High coherence dual-comb based on phase locking to ultra-narrow linewidth lasers
Received:July 16, 2019  Revised:December 18, 2019  download
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Author NameAffiliationE-mail
CUI Jia-Hua Key Laboratory of Opto-electronic Information Technology of the Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China cuijiahua@tju.edu.cn 
LIN Bai-Ke Laboratory of Optical Frequency Standard, Time and Frequency Metrology Division, National Institute of Metrology, Beijing 100029, China
Department of Precision Instrument, Tsinghua University, Beijing 100084, China 
 
MENG Fei Laboratory of Optical Frequency Standard, Time and Frequency Metrology Division, National Institute of Metrology, Beijing 100029, China
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronics, Peking University, Beijing 100871, China 
mfei@nim.ac.cn 
CAO Shi-Ying Laboratory of Optical Frequency Standard, Time and Frequency Metrology Division, National Institute of Metrology, Beijing 100029, China  
YANG Ming-Zhe Key Laboratory of Opto-electronic Information Technology of the Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China  
LIN Yi-Ge Laboratory of Optical Frequency Standard, Time and Frequency Metrology Division, National Institute of Metrology, Beijing 100029, China  
SONG You-Jian Key Laboratory of Opto-electronic Information Technology of the Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China  
HU Ming-Lie Key Laboratory of Opto-electronic Information Technology of the Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China  
FANG Zhan-Jun Laboratory of Optical Frequency Standard, Time and Frequency Metrology Division, National Institute of Metrology, Beijing 100029, China  
Abstract:A dual-comb system based on phase locking to ultra-narrow linewidth lasers is studied and implemented in this paper. Two Erbium-doped mode-locked lasers with repetition rates of about 200 MHz and repetition rate difference of about 17 kHz were simultaneously locked to two narrow-linewidth continuous wave lasers at 1 542 nm and 1 560 nm, respectively. Hence, dual-comb with high coherence and stability is achieved. After phase locking, the comb linewidth of a single comb is less than 5 Hz(limited by test condition), and the relative linewidth of two combs is less than 0.35 Hz. The dual comb system has important application value in high precision spectral analysis, time-frequency transmission, and especially absolute distance measurement.
keywords:narrow linewidth optical frequency comb  dual-comb  phase locking  coherency
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