Method and system for automatically controlling mode-locking of a optical frequency comb

Patent metadata

Field	Value
Publication number	US-12149042-B2
Application number	US-202117169491-A
Country	US
Kind code	B2
Filing date	Feb 7, 2021
Priority date	Feb 24, 2020
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A method and a system for automatically controlling mode-locking of an optical frequency comb, where the stored control parameters of the working condition in the mode-locked state is combined with the collected working feedback parameters of the optical frequency comb system to dynamically adjust and control the working power of the pump source or/and the temperature of the working environment of the pump source, which not only greatly shortens the control time for stable mode-locking and realizes a fast mode-locking control, but also reduces unnecessary power consumption, thereby further guaranteeing the energy-saving effect of power adjustment control process. The present disclosure well maintains the stable working conditions of the optical comb system, and realizes the mode-locking optimization control of an update mode for the big data, thereby effectively improving the mode-locking control process of the optical frequency comb system, and providing higher operation stability and measurement accuracy.

First claim

What is claimed is:

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.

2. The method of claim 1 , wherein a process of updating the stored control parameter of the working condition in the mode-locked state comprises:
after further adjusting the working power of the pump source until the optical comb is in the mode-locked state, feeding back the working power value of the pump source in the mode-locked state and the current temperature of the pump source; and updating a working power value of the pump source located at a point of the current temperature of the pump source in the power-temperature curve under the mode-locked state in the starting working condition according to the working power value of the pump source.

3. The method of claim 1 , wherein the setting information of the working power of the pump source corresponding to the mode-locked state in the stable working condition comprises a power-temperature curve under the mode-locked state in the stable working condition, showing a relationship between the temperature of the pump source and the working power of the pump source required for mode-locking in the stable working condition;
a process of adjusting and setting the working power of the pump source according to the setting information of the working power of the pump source in the stable working condition comprises:
searching a working power value of the pump source required for mode-locking corresponding to a current temperature of the working environment of the pump source in real time from the power-temperature curve under the mode-locked state in the stable working condition according to the current temperature parameter of the pump source; adjusting and setting the pump source according to the working power value;
determining the mode-locked state of the optical comb by detecting a current mode-locking frequency parameter in real time; if the optical comb is mode-locked, maintaining the working power value of the pump source; if the optical comb is out of the mode-locked state, 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.

4. The method of claim 3 , wherein a process of updating the stored control parameter of the working condition in the mode-locked state comprises:
after adjusting the working power of the pump source due to a mode-unlocking of the optical comb until the optical comb is mode-locked, feeding back the working power value of the pump source and the current temperature of the pump source after the optical comb is re-mode-locked; and updating a working power value of the pump source located at a point of the current temperature of the pump source in the power-temperature curve under the mode-locked state in the starting working condition according to the working power value of the pump source.

5. 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 control parameter of the working condition comprises a mode-locking reference environment temperature parameter and a reference pump source temperature parameter in a stable working condition;
a process of dynamically adjusting the temperature of the working environment of the pump source comprises:
upon starting, adjusting the temperature of the working environment of the pump source according to the mode-locking reference environment temperature parameter; after the temperature of the working environment of the pump source reaches the mode-locking reference environment temperature, continuously controlling the temperature of the working environment of the pump source according to the mode-locking reference environment temperature parameter; determini

Assignees

• Chongqing Institute Of East China Normal Univ
• Shanghai Langyan Optoelectronics Tech Co Ltd
• Univ East China Normal

Inventors

• Zeng Heping
• Li Shuang
• Shen Xuling

Classifications

• H01S3/1106 Primary

  Mode locking · CPC title

• H01S3/1312

  by controlling the optical pumping · CPC title

• H01S3/1307

  Stabilisation of the phase · CPC title

• H01S3/1305

  Feedback control systems · CPC title

• H01S3/10069

  Memorized or pre-programmed characteristics, e.g. look-up table [LUT] · CPC title