Short-haul fibre-optic communication link with a phase noise compensation system for optical frequency signal transmission

Khabarova, K. Yu.; Kudeyarov, K. S.; Vishnyakova, G. A.; Kolachevsky, N. N.

doi:10.1070/qel16471

Cited by 10 publications

(4 citation statements)

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“…Δν meas s Δν meas d can be eliminated by the active compensation [25], which is planned in the near future.…”

Section: Resultsmentioning

confidence: 99%

Synchronous Comparison of Two Thulium Optical Clocks

Golovizin,

Mishin,

Provorchenko

et al. 2024

Jetp Lett.

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The experimental comparison of two thulium optical lattice clocks in a time interval of up to one hour has been carried out. The synchronous comparison of a clock transition in two independent atomic ensembles using a single ultrastable laser has allowed us to eliminate fluctuations of the laser frequency from the measured frequency difference and to reach a relative measurement error of 10–16 after 500-s averaging, which corresponds to a relative instability of $$2 \times {{10}^{{ - 15}}}{\text{/}}\sqrt \tau $$. The successful demonstration of the long-term operation of two systems using the synchronous comparison of clock transitions opens the possibility of studying systematic shifts in thulium optical clocks with an uncertainty of 10–17.

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“…Δν meas s Δν meas d can be eliminated by the active compensation [25], which is planned in the near future.…”

Section: Resultsmentioning

confidence: 99%

Synchronous Comparison of Two Thulium Optical Clocks

Golovizin,

Mishin,

Provorchenko

et al. 2024

Jetp Lett.

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“…The frequency of the round-trip signal during the transmission over the short 5 m fiber between setup modules in the lab [28] and a 2.8 km spooled fiber was measured. No special care was taken to isolate the spool from the environmental perturbations.…”

Section: Resultsmentioning

confidence: 99%

2.8 km fiber link with phase noise compensation for transportable Yb⁺ optical clock characterization

et al. 2018

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The operation of a 2.8 km fiber link at 1.14 µm for ultrastable optical frequency dissemination, which will allow for the characterization of transportable Yb + based optical clock instability via a comparison to another frequency standard, was demonstrated. Active fiber noise compensation allows for the obtaining of a fractional frequency instability of 2 × 10 −19 at a 1100 s averaging time. The performance of the link under the influence of mechanical perturbations was also tested.

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“…The beat note unit was assembled on the optical breadboard of the vertical cavity. The laser light of the horizontal system was transmitted to the vertical one via stabilized fiber link with the compensation of fiberinduced phase noise 35 .…”

Section: Characterization Of Laser Systemsmentioning

confidence: 99%

“…Vibrations can influence the frequency of the cavity mode not only by a change in the distance between the cavity mirrors caused by the deformation of the spacer, but also by the movement of the cavity as a whole due to the Doppler effect. This effect can be measured by an interferometric scheme, similar to the used for fiber noise compensation 35 , and can be cancelled by a feedback loop using. The measured fractional frequency instability caused by the Doppler effect is at the level 10 -15 at 100 ms (fig.…”

Section: Cavity Doppler Noisementioning

confidence: 99%

48 -cm-long room-temperature cavities in vertical and horizontal orientations for Sr optical clock

et al. 2021

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The development of an optical clock with ultimate accuracy and stability requires lasers with very narrow linewidth. We present two ultrastable laser systems based on 48 cm long Fabry-Perot cavities made of ULE glass in horizontal and vertical configurations operating at 698 nm. Fractional frequency instability of the beat signal between two lasers reaches 1.6•10 -15 at the averaging time of 1 s. We experimentally characterized the contribution of the different noise sources (power fluctuations, residual amplitude modulation, the Doppler noise, sensitivity to the shock impact) and found that in our case the laser frequency instability to a large extent is determined by an optoelectronic feedback loop. Although the vertical configuration proved to be easier to manufacture and to transport, it turned out that it is much more sensitive to acoustics and horizontal accelerations compared to the horizontal one. Both laser systems were transported over a 60 km distance from the Lebedev Physical Institute to the Russian National Metrology Institute (VNIIFTRI) where they serve as local oscillators for spectroscopy of the clock transition in the recently developed strontium optical clock.

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Short-haul fibre-optic communication link with a phase noise compensation system for optical frequency signal transmission

Cited by 10 publications

References 1 publication

Synchronous Comparison of Two Thulium Optical Clocks

Synchronous Comparison of Two Thulium Optical Clocks

2.8 km fiber link with phase noise compensation for transportable Yb⁺ optical clock characterization

48 -cm-long room-temperature cavities in vertical and horizontal orientations for Sr optical clock

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Short-haul fibre-optic communication link with a phase noise compensation system for optical frequency signal transmission

Cited by 10 publications

References 1 publication

Synchronous Comparison of Two Thulium Optical Clocks

Synchronous Comparison of Two Thulium Optical Clocks

2.8 km fiber link with phase noise compensation for transportable Yb+ optical clock characterization

48 -cm-long room-temperature cavities in vertical and horizontal orientations for Sr optical clock

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Product

Resources

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2.8 km fiber link with phase noise compensation for transportable Yb⁺ optical clock characterization