Delivering the same optical frequency at two places: accurate cancellation of phase noise introduced by an optical fiber or other time-varying path

Ma, Lei; Jungner, Peter; Ye, Jun; Hall, John L.

doi:10.1364/ol.19.001777

Cited by 503 publications

(317 citation statements)

References 4 publications

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“…The technique of phase-compensated optical fiber link [1][2][3][4][5] has developed rapidly over the last decade and has enabled the transfer and comparison of optical frequencies over continental-scale distances of more than 1000 km [6][7][8][9]. Optical fiber-based clock frequency comparison is not only useful for time-frequency metrology, but can also provide a powerful experimental tool in many applications, such as test of variation of fundamental constants [10], relativistic geodesy [6], and dark matter search [11].…”

Section: Introductionmentioning

confidence: 99%

“…Optical frequency transfer by the active noise cancellation (ANC) method [1,12] has a wide range of applications, including remote high-resolution and high-accuracy spectroscopy [13][14][15], very long baseline interferometry [16], and remote narrow-linewidth light sources [2,14,17]. However, if only a comparison of the optical frequencies is required, the recently proposed two-way method [18][19][20] offers a good alternative with the advantage of simplified experimental apparatus without active components.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid fiber links for accurate optical frequency comparison

et al. 2017

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We present the experimental demonstration of a local two-way optical frequency comparison over a 43-km-long urban fiber network without any requirement for measurement synchronization. We combined the local two-way scheme with a regular active noise compensation scheme that was implemented on another parallel fiber leading to a highly reliable and robust frequency transfer. This hybrid scheme allowed us to investigate the major limiting factors of the local two-way comparison. We analyzed the contributions of the interferometers at both local and remote locations to the phase noise of the local two-way signal. Using the ability of this setup to be injected by either a single laser or two independent lasers, we measured the contributions of the demodulated laser instabilities to the long-term instability. We show that a fractional frequency instability level of 10^-20 at 10000 s can be obtained using this simple setup after propagation over a distance of 43 km in an urban area

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid fiber links for accurate optical frequency comparison

et al. 2017

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“…The fiber-induced phase-noise is sensed and removed using a method [11] similar to that described in Ref. [15]. Finally, the frequency of the 563 nm light is referenced to the electric-quadrupole transition by first frequency-shifting in an acousto-optic modulator (AOM) and then frequency-doubling in a single pass through a deuterated ammonium dihydrogen phosphate crystal.…”

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confidence: 99%

Sub-dekahertz Ultraviolet Spectroscopy of199Hg+

et al. 2000

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Using a laser that is frequency-locked to a FabryPérotétalon of high finesse and stability, we probe the 5d 10 6s 2 S 1/2 (F=0)↔5d 9 6s 2 2 D 5/2 (F=2) ∆mF =0 electricquadrupole transition of a single laser-cooled 199 Hg + ion stored in a cryogenic radio-frequency ion trap. We observe Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm (1.06 × 10 15 Hz), yielding a line Q ≈ 1.6 × 10 14 . We perform a preliminary measurement of the 5d 9 6s 2 2 D 5/2 electric-quadrupole shift due to interaction with the static fields of the trap, and discuss the implications for future trapped-ion optical frequency standards. PACS numbers: 06.30. Ft, 32.30.Jc, 32.80.Pj, 42.62.Fi Precision spectroscopy has held an enduring place in physics, particularly in the elucidation of atomic structure and the measurement of fundamental constants, in the development of accurate clocks, and for fundamental tests of physical laws. Two ingredients of paramount importance are high accuracy, that is, the uncertainty in systematic frequency shifts must be small, and high signal-to-noise ratio, since the desired measurement precision must be reached in a practical length of time. In this paper, we report the measurement of an optical absorption line in a single laser-cooled 199 Hg + ion at a frequency ν 0 = 1.06 × 10 15 Hz (wavelength ≈ 282 nm) for which a linewidth ∆ν = 6.7 Hz is observed, yielding the highest Q ≡ ν 0 /∆ν ever achieved for optical (or lower frequency) spectroscopy. We also report a preliminary measurement of the interaction of the upper state electric-quadrupole moment with the static field gradients of the ion trap, which is expected to contribute the largest uncertainty for a frequency standard based on this system.In spectroscopy and for clocks, fluctuations in frequency measurement are usually expressed fractionally: σ y (τ ) = ∆ν meas (τ )/ν 0 , where τ is the total measurement time. When the stability is limited by quantum fluctuations in state detection,2 , where N is the number of atoms, τ probe is the transition probe time (typically limited by the excited-state lifetime or the stability of the local oscillator), and C is a constant of order unity that depends on the method of interrogation. For many decades, the highest accuracies and the greatest stabilities have been achieved by locking a microwave oscillator to a hyperfine transition in an atomic ground state [1][2][3][4][5]. Since the fractional instability σ y (τ ) is inversely proportional to the transition frequency, greater stability can be attained using transitions at higher frequencies such as those in the optical region of the electromagnetic spec-

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“…The first reported solution to this problem appeared in the mid-90s with the so-called "Doppler cancellation scheme" [38]. Figure 1 depicts the operation principle of a stabilized fibre link [39].…”

Section: Optical Carrier Phase Fibre Link For Frequency Metrology: Prmentioning

confidence: 99%

Frequency and time transfer for metrology and beyond using telecommunication network fibres

Lopez

Kéfélian

Jiang

et al. 2015

Comptes Rendus. Physique

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The distribution and the comparison of an ultra-stable optical frequency and accurate time using optical fibres have been greatly improved in the last ten years. The frequency stability and accuracy of optical links surpass well-established methods using the global navigation satellite system and geostationary satellites. In this paper, we present a review of the methods and the results obtained. We show that public telecommunication network carrying Internet data can be used to compare and distribute ultra-stable metrological signals over long distances. This novel technique paves the way for the deployment of a national and continental ultra-stable metrological optical network. RésuméLa distribution et la comparaison d'étalons de fréquence optique ultra-stables et d'échelle de temps ont été grandement améliorées depuis dix ans par l'emploi de fibres optiques. La stabilité de fréquence et l'exactitude des liens optiques fibrés surpassent les méthodes bien établies fondées sur les communications satellitaires. Dans cet article, nous présentons les méthodes et les résultats obtenus pendant cette décade. Nous montrons que les réseaux de télécommunication publics transportant des données internet peuvent être utilisés pour comparer et distribuer des signaux métrologiques sur de grandes distances. Ceci ouvre la voie au déploiement d'un réseau métrologique à l'échelle nationale et continentale.

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Delivering the same optical frequency at two places: accurate cancellation of phase noise introduced by an optical fiber or other time-varying path

Cited by 503 publications

References 4 publications

Hybrid fiber links for accurate optical frequency comparison

Hybrid fiber links for accurate optical frequency comparison

Sub-dekahertz Ultraviolet Spectroscopy of199Hg+

Frequency and time transfer for metrology and beyond using telecommunication network fibres

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