Optical frequency stabilizer using optical fiber delay line, and method for generating stable optical frequency signal

A frequency stabilizer comprising:

• a first wavelength division multiplexer that multiplexes signals of different frequencies extracted from a plurality of pulsed lasers;
• a delay line interferometer that receives an optical signal multiplexed by the first wavelength division multiplexer, divides and transmits the received optical signal to a reference arm and a delay arm including an optical fiber delay line, and then outputs an interference signal between signals passing through the reference arm and the delay arm;
• a second wavelength division multiplexer that dividing the interference signal into a frequency signal corresponding to each pulsed laser;
• a plurality of photoelectric converters for converting each frequency signal divided by the second wavelength division multiplexer into a corresponding electrical signal;
• a plurality of mixers for generating a baseband signal of a corresponding electrical signal output from each photoelectric converter by mixing a carrier frequency signal;
• and
• a plurality of feedback controllers for transmitting a control signal generated based on each baseband signal to the corresponding pulsed laser,
• wherein the multiplexed optical signal passing through the delay arm is weighted with a delay time caused by the optical fiber delay line compared to the optical signal passing through the reference arm, and the multiplexed optical signal passing through the delay arm is frequency shifted to a carrier frequency of an oscillator.