Active Propagation Delay Stabilization for Fiber-Optic Frequency Distribution Using Controlled Electronic Delay Lines

Śliwczyński, Ł.; Krehlik, P.; Buczek, Ł.; Lipiński, Marek

doi:10.1109/tim.2010.2090696

Cited by 72 publications

(42 citation statements)

References 39 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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“…(For more detailed analysis and discussion, seé Sliwczyński et al 2011.) The typical stability of the 10 MHz frequency transfer is shown in Fig.…”

Section: Fibre Optic Distribution Of Frequency and Timementioning

confidence: 99%

Fibre-optic delivery of time and frequency to VLBI station

Krehlik

Buczek

Kołodziej

et al. 2017

A&A

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The quality of Very Long Baseline Interferometry (VLBI) radio observations predominantly relies on precise and ultra-stable time and frequency (T&F) standards, usually hydrogen masers (HM), maintained locally at each VLBI station. Here, we present an operational solution in which the VLBI observations are routinely carried out without use of a local HM, but using remote synchronization via a stabilized, long-distance fibre-optic link. The T&F reference signals, traceable to international atomic timescale (TAI), are delivered to the VLBI station from a dedicated timekeeping laboratory. Moreover, we describe a proof-of-concept experiment where the VLBI station is synchronized to a remote strontium optical lattice clock during the observation.

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“…After calibration, the measurement setup has been used to research the low-frequency response of the dedicated T&F Transfer System TFTS-2 developed in our laboratory [8,9]. A general block diagram of the T&F transfer system TFTS-2 is shown in Fig.…”

Section: Tests With the Tandf Transfer System Tfts-2mentioning

confidence: 99%

“…When the loop (DLL) is locked, the system tracks and stabilizes the time delay between the Local Module input and the Remote Module output. The primary task of the system was to compensate the thermal fluctuation of time delay in the fiber, but − by the way − the loop compensates also the low-frequency noise generated in the fiber [8,10].…”

Section: Tests With the Tandf Transfer System Tfts-2mentioning

confidence: 99%

Testing Time and Frequency Fiber-Optic Link Transfer by Hardware Emulation of Acoustic-Band Optical Noise

Lipiński

Krehlik

Śliwczyński

et al. 2016

Metrology and Measurement Systems

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The low-frequency optical-signal phase noise induced by mechanical vibration of the base occurs in field-deployed fibers. Typical telecommunication data transfer is insensitive to this type of noise but the phenomenon may influence links dedicated to precise Time and Frequency (T&F) fiber-optic transfer that exploit the idea of stabilization of phase or propagation delay of the link. To measure effectiveness of suppression of acoustic noise in such a link, a dedicated measurement setup is necessary. The setup should enable to introduce a low-frequency phase corruption to the optical signal in a controllable way. In the paper, a concept of a setup in which the mechanically induced acoustic-band optical signal phase corruption is described and its own features and measured parameters are presented. Next, the experimental measurement results of the T&F transfer TFTS-2 system's immunity as a function of the fibre-optic length vs. the acoustic-band noise are presented. Then, the dependency of the system immunity on the location of a noise source along the link is also pointed out.

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Active Propagation Delay Stabilization for Fiber-Optic Frequency Distribution Using Controlled Electronic Delay Lines

Cited by 72 publications

References 39 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

Fibre-optic delivery of time and frequency to VLBI station

Testing Time and Frequency Fiber-Optic Link Transfer by Hardware Emulation of Acoustic-Band Optical Noise

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