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Abstract
The generation and transfer of ultra-stable microwave signals are of paramount importance in numerous applications spanning from radar systems to communications and metrology. We demonstrate residual phase noise mitigation at 10 GHz of a directly modulated laser system through active control of the laser bias current. The latter is tuned to a finely selected point, where the current-to-phase dependence, measured at several microwave power and frequency values, is maximized. A residual phase noise of ${-}113\;{{\rm dBrad}^2}/{\rm Hz}$ at 1 Hz offset frequency from a 10 GHz carrier, with a fractional frequency stability of $1.2 \times {10^{- 16}}$ at 1 s and below ${10^{- 19}}$ at ${10^5}\;{\rm s}$, is measured. These performances are compliant with the transfer of the most stable microwave signals available to date, obtained with cryogenic sapphire oscillators or combs locked to cavity-stabilized lasers. This approach is of interest for the distribution of ultra-stable microwave signals in a very simple photonic configuration.
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