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Paper Abstract and Keywords
Presentation 2012-07-26 14:05
32 RZ/QAM coherent optical transmission employing an RZ-CW conversion technique
Keisuke Kasai, David Odeke Otuya, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OCS2012-23
Abstract (in Japanese) (See Japanese page) 
(in English) Coherent optical time division multiplexing (OTDM) transmission with a multi-level modulation format has attracted a lot of attention as a ultra-high speed and highly spectral-efficient optical transmission system. However, in the conventional coherent OTDM, it is difficult to demodulate an ultra-high speed, multi-level RZ data signal with a high signal to noise ratio due to input optical power limitation of coherent detection circuits. Recently, we proposed a demodulation scheme by using an RZ-CW conversion scheme in a coherent receiver, in which the transmitted coherent RZ data are OTDM demultiplexed and converted into a data signal on a CW carrier. In this paper, we demonstrate an advantage of the scheme with 10 Gsymbol/s, 4- and 8-OTDM 32 RZ/QAM demodulation experiments. Furthermore, we have successfully transmitted a polarization multiplexed, 10 Gsymbol/s, 32 RZ/QAM (800 Git/s) data signal over 225 km by using this conversion scheme.
Keyword (in Japanese) (See Japanese page) 
(in English) Coherent transmission / Optical time division multiplexing / QAM / Optical phase-locked loop / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 152, OCS2012-23, pp. 13-18, July 2012.
Paper # OCS2012-23 
Date of Issue 2012-07-19 (OCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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Conference Information
Committee OCS  
Conference Date 2012-07-26 - 2012-07-26 
Place (in Japanese) (See Japanese page) 
Place (in English)  
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Paper Information
Registration To OCS 
Conference Code 2012-07-OCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) 32 RZ/QAM coherent optical transmission employing an RZ-CW conversion technique 
Sub Title (in English)  
Keyword(1) Coherent transmission  
Keyword(2) Optical time division multiplexing  
Keyword(3) QAM  
Keyword(4) Optical phase-locked loop  
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1st Author's Name Keisuke Kasai  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name David Odeke Otuya  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Masato Yoshida  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Toshihiko Hirooka  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
5th Author's Name Masataka Nakazawa  
5th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2012-07-26 14:05:00 
Presentation Time 25 minutes 
Registration for OCS 
Paper # OCS2012-23 
Volume (vol) vol.112 
Number (no) no.152 
Page pp.13-18 
#Pages
Date of Issue 2012-07-19 (OCS) 


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