Stable Photonic Links for Frequency and Time Transfer in the Deep-Space Network and Antenna Arrays

Calhoun, M.; Huang, Sheng; Tjoelker, R. L.

doi:10.1109/jproc.2007.905048

Cited by 126 publications

(51 citation statements)

References 12 publications

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“…Cette compensation active du bruit de transmission est réalisée grâce à la mesure du signal après un aller-retour dans la fibre. Dans les premières applications, une fréquence radio (RF) ou micro-onde -facilement raccordable à l'étalon primaire de fréquence -était transmise sous la forme d'une modulation d'amplitude de la porteuse optique [13,14]. Nous avons ainsi obtenu un transfert de fréquences RF et microondes avec une stabilité de 10 −15 sur une durée de 1 s et de 10 −18 sur une journée.…”

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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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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“…Synchronization is vital for very large baseline interferometry application. Successful stable time and frequency signals sent over optical¯bers (Calhoun et al, 2007) of 4.6 km (Mullavey et al, 2010, 20 km (Baldwin et al, 2012) and 100 km (Wang et al, 2014) have been reported.…”

Section: Introductionmentioning

confidence: 98%

Simultaneous Signal Amplification and Clock Distribution Employing Backward Raman Pump Over an Optical Fiber for Applications Such as Square Kilometer Array

Kipnoo

Gamatham²,

Leitch

et al. 2017

J. Astron. Instrum.

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For the first time to our knowledge, we experimentally demonstrate a clock signal transmission using a counter-propagating Raman pump as a transmitter and concurrently utilize the same pump to amplify a data signal. A 1548[Formula: see text]nm vertical cavity surface emitting laser (VCSEL) was modulated with a pseudorandom bit sequence (2[Formula: see text]) and coupled into an optical fiber. A 1448[Formula: see text]nm Raman pump in the backward scheme was also modulated with a 10[Formula: see text]kHz clock and used to boost the VCSEL data signal so as to improve the reach of the transmission. Clock distribution in a telescope network such as the Square Kilometre Array (SKA) is essential for the proper operation of the digitizers as well as dish synchronization. In the SKA phase 1, long transmissions involving baselines extending up to 100[Formula: see text]km may need amplification. We propose the use of counter-Raman configuration to amplify the signal carrying received astronomical data while transmitting a clock to the receptors. This is a cost-effective bi-directional transmission suited for telescope network applications.

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“…Distributing local oscillator (LO) signals to remote antennas with highly stabilized and coherent phases is desired in many applications, especially in multi-antenna array systems, such as phasedarray radar and connected-element interferometry [1]. In order to achieve unprecedented sensitivity and angular resolution, stable LO signals need to be delivered to different antennas ranging from hundred meters to tens of kilometers to coherently down-convert the received radio frequency (RF) signals [2].…”

Section: Introductionmentioning

confidence: 99%

Phase-Stabilized Delivery for Multiple Local Oscillator Signals via Optical Fiber

et al. 2014

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In this paper, we propose and demonstrate a multiple local oscillator (LO) signal phase stabilization technique for long-distance fiber delivery. One of the LO signals, which acts as a reference single, is round-trip transferred between the central station and the remote end, carrying the phase variation arises from perturbations of the fiber link. The wavelength of the optical carrier is adjusted according to the phase variation of the reference LO, to stabilize the delay of the fiber link. Once the delay of the link is stabilized, the phases of other LO signals that transferred through the same fiber link will all be stabilized. Meanwhile, the delay tunable range is in proportion to the fiber length, which means a very long delivery distance can be expected. Experimentally, LOs at frequencies of 2.46 GHz and 8 GHz are transferred through a 30-km fiber link, and significant phase drift compression is observed at both frequencies.

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Stable Photonic Links for Frequency and Time Transfer in the Deep-Space Network and Antenna Arrays

Cited by 126 publications

References 12 publications

Transfert de fréquence par fibre optique en métrologie

Transfert de fréquence par fibre optique en métrologie

Simultaneous Signal Amplification and Clock Distribution Employing Backward Raman Pump Over an Optical Fiber for Applications Such as Square Kilometer Array

Phase-Stabilized Delivery for Multiple Local Oscillator Signals via Optical Fiber

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