Coherent microwave transfer over a 204-km telecom fiber link by a cascaded system

Fujieda, Miho; Kumagai, Michio; Nagano, S.

doi:10.1109/tuffc.2010.1394

Cited by 73 publications

(42 citation statements)

References 19 publications

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“…Many groups [1,[8][9][10][11][12][13][14][15][16][17], have achieved RF-frequency transfer over fiber-optic distances of at least 50 km, using amplitude modulation to encode a RF signal onto the optical carrier; the transfer stability and precision attained are better than those of the best conventional methods based on the GPS satellite system (i.e., a fractional frequency stability of ~10…”

Section: Introductionmentioning

confidence: 99%

“…In order to attain the highest-possible stability, there is a need to address the effect of fluctuations in the optical-fiber path length (e.g., due to temperature changes or mechanical vibrations). The most commonly used remedy is to measure the round-trip phase and then to suppress the effect of phase fluctuations by either actively altering the fiber length [1,8-10, [13][14][15] or indirectly by electronically pre-compensating the outgoing signal phase/frequency [1,8,9,11,12,16,17,19,20]. In the latter case, the principle of phase conjugation is sometimes used to adjust the outgoing signal phase [1,8,11,17,21,22].…”

Section: Introductionmentioning

confidence: 99%

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Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing

He¹,

Orr²,

Baldwin³

et al. 2013

Opt. Express

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OSA grants to the Author(s) (or their employers, in the case of works made for hire) the following rights:(a) The right, after publication by OSA, to use all or part of the Work without revision or modification, including the OSAformatted version, in personal compilations or other publications consisting solely of the Author(s') own works, including the Author(s') personal web home page, and to make copies of all or part of the Work for the Author(s') use for lecture or classroom purposes; (b) The right to post and update his or her Work on any internet site (other than the Author(s') personal web home page) provided that the following conditions are met: (i) access to the server does not depend on payment for access, subscription or membership fees; and (ii) any such posting made or updated after acceptance of the Work for publication includes and prominently displays the correct bibliographic data and an OSA copyright notice (e.g. "© 2009 The Optical Society").. Abstract: We demonstrate long-distance (100-km) synchronization of the phase of a radio-frequency reference over an optical-fiber network without needing to actively stabilize the optical path length. Frequency mixing is used to achieve passive phase-conjugate cancellation of fiber-length fluctuations, ensuring that the phase difference between the reference and synchronized oscillators is independent of the link length. The fractional radio-frequency-transfer stability through a 100-km "real-world" urban optical-fiber network is 6 × 10 17 with an averaging time of 10 4 s. Our compensation technique is robust, providing long-term stability superior to that of a hydrogen maser. By combining our technique with the short-term stability provided by a remote, high-quality quartz oscillator, this system is potentially applicable to transcontinental optical-fiber time and frequency dissemination where the optical round-trip propagation time is significant. 723-727 (2010). 14. G. Marra, H. S. Margolis, S. N. Lea, and P. Gill, "High-stability microwave frequency transfer by propagation of an optical frequency comb over 50 km of optical fiber," Opt. Lett. 35(7), 1025-1027 (2010). 15. G. Marra, R. Slavík, H. S. Margolis, S. N. Lea, P. Petropoulos, D. J. Richardson, and P. Gill, "High-resolution microwave frequency transfer over an 86-km-long optical fiber network using a mode-locked laser," Opt. Lett. ©2013 Optical Society of America 36(4),

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing

He¹,

Orr²,

Baldwin³

et al. 2013

Opt. Express

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“…Sometimes, the dissemination of frequency alone is sufficient for applications such as the comparison of atomic frequency standards between different research laboratories56 and the comparison of definitions of relevant physical constants (e.g., metre, candela and ampere). Throughout the past decade, different frequency dissemination schemes based on fibre links have been proposed and demonstrated, including optical frequency dissemination789101112, microwave frequency dissemination131415161718, optical frequency comb dissemination1920 and the recently reported all-digital radio-frequency dissemination21.…”

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confidence: 99%

Precise and Continuous Time and Frequency Synchronisation at the 5×10-19 Accuracy Level

Wang

Gao

Chen

et al. 2012

Sci Rep

214

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The synchronisation of time and frequency between remote locations is crucial for many important applications. Conventional time and frequency dissemination often makes use of satellite links. Recently, the communication fibre network has become an attractive option for long-distance time and frequency dissemination. Here, we demonstrate accurate frequency transfer and time synchronisation via an 80 km fibre link between Tsinghua University (THU) and the National Institute of Metrology of China (NIM). Using a 9.1 GHz microwave modulation and a timing signal carried by two continuous-wave lasers and transferred across the same 80 km urban fibre link, frequency transfer stability at the level of 5×10−19/day was achieved. Time synchronisation at the 50 ps precision level was also demonstrated. The system is reliable and has operated continuously for several months. We further discuss the feasibility of using such frequency and time transfer over 1000 km and its applications to long-baseline radio astronomy.

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“…Nos résultats novateurs ont stimulé le développement de liens optiques dans les autres laboratoires de métro-logie (essentiellement aux Etats-Unis, en Allemagne, en Angleterre, en Italie et au Japon) [19,20]. La recherche s'est alors orientée vers la mise en oeuvre de liens de longues distances, afin de démontrer une réelle alternative aux liens satellitaires.…”

Section: Principe Du Transfert De Fréquence Par Fibre Optiqueunclassified

Transfert de fréquence par fibre optique en métrologie

Santarelli¹,

Lopez²,

Kéfélian³

et al. 2014

R. franç. métrol.

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RésuméL'utilisation de la fibre optique pour la comparaison et la distribution de références ultrastables de fréquence s'est fortement développée ces dix dernières années. Le LNE-SYRTE et le LPL sont des laboratoires pionniers dans l'étude et le développement de ces techniques. La stabilité de fréquence et l'exactitude des liens optiques fibrés surpassent désormais les performances des méthodes classiques qui exploitent les satellites GPS ou géostationnaires. Dans cet article nous présentons une revue des méthodes et des résultats obtenus. Nous montrons également qu'il est possible d'utiliser les réseaux fibrés de l'internet pour réali-ser la comparaison et la distribution des signaux métrologiques ultrastables sur de longues distances. La stabilité et l'exactitude de tels liens sur réseaux fibrés de l'internet sont aujourd'hui proches des limites que l'on peut attendre sur une fibre optique dédiée à cette application. Cette nouvelle technique ouvre la voie au déploiement au niveau national et international d'un réseau optique métrologique ultrastable. MOTS CLÉS : TEMPS, FRÉQUENCE, LIEN OPTIQUE FIBRÉ, LASER STABLE. AbstractThe distribution and the comparison of an ultrastable reference frequency using optical fibres have been greatly improved in the last ten years.

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Coherent microwave transfer over a 204-km telecom fiber link by a cascaded system

Cited by 73 publications

References 19 publications

Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing

Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing

Precise and Continuous Time and Frequency Synchronisation at the 5×10-19 Accuracy Level

Transfert de fréquence par fibre optique en métrologie

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