Abstract

We report on all-fiber Michelson interferometer-based repetition-rate stabilization of femtosecond mode-locked lasers down to $1.3\times {10}^{-14}$ frequency instability and 1.4 fs integrated jitter in a 1 s time scale. The use of a compactly packaged 10 km long single-mode fiber (SMF)-28 fiber link as a timing reference allows the scaling of phase noise at a 10 GHz carrier down to $-80\mathrm{dBc}/\mathrm{Hz}$ at 1 Hz Fourier frequency. We also tested a 500 m long low-thermal-sensitivity fiber as a reference and found that, compared to standard SMF-28 fiber, it can mitigate the phase noise divergence by $\sim 10\mathrm{dB}/\mathrm{dec}$ in the 0.1–1 Hz Fourier frequency range. These results suggest that the use of a longer low-thermal-sensitivity fiber may achieve sub-femtosecond integrated timing jitter with sub-${10}^{-14}$–level frequency instability in repetition rate by a simple and robust all-fiber-photonic method.

© 2017 Optical Society of America

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