Optical-fiber pulse rate multiplier for ultralow phase-noise signal generation

Haboucha, Adil; Zhang, Wei; Li, T.; Lours, M.; Luiten, André; Coq, Yann Le; Santarelli, Giorgio

doi:10.1364/ol.36.003654

Cited by 134 publications

(78 citation statements)

References 21 publications

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“…We expect to reach the 10 −16 level of accuracy in the near future with commercially available ground stations modified to apply the TWCP technique. Optically generated microwaves [25,26] …”

Section: Figmentioning

confidence: 99%

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Hachisu¹,

Fujieda²,

Nagano³

et al. 2014

Opt. Lett.

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We have demonstrated a direct frequency comparison between two 87 Sr lattice clocks operated in intercontinentally separated laboratories in real time. Two-way satellite time and frequency transfer technique based on the carrier phase was employed for a direct comparison with a baseline of 9 000 km between Japan and Germany. A frequency comparison was achieved for 83 640 s resulting in a fractional difference of (1.1 ± 1.6) × 10 −15 , where the statistical part is the biggest contribution to the uncertainty. This measurement directly confirms the agreement of the two optical frequency standards on an intercontinental scale.

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Section: Figmentioning

confidence: 99%

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Hachisu¹,

Fujieda²,

Nagano³

et al. 2014

Opt. Lett.

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“…It should be possible to improve both by utilizing a higher repetition rate optical source. Modest reprate enhancement (up to few GHz) can be accomplished using compact mode-locked lasers [27], [28], or by employing an optical pulse interleaver [29]. Moving beyond a few GHz, one can utilize optoelectronic combs [30], [31], which provide additional flexibility in choice of center frequency, bandwidth, and repetition rate.…”

Section: Discussionmentioning

confidence: 99%

Photonic-Assisted Error-Free Wireless Communication With Multipath Precompensation Covering 2–18 GHz

Weiner

2016

J. Lightwave Technol.

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Abstract-A wireless communication experiment that uses photonic-assisted radio-frequency arbitrary waveform generation (RF-AWG) for precompensation of multipath distortion over a 2-18 GHz frequency band is reported. Photonic-assisted RF-AWG is used both for spread spectrum sounding of the multipath channel and for synthesis of precompensation waveforms that yield pulse compression and distortion suppression at the receiver. By directly encoding the precompensated waveforms in optical hardware, 250 Mbit/s error-free data transmission is achieved experimentally in binary-phase-shift-keying format. For the first time to our knowledge, phase compensation and time reversal precompensation techniques are compared in hardware encoded data transmission experiments; our results confirm predictions that phase compensation outperforms time reversal under intersymbol interference limited conditions. Index Terms-Microwave communications, multipath channel, optical pulse shaping.

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“…We have realized proof-of-principle experiments of such a scheme [37] and are now progressing toward implementing it in an operational system. We further demonstrated several advanced techniques [38][39][40] to reduce the imperfection of the frequency division and photo-detection processes. We have shown that it is now becoming possible to generate microwave signals with phase noise as low or lower than any other technology for a large range of Fourier frequencies.…”

Section: Optical Frequency Combsmentioning

confidence: 99%

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Abgrall

Chupin

Sarlo

et al. 2015

Comptes Rendus. Physique

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In this article, we report on the work done with the LNE-SYRTE atomic clock ensemble during the last 10 years. We cover progress made in atomic fountains and in their application to timekeeping. We also cover the development of optical lattice clocks based on strontium and on mercury. We report on tests of fundamental physical laws made with these highly accurate atomic clocks. We also report on work relevant to a future possible redefinition of the SI second. IntroductionResearch on highly accurate atomic frequency standards and their applications is making fast and steady progress. The quest for ever increased accuracy is advancing hand in hand with advances in quantum physics, with better understanding and manipulation of atomic systems, with exploration of fundamental laws of nature and with the development of important services and infrastructures for science and society. The quest for increased accuracy is also a powerful incentive to innovation in such areas as lasers, laser stabilization, low noise electronics, stable oscillators, low noise detection of optical signals, fiber devices and cold-atom based instrumentation for ground or space applications. Finally, in addition to enhancing existing applications, improved accuracy leads to new applications.This article focuses on key achievements and trends of the last 10 years. Over this period of time, the first generation of laser-cooled standards, using the atomic fountain geometry, reached maturity and had large impact on international timekeeping. The typical accuracy of these frequency standards, 2 parts in 10 16 , is now permanently accessible both locally and globally. At the same time, a new generation of optical clocks showed tremendous and steady improvement, gaining more than two orders of magnitude in a decade. To date, an accuracy of 6.4 × 10 −18 [1] was reported. Similarly, major improvements occurred in many other aspects of optical frequency metrology, notably in optical frequency combs and optical fiber links.In this article, we will report on developments of the LNE-SYRTE atomic clock ensemble since our 2004 report in the Special Issue of the Comptes Rendus de l'Académie des sciences on Fundamental Metrology [2]. This work exemplifies many of the above mentioned features of research on highly accurate atomic frequency standards. We will focus on frequency standards and their impact on timescales and timekeeping, on clock comparisons, including optical-to-microwave comparisons with combs, and their applications. Several

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Optical-fiber pulse rate multiplier for ultralow phase-noise signal generation

Cited by 134 publications

References 21 publications

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Photonic-Assisted Error-Free Wireless Communication With Multipath Precompensation Covering 2–18 GHz

Atomic fountains and optical clocks at SYRTE: Status and perspectives

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