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Paper Abstract and Keywords
Presentation 2018-05-11 17:05
[Special Invited Talk] Investigation of reduced skew of 106-Gb/s PAM4 waveform with optical orthogonal polarization multiplexing by utilizing 1.3-um directly modulated lasers
Kouji Nakahara (Oclaro), Riu Hirai (Hitachi), Takeshi Kitatani (Oclaro), Nobuhiko Kikuchi (Hitachi), Takayoshi Fukui, Kaoru Okamoto, Yasushi Sakuma, Kohichi R. Tamura, Shigehisa Tanaka (Oclaro) OCS2018-9 OPE2018-9 LQE2018-9
Abstract (in Japanese) (See Japanese page) 
(in English) One of technical issues of PAM-4 modulation by utilizing directly modulated lasers is distorted into a shew shape eye-diagram. To reduce this shew diagram, we proposed that orthogonal polarization-multiplexing of two NRZ signals with optical power ratio of 2:1 in directly modulated lasers generates skewless PAM-4 waveforms. This optical signal can be received as the PAM4 signal by a standard direct detection receiver. We achieved skewless 106-Gb/s/lane PAM-4 signals with multiplexing mutually orthogonal polarized 53-Gb/s NRZ signals emitted by directly modulated lasers. In addition, transmission over a 10-km SM fiber was demonstrated at 106-Gb/s PAM4 without the non-linearity compensation.
Keyword (in Japanese) (See Japanese page) 
(in English) directly modulated laser / NRZ / PAM4 / skew / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 25, LQE2018-9, pp. 31-34, May 2018.
Paper # LQE2018-9 
Date of Issue 2018-05-04 (OCS, OPE, LQE) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF OCS2018-9 OPE2018-9 LQE2018-9

Conference Information
Committee OPE OCS LQE  
Conference Date 2018-05-11 - 2018-05-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg (Tokyo) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To LQE 
Conference Code 2018-05-OPE-OCS-LQE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of reduced skew of 106-Gb/s PAM4 waveform with optical orthogonal polarization multiplexing by utilizing 1.3-um directly modulated lasers 
Sub Title (in English)  
Keyword(1) directly modulated laser  
Keyword(2) NRZ  
Keyword(3) PAM4  
Keyword(4) skew  
1st Author's Name Kouji Nakahara  
1st Author's Affiliation Oclaro, Japan (Oclaro)
2nd Author's Name Riu Hirai  
2nd Author's Affiliation Hitachi Ltd., (Hitachi)
3rd Author's Name Takeshi Kitatani  
3rd Author's Affiliation Oclaro, Japan (Oclaro)
4th Author's Name Nobuhiko Kikuchi  
4th Author's Affiliation Hitachi Ltd., (Hitachi)
5th Author's Name Takayoshi Fukui  
5th Author's Affiliation Oclaro, Japan (Oclaro)
6th Author's Name Kaoru Okamoto  
6th Author's Affiliation Oclaro, Japan (Oclaro)
7th Author's Name Yasushi Sakuma  
7th Author's Affiliation Oclaro, Japan (Oclaro)
8th Author's Name Kohichi R. Tamura  
8th Author's Affiliation Oclaro, Japan (Oclaro)
9th Author's Name Shigehisa Tanaka  
9th Author's Affiliation Oclaro, Japan (Oclaro)
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Date Time 2018-05-11 17:05:00 
Presentation Time 25 
Registration for LQE 
Paper # IEICE-OCS2018-9,IEICE-OPE2018-9,IEICE-LQE2018-9 
Volume (vol) IEICE-118 
Number (no) no.23(OCS), no.24(OPE), no.25(LQE) 
Page pp.31-34 
#Pages IEICE-4 
Date of Issue IEICE-OCS-2018-05-04,IEICE-OPE-2018-05-04,IEICE-LQE-2018-05-04 

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