Our group is pursuing frequency comb based optical two-way time-frequency transfer to support state-of-the-art optical clock measurements. Optical clock networks will enable fundamental physics tests, increased sensitivity for coherent sensing, improved timing and navigation and the distribution of an optically-defined time standard.  However, these networks will require the parallel development of optical links. We have leveraged the advent of robust optical frequency combs along with advanced digital signal processing techniques to develop methods for ultra-precise time and frequency transfer over open air paths. 

Optical two-way time-frequency transfer has been used to synchronize clocks to within a femtosecond over 10-km scale paths and at terrestrial velocities. Our current work focuses on the continued advancement of optical methods of transferring time and frequency information for practical terrestrial and satellite operation.

key words

frequency comb; optical two-way time-frequency transfer; free-space optical time transfer; digital signal processing; optical clock networks; fiber frequency comb; optical time transfer; optical frequency transfer;

Citizenship:  Open to U.S. citizens

Level:  Open to Postdoctoral applicants