Hundred-Femtosecond-Level Concise Optical Time Delay Measurement System Based on Linear Optical Sampling

Abstract

Fiber-delay measurement is one of the key fundamental technologies in numerous fields. Here we propose and experimentally demonstrate a high-precision and concise optical time delay measurement system based on the technique of linear optical sampling, reaching the precision better than 100 fs under averaging. The use of only two optical frequency combs without locking the carrier-envelope-offset frequency greatly simplifies the structure of the time-delay measurement system. We also experimentally investigate the current limitations on the precision of the system. The timing jitter noises of two sources are mainly non-common mode, and are both restricted to the frequency sources. Our results indicate that the proposed device can measure fiber length fluctuations below 10 $\mu \mathrm{m}$, paving the way for further analyses of the external disturbances on the fiber link.

arXiv comment7 pages, 4 figures

References in corpus (11)

• Atomic clock performance beyond the geodetic limit
• A clock network for geodesy and fundamental science
• Optical two-way time and frequency transfer over free space
• Test of special relativity using a fiber network of optical clocks
• Stability of the proton-to-electron mass ratio
• Sub-femtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers
• Direct Comparison of Distant Optical Lattice Clocks at the $10^{-16}$ Uncertainty
• Femtosecond Synchronization of Optical Clocks Off of a Flying Quadcopter
• Remote atomic clock synchronization via satellites and optical fibers
• High-resolution, large dynamic range fiber length measurement based on frequency-shifted asymmetrical Sagnac interferometer
• Highly accurate fiber transfer delay measurement with large dynamic range

Cited by in corpus (2)

• Dual-comb-enhanced microwave clock synchronization over commercial fiber
• Time-Frequency Transfer over Optical Fiber