Method and apparatus for optical frequency comb locking

An apparatus for optical frequency comb locking, comprising:

• an acquisition unit, configured to acquire a first electrical signal outputted by a carrier-envelope offset (CEO) frequency detection module and a second electrical signal outputted by a repetition rate detection module in an optical frequency comb system;
• a first generation unit, configured to generate a target CEO frequency error signal based on the first electrical signal and a CEO frequency radio frequency (RF) reference signal, wherein a proportional-integral operation is performed on the target CEO frequency error signal to obtain target CEO frequency control data;
• a second generation unit, configured to generate a target repetition rate error signal based on the second electrical signal and a repetition rate RF reference signal, wherein the proportional-integral operation is performed on the target repetition rate error signal to obtain target repetition rate control data;
• a first control quantity determination unit, configured to input the target CEO frequency control data and the target repetition rate control data to a first decoupling module to output a first control quantity, wherein the first decoupling module performs calculation on the target CEO frequency control data and the target repetition rate control data by using coupling coefficients in a coupling coefficient set to obtain the first control quantity, wherein the coupling coefficient set comprises a first coupling coefficient, a second coupling coefficient, a third coupling coefficient and a fourth coupling coefficient;
• and
• a second control quantity determination unit, configured to input the target CEO frequency control data and the target repetition rate control data to a second decoupling module to output a second control quantity, wherein the second decoupling module performs calculation on the target CEO frequency control data and the target repetition rate control data by using the coupling coefficients in the coupling coefficient set to obtain the second control quantity, and wherein
• a first digital-to-analog converter converts the first control quantity into a first control signal, and simultaneously, a second digital-to-analog converter converts the second control quantity into a second control signal;
• the first control signal is amplified via a first amplifier, and the amplified first control signal is inputted to a CEO frequency control module in the optical frequency comb system;
• and the second control signal is amplified via a second amplifier, and the amplified second control signal is inputted to a repetition rate control module in the optical frequency comb system.