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Paper Abstract and Keywords
Presentation 2014-11-14 13:00
Digital coherent optical receivers using analog-to-digital conversion at the symbol rate
Kazuro Kikuchi (Univ. of Tokyo) OCS2014-87
Abstract (in Japanese) (See Japanese page) 
(in English) This paper discusses the principle of clock extraction and requirements for the sampling rate of AD converters in digital coherent receivers. When AD conversion is done at the rate of two samples per symbol, the clock frequency is extracted from the signal intensity after fixed compensation for accumulated group-velocity dispersion of fibers in the digital domain and succeeding DA conversion. Meanwhile, the sampling phase for each polarization tributary is adjusted with the adaptive digital filter. Since the aliasing effect associated with AD conversion is removed perfectly, such a receiver can cope with long-distance transmission over 1,000km, compensating for all of the linear transmission impairments. On the other hand, in short/medium-distance transmission below 100km, linear transmission impairments are not so remarkable. In such a case, AD conversion can be done at the symbol rate. The clock is extracted in the analog external circuit, and linear transmission impairments are compensated for to some extent even in the presence of the aliasing effect. The symbol-rate sampling scheme seems attractive for low-cost implementation of digital coherent receivers for >100-Gbit/s short/medium-reach applications.
Keyword (in Japanese) (See Japanese page) 
(in English) Optical fiber communications / Coherent optical receivers / Clock extraction / Digital signal processing / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 300, OCS2014-87, pp. 65-70, Nov. 2014.
Paper # OCS2014-87 
Date of Issue 2014-11-06 (OCS) 
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. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Conference Date 2014-11-13 - 2014-11-14 
Place (in Japanese) (See Japanese page) 
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Paper Information
Registration To OCS 
Conference Code 2014-11-BCT-OCS-OFT-CMN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Digital coherent optical receivers using analog-to-digital conversion at the symbol rate 
Sub Title (in English)  
Keyword(1) Optical fiber communications  
Keyword(2) Coherent optical receivers  
Keyword(3) Clock extraction  
Keyword(4) Digital signal processing  
1st Author's Name Kazuro Kikuchi  
1st Author's Affiliation University of Tokyo (Univ. of Tokyo)
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Date Time 2014-11-14 13:00:00 
Presentation Time 25 
Registration for OCS 
Paper # IEICE-OCS2014-87 
Volume (vol) IEICE-114 
Number (no) no.300 
Page pp.65-70 
#Pages IEICE-6 
Date of Issue IEICE-OCS-2014-11-06 

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