Study Of Transfer Oscillator Technology Based On Fiber Optical Frequency Comb

Time-frequency,as one of the most important parts of the metrology area,plays an important role in many other fields.At present,the most accurate time-frequency value reproduction standard is optical clock,whose clock signal belongs to the optical frequency band.In practical research and applications,it is necessary to transmit the highly stable optical clock signal to other optical frequency bands or radio frequency bands by using optical frequency comb.Traditional time-frequency transmission requires a narrow line-width optical frequency comb with good noise performance to avoid introducing too much comb noise in transmission process.The transfer oscillator technology we studied can eliminate the noise of the optical frequency comb in the progress.By using a normal fiber optical frequency comb with high noise,high stability of the optical frequency signal transmission can be accomplished,which should use a narrow line-width optical comb in traditional methods.The dependence of traditional narrow line-width optical frequency comb on the ability of fast servo in frequency transmission process is overcome,which makes the system more reliable and stable.The main work and innovations of this paper are as follows:1.Applications and research progress of transfer oscillator technology at home and abroad are summarized.The basic principle of the transfer oscillator system based on optical frequency comb is described.The key parameters such as line-width and frequency drift of the reference light source and comb are experimentally measured.2.The transfer oscillator system is designed and built.It is the first time to use fiber optical comb to realize the transfer oscillator in domestic.After locking,the relative instability of 5×10^-19@1 s of the beat note within the loop is obtained.Further,the"dual-transfer oscillator system"is designed and implemented to transmit the frequency characteristics of the same master laser to two independent slave lasers.The experimental result shows that the relative instability of the beat note between two slave lasers is up to 1×10^-17@1 s.3.A comparative experiment between dual-transfer oscillator system and directly offset frequency locking system was conducted,verifying the ability of transfer oscillator to resist comb noise.The application value of this technology in time-frequency transmission,optical clock comparison and other fields is demonstrated.