwater simultaneous lightwave information and power transfer (USLIPT) system has gained attention as a promising technology for underwater sensors and drones. In clear water, USLIPT using blue or green laser diodes (LDs) is often studied due to their low attenuation. However, the optimal wavelength can vary with the spectral sensitivity of the solar panel and the wavelength dependence of solar noise. This study focuses on shallow water, where solar noise is dominant, and investigates the effectiveness of single- and multi-wavelength transmission. For multi-wavelength transmission, color shift keying (CSK) is employed, with propagation characteristics derived from Monte Carlo photon simulations, and the communication-to-power transfer ratio optimized via power splitting. Results show that at a depth of 20m, transmission distance of 10m, chlorophyll concentration of $2.0 mathrm{mg/m^3}$, and at 13:00 when solar noise is strongest, CSK with RGB-LDs reduces the required signal-to-noise ratio (SNR) by about 2dB compared with red-green LDs to achieve a bit error rate of $10^{-3}$, thereby increasing harvested power. In contrast, single-color pulse amplitude modulation fails to meet communication constraints under solar noise, causing interruptions in power transfer.
Keyword (in Japanese) (See Japanese page) 
(in English) Underwater optical wireless communication / Underwater simultaneous lightwave information and power transfer / Color shift keying / Solar noise / Power splitting / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 214, RCS2025-141, pp. 92-92, Oct. 2025.
Paper # RCS2025-141 
Date of Issue 2025-10-16 (RCS) 
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 RCS2025-141

Conference Information
Committee RCS  
Conference Date 2025-10-23 - 2025-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Ito-shi-Kanko-Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Communication Schemes, Wireless Communication Systems, Wireless Standards, Future Wireless Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2025-10-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Color Shift Keying Using Multiple Wavelengths for Shallow-Water Simultaneous Lightwave Information and Power Transfer 
Sub Title (in English)  
Keyword(1) Underwater optical wireless communication  
Keyword(2) Underwater simultaneous lightwave information and power transfer  
Keyword(3) Color shift keying  
Keyword(4) Solar noise  
Keyword(5) Power splitting  
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1st Author's Name Yusuke Kozawa  
1st Author's Affiliation Ibaraki University (Ibaraki Univ.)
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Speaker Author-1 
Date Time 2025-10-24 13:30:00 
Presentation Time 30 minutes 
Registration for RCS 
Paper # RCS2025-141 
Volume (vol) vol.125 
Number (no) no.214 
Page p.92 
#Pages 1 
Date of Issue 2025-10-16 (RCS) 

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