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Paper Abstract and Keywords
Presentation 2020-11-20 15:30
Spectral linewidth reduction of hybrid tunable laser by loading optical negative feedback circuit
Tatsuki Komatsubara, Toshiaki Okachi (Waseda Univ.), Nobuhide Yokota, Hiroshi Yasaka (Tohoku Univ.), Tomohiro Kita (Waseda Univ.) OPE2020-71 LQE2020-51 Link to ES Tech. Rep. Archives: OPE2020-71 LQE2020-51
Abstract (in Japanese) (See Japanese page) 
(in English) Spectral linewidth of a hybrid tunable laser consisted from SOA and Si optical circuits is reduced by loading an optical negative feedback circuit. In this study, Si optical ring filter is used as a frequency discriminator for the optical negative feedback circuit. In order to minimize the spectral linewidth of the laser source, coupling efficiency between the laser cavity and the optical negative feedback circuit is optimized through calculation of power spectral density of FM noise. It is confirmed that the narrow spectral linewidth of less than 10 kHz can be obtained by setting the coupling efficiency to optimized value.
Keyword (in Japanese) (See Japanese page) 
(in English) Optical negative feedback / Hybrid tunable lasers / Linewidth narrowing / Ring resonator / Frequency noise / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 244, LQE2020-51, pp. 129-132, Nov. 2020.
Paper # LQE2020-51 
Date of Issue 2020-11-13 (OPE, LQE) 
ISSN Online edition: ISSN 2432-6380
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Conference Information
Committee OPE LQE  
Conference Date 2020-11-20 - 2020-11-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To LQE 
Conference Code 2020-11-OPE-LQE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Spectral linewidth reduction of hybrid tunable laser by loading optical negative feedback circuit 
Sub Title (in English)  
Keyword(1) Optical negative feedback  
Keyword(2) Hybrid tunable lasers  
Keyword(3) Linewidth narrowing  
Keyword(4) Ring resonator  
Keyword(5) Frequency noise  
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1st Author's Name Tatsuki Komatsubara  
1st Author's Affiliation Waseda University (Waseda Univ.)
2nd Author's Name Toshiaki Okachi  
2nd Author's Affiliation Waseda University (Waseda Univ.)
3rd Author's Name Nobuhide Yokota  
3rd Author's Affiliation Research Institute of Electrical Communication, Tohoku University (Tohoku Univ.)
4th Author's Name Hiroshi Yasaka  
4th Author's Affiliation Research Institute of Electrical Communication, Tohoku University (Tohoku Univ.)
5th Author's Name Tomohiro Kita  
5th Author's Affiliation Waseda University (Waseda Univ.)
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Speaker Author-1 
Date Time 2020-11-20 15:30:00 
Presentation Time 120 minutes 
Registration for LQE 
Paper # OPE2020-71, LQE2020-51 
Volume (vol) vol.120 
Number (no) no.243(OPE), no.244(LQE) 
Page pp.129-132 
#Pages
Date of Issue 2020-11-13 (OPE, LQE) 


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