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Paper Abstract and Keywords
Presentation 2010-05-21 15:00
Log-likelihood coherent optical receiver -- High-speed ADCless Architecture --
Morio Toyoshima, Yozo Shoji, Yoshihisa Takayama (NICT), Takashi Maehata (SEI) SANE2010-13
Abstract (in Japanese) (See Japanese page) 
(in English) Coherent optical technologies have recently been receiving renewed interest in high bit rate communications. Such receivers have shot-noise-limited receiver sensitivity with sufficient local oscillator (LO) power; high frequency resolution at the intermediate frequency or baseband stage in highly dense frequency division multiplexed channels; improved receiver sensitivity compared with that of intensity modulation/direct detection (IMDD) systems; and active realization of multilevel signal transmission using not only intensity but also phase, frequency, and polarization states. While an optical phase-locked loop (PLL) that locks the LO phase to the signal phase is still difficult to achieve, digital signal processing (DSP) circuits are becoming increasingly faster, providing a simple and efficient means of estimating the carrier phase as well as the possibility of more powerful compensation for impairments in the electrical domain. The high-speed coherent receiver employs the so-called intradyne technique. This kind of receiver is based on a free-running LO laser and DSP. While this concept was proposed in 1991, the first implementation has been reported only recently. However, it requires high-speed analog-to-digital converters (ADCs) and the data rate cannot be enhanced without the development of the high-speed ADCs. In this paper, a log-likelihood coherent optical receiver is proposed, which consists of an optical part and an electrical part that includes comparators and digital circuits without ADCs. It is expected that the optical communications systems can be faster than that of current ones in the future.
Keyword (in Japanese) (See Japanese page) 
(in English) Coherent optical communications / analog-to-digital converter / log-likelihood / digital signal processing / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 46, SANE2010-13, pp. 19-23, May 2010.
Paper # SANE2010-13 
Date of Issue 2010-05-14 (SANE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 SANE  
Conference Date 2010-05-21 - 2010-05-21 
Place (in Japanese) (See Japanese page) 
Place (in English) National Defense Academy of Japan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Remote sensing and general 
Paper Information
Registration To SANE 
Conference Code 2010-05-SANE 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Log-likelihood coherent optical receiver 
Sub Title (in English) High-speed ADCless Architecture 
Keyword(1) Coherent optical communications  
Keyword(2) analog-to-digital converter  
Keyword(3) log-likelihood  
Keyword(4) digital signal processing  
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1st Author's Name Morio Toyoshima  
1st Author's Affiliation National Institute of Information and Communications Technology (NICT)
2nd Author's Name Yozo Shoji  
2nd Author's Affiliation National Institute of Information and Communications Technology (NICT)
3rd Author's Name Yoshihisa Takayama  
3rd Author's Affiliation National Institute of Information and Communications Technology (NICT)
4th Author's Name Takashi Maehata  
4th Author's Affiliation SUMITOMO ELECTRIC INDUSTRIES, LTD. (SEI)
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Speaker Author-1 
Date Time 2010-05-21 15:00:00 
Presentation Time 25 minutes 
Registration for SANE 
Paper # SANE2010-13 
Volume (vol) vol.110 
Number (no) no.46 
Page pp.19-23 
#Pages
Date of Issue 2010-05-14 (SANE) 


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