Abstract

Transfer of a high-stability and ultralow-jitter timing signal through a fiber network via a mode-locked fiber laser is demonstrated. With active cancellation of the fiber-transmission noise, the fractional instability for transfer of a radio-frequency signal through a 6.9- $\left(4.5\text{-}\right)\mathrm{km}$ round-trip installed (laboratory-based) fiber network is below $9\left(7\right)\times {10}^{-15}{\tau }^{-1∕2}$ for an averaging time $\tau ⩾1\mathrm{s}$, limited by the noise floor of the frequency-counting system. The noise cancellation reduces the rms timing jitter, integrated over a bandwidth from $1\mathrm{Hz}$ to $100\mathrm{kHz}$, to 37 $\left(20\right)\mathrm{fs}$ for the installed (laboratory-based) fiber network, representing what is to our knowledge the lowest reported jitter for transfer of a timing signal over kilometer-scale distances using an installed (laboratory-based) optical-fiber network.

© 2005 Optical Society of America

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