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Paper Abstract and Keywords
Presentation 2021-11-19 11:15
[Invited Talk] Recent progress of coherent free-space optical communications
Chao Zhang (Shimane Univ.), Kota Uyama, Zheyuan Zhang, Sze Yun Set, Shinji Yamashita (Univ. of Tokyo) OFT2021-54
Abstract (in Japanese) (See Japanese page) 
(in English) Free-space optical communication is preferred for its advantages over radio frequency wireless communication, such as no spectrum licensing, large bandwidth, inherent security, electromagnetic interference immunity etc. Moreover, free-space optical communication also benefits from low-cost installation and maintenance. It has been studied for the next generation access networks, inter-building connections, ground-to-unmanned aerial vehicle links, underwater communication applications, inter-satellite links, deep space links etc. Among various detection approaches, coherent detection can achieve the best sensitivity in a bandwidth-limited condition, effectively demodulate optical multilevel-coded signals to attain high spectral efficiency, offer excellent background noise rejection. However, such an attractive free-space optical communication suffers from waveform distortion, scintillation, phase fluctuations etc. after transmission in atmospheric channels. In this article, we present an up-to-date survey on coherent free-space optical communication, the atmospheric turbulent effects especially impacts of turbulence in free-space optical links, and countermeasures against such impairments.
Keyword (in Japanese) (See Japanese page) 
(in English) 6G / free-space optical communication / atmospheric turbulence / scintillation / wavefront distortion / coherent detection / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 252, OFT2021-54, pp. 17-22, Nov. 2021.
Paper # OFT2021-54 
Date of Issue 2021-11-11 (OFT) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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 OFT OCS IEE-CMN ITE-BCT  
Conference Date 2021-11-18 - 2021-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OFT 
Conference Code 2021-11-OFT-OCS-CMN-BCT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Recent progress of coherent free-space optical communications 
Sub Title (in English)  
Keyword(1) 6G  
Keyword(2) free-space optical communication  
Keyword(3) atmospheric turbulence  
Keyword(4) scintillation  
Keyword(5) wavefront distortion  
Keyword(6) coherent detection  
Keyword(7)  
Keyword(8)  
1st Author's Name Chao Zhang  
1st Author's Affiliation Shimane University (Shimane Univ.)
2nd Author's Name Kota Uyama  
2nd Author's Affiliation University of Tokyo (Univ. of Tokyo)
3rd Author's Name Zheyuan Zhang  
3rd Author's Affiliation University of Tokyo (Univ. of Tokyo)
4th Author's Name Sze Yun Set  
4th Author's Affiliation University of Tokyo (Univ. of Tokyo)
5th Author's Name Shinji Yamashita  
5th Author's Affiliation University of Tokyo (Univ. of Tokyo)
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Speaker Author-1 
Date Time 2021-11-19 11:15:00 
Presentation Time 45 minutes 
Registration for OFT 
Paper # OFT2021-54 
Volume (vol) vol.121 
Number (no) no.252 
Page pp.17-22 
#Pages
Date of Issue 2021-11-11 (OFT) 


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