All-Fiber Polarization-Maintaining Optical Frequency Combs for Time-Frequency Transfer

The extensive application of optical frequency comb technology has profoundly transformed the developments of time-frequency transfer, optical frequency measurement, and absolute distance measurement. Optical frequency combs can serve as conversion tools for high-precision frequency transfer and comparison among different optical frequency standards in different locations. This work has developed a highly robust all-fiber polarization-maintaining optical frequency comb, with a spectral bandwidth of 11 nm, a repetition rate of 117 MHz, an output power of 2.8 mW, and a pulse width of 218 fs, laying a foundation for conducting free-space precise time-frequency transfer and further fulfilling the requirements of applications in complex environments.