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Paper Abstract and Keywords
Presentation 2016-07-28 11:05
Turbo Equalization for Super-Nyquist WDM Systems Based on Duobinary Shaping
Shuai Yuan, Koji Igarashi (Osaka Univ.), Takehiro Tsuritani, Itsuro Morita (KDDI Lab.) OCS2016-23
Abstract (in Japanese) (See Japanese page) 
(in English) In Super-Nyquist wavelength division multiplexed (WDM) optical fiber transmission systems with channel spacing of smaller than a signal baudrate, duobinary shaping with bandwidth of half a signal baudrate is usually introduced to suppress linear crosstalk from adjacent WDM channels. Although it gives rise to remarkable inter-symbol interference (ISI), ISI can be compensated for by the use of a maximum likelihood (ML) decoder in a receiver. Note that errors tend to propagate after the ML decoder for duobinary shaping. Such continuous errors remarkably degrade the performance of forward error correction (FEC) after the ML decoder. In order to improve the performance of FEC in Super-Nyquist WDM systems, we propose application of turbo equalization to the receiver. The turbo equalizer is based on a feedback configuration between the first ML decoder for duobinary shaping and the second FEC decoder. By iterative process through the feedback configuration, the error propagation can be suppressed. We evaluate experimentally and numerically the performance of turbo equalization for Super-Nyquist WDM signals encoded by turbo code with 20% overhead. Without any FEC, we found 1-dB penalty due to continuous excess errors caused by ML decoder for duobinary shaping in the pre-FEC BER performance of Super-Nyquist WDM signals, compared with Nyquist WDM signals. Using turbo equalization compensating for such continuous errors, the penalty in the BER performance can be improved to be 0.5 dB. As results, pre-FEC BER threshold for achieving post-FEC BER of smaller than 10-5 can be improved in the Super-Nyquist WDM case.
Keyword (in Japanese) (See Japanese page) 
(in English) Wavelength division multiplexing / spectral shaping / forward error correction / / / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 164, OCS2016-23, pp. 17-22, July 2016.
Paper # OCS2016-23 
Date of Issue 2016-07-21 (OCS) 
ISSN Print edition: ISSN 0913-5685    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 OCS2016-23

Conference Information
Committee OCS  
Conference Date 2016-07-28 - 2016-07-29 
Place (in Japanese) (See Japanese page) 
Place (in English) tokodai-kuramae-kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OCS 
Conference Code 2016-07-OCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Turbo Equalization for Super-Nyquist WDM Systems Based on Duobinary Shaping 
Sub Title (in English)  
Keyword(1) Wavelength division multiplexing  
Keyword(2) spectral shaping  
Keyword(3) forward error correction  
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1st Author's Name Shuai Yuan  
1st Author's Affiliation Osaka University (Osaka Univ.)
2nd Author's Name Koji Igarashi  
2nd Author's Affiliation Osaka University (Osaka Univ.)
3rd Author's Name Takehiro Tsuritani  
3rd Author's Affiliation KDDI R&D Laboratories (KDDI Lab.)
4th Author's Name Itsuro Morita  
4th Author's Affiliation KDDI R&D Laboratories (KDDI Lab.)
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Speaker Author-1 
Date Time 2016-07-28 11:05:00 
Presentation Time 25 minutes 
Registration for OCS 
Paper # OCS2016-23 
Volume (vol) vol.116 
Number (no) no.164 
Page pp.17-22 
#Pages 6 
Date of Issue 2016-07-21 (OCS) 

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