2 research outputs found
Digital Doppler-cancellation servo for ultra-stable optical frequency dissemination over fiber
Progress made in optical references, including ultra-stable Fabry-Perot
cavities, optical frequency combs and optical atomic clocks, have driven the
need for ultra-stable optical fiber networks. Telecom-wavelength ultra-pure
optical signal transport has been demonstrated on distances ranging from the
laboratory scale to the continental scale. In this manuscript, we present a
Doppler-cancellation setup based on a digital phase-locked loop for
ultra-stable optical signal dissemination over fiber. The optical phase
stabilization setup is based on a usual heterodyne Michelson-interferometer
setup, while the Software Defined Radio (SDR) implementation of the
phase-locked loop is based on a compact commercial board embedding a field
programmable gate array, analog-to-digital and digital-to-analog converters.
Using three different configurations including an undersampling method, we
demonstrate a 20 m long fiber link with residual fractional frequency
instability as low as at 1000 s, and an optical phase noise of
dBc/Hz at 1 Hz with a telecom frequency carrier.Comment: 11 pages, 6 figure
Digital Doppler-cancellation servo for ultra-stable optical frequency dissemination over fiber
International audienceProgress made in optical references, including ultra-stable Fabry-Perot cavities, optical frequency combs and optical atomic clocks, have driven the need for ultra-stable optical fiber networks. Telecom-wavelength ultra-pure optical signal transport has been demonstrated on distances ranging from the laboratory scale to the continental scale. In this manuscript, we present a Doppler-cancellation setup based on a digital phase-locked loop for ultra-stable optical signal dissemination over fiber. The optical phase stabilization setup is based on a usual heterodyne Michelson-interferometer setup, while the Software Defined Radio (SDR) implementation of the phase-locked loop is based on a compact commercial board embedding a field programmable gate array, analog-to-digital and digital-to-analog converters. Using three different configurations including an undersampling method, we demonstrate a 20 m long fiber link with residual fractional frequency instability as low as at 1000 s, and an optical phase noise of dBc/Hz at 1 Hz with a telecom frequency carrier