US 12,149,042 B2
Method and system for automatically controlling mode-locking of a optical frequency comb
Heping Zeng, Chongqing (CN); Shuang Li, Chongqing (CN); and Xuling Shen, Shanghai (CN)
Assigned to CHONGQING INSTITUTE OF EAST CHINA NORMAL UNIVERSITY, Chongqing (CN); SHANGHAI LANGYAN OPTOELECTRONICS TECHNOLOGY CO., LTD., Shanghai (CN); and EAST CHINA NORMAL UNIVERSITY, Shanghai (CN)
Filed by CHONGQING INSTITUTE OF EAST CHINA NORMAL UNIVERSITY, Chongqing (CN); SHANGHAI LANGYAN OPTOELECTRONICS TECHNOLOGY CO., LTD., Shanghai (CN); and EAST CHINA NORMAL UNIVERSITY, Shanghai (CN)
Filed on Feb. 7, 2021, as Appl. No. 17/169,491.
Claims priority of application No. 202010113454.5 (CN), filed on Feb. 24, 2020.
Prior Publication US 2021/0265803 A1, Aug. 26, 2021
Int. Cl. H01S 3/13 (2006.01); H01S 3/1106 (2023.01); H01S 3/1109 (2023.01); H01S 3/131 (2006.01); H01S 3/10 (2006.01)
CPC H01S 3/1109 (2013.01) [H01S 3/1106 (2013.01); H01S 3/1305 (2013.01); H01S 3/1312 (2013.01); H01S 3/10069 (2013.01); H01S 3/1307 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for automatically controlling mode-locking of an optical frequency comb, comprising:
collecting working feedback parameters of an optical frequency comb system; wherein the working feedback parameters comprises mode-locking frequency parameters, a power parameter of a pump source, a temperature parameter of the pump source, and a working environment temperature parameter of the pump source; the mode-locking frequency parameters comprises a repetition frequency parameter of an optical comb carrier and an envelope phase parameter of the optical comb carrier; and
retrieving a stored control parameter of a working condition in mode-locked state, and combining with the working feedback parameters, to dynamically adjust a working power of the pump source or/and a temperature of the working environment of the pump source in the optical frequency comb system, thereby completing the mode-locking of the optical frequency comb; and according to a control parameter of an actual working condition after the mode-locking, updating the stored control parameter of the working condition in the mode-locked state for subsequent retrieval;
wherein the stored control parameter of the working condition in the mode-locked state comprises a power-temperature curve under mode-locked state in a starting working condition and setting information of the working power of the pump source corresponding to mode-locked state in a stable working condition; the power-temperature curve shows a relationship between a temperature of the pump source in the starting working condition and a working power of the pump source required for mode-locking;
a process of dynamically adjusting the working power of the pump source comprises:
upon starting, according to a current temperature parameter of the pump source, searching a working power value of the pump source required for mode-locking corresponding to the current temperature of the pump source from the power-temperature curve under the mode-locked state in the starting working condition; adjusting and setting the working power of the pump source according to the working power value;
determining the mode-locked state of an optical comb according to a current mode-locking frequency parameter; if the optical comb is mode-locked, maintaining the working power value of the pump source; if the optical comb is not in the mode-locked state, further adjusting the working power of the pump source until the optical comb is in the mode-locked state, and maintaining the working power value of the pump source, so that the optical frequency comb is maintained in the mode-locked state;
when mode-locking time of the optical comb after starting reaches a preset starting stabilization duration, adjusting and setting the working power of the pump source according to the setting information of the working power of the pump source corresponding to the mode-locked state in the stable working condition, so that the optical frequency comb is maintained in the mode-locked state.