Stable transmission of radio frequency signals on fiber links using interferometric delay sensing

Wilcox, Russell; Byrd, J.; Doolittle, Lawrence; Huang, Gang; Staples, J.

doi:10.1364/ol.34.003050

Cited by 58 publications

(45 citation statements)

References 8 publications

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“…Supersonic expansion of nitrogen with a backing pressure of 3 bar through a 100 µm diameter nozzle and a 200 µm diameter skimmer produced a molecular beam. The target volume contained a nearly uniform molecular density of ~10 13 cm −3 and the target gas had a rotational temperature of approximately 20 K. The 800 nm laser pulse used to align the molecular gas had a pulse energy of ~400 µJ, a repetition rate of 360 Hz, and a duration of ~60 fs in a quasi-flat top pulse, which was measured by autocorrelation after the experimental run. It was not possible to obtain direct optical autocorrelation information at the interaction region during the run.…”

Section: Experiments and Resultsmentioning

confidence: 99%

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Time-resolved pump-probe experiments at the LCLS

et al. 2010

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Abstract:The first time-resolved x-ray/optical pump-probe experiments at the SLAC Linac Coherent Light Source (LCLS) used a combination of feedback methods and post-analysis binning techniques to synchronize an ultrafast optical laser to the linac-based x-ray laser. Transient molecular nitrogen alignment revival features were resolved in time-dependent x-rayinduced fragmentation spectra. These alignment features were used to find the temporal overlap of the pump and probe pulses. The strong-field dissociation of x-ray generated quasi-bound molecular dications was used to establish the residual timing jitter. This analysis shows that the relative arrival time of the Ti:Sapphire laser and the x-ray pulses had a distribution with a standard deviation of approximately 120 fs. The largest contribution to the jitter noise spectrum was the locking of the laser oscillator to the reference RF of the accelerator, which suggests that simple technical improvements could reduce the jitter to better than 50 fs. ©2010 Optical Society of America

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Section: Experiments and Resultsmentioning

confidence: 99%

“…The optical laser is synchronized by a stabilized fiber optic timing system described in Ref [13]. This system locks a mode-locked Ti:Sapphire oscillator to the 476 MHz RF reference derived from resonant RF cavities.…”

Section: Timing the Lasermentioning

confidence: 99%

Time-resolved pump-probe experiments at the LCLS

et al. 2010

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“…Thus, it is the recommended reference signal and is the frequency that has been used in these studies. Ongoing research also indicates that 1 GHz signals can be synthesized with even less degradation and such reference signals can now be transmitted over long distances with fiber techniques (e.g., Wilcox et al 2009). Thus the time standards no longer need to be on-site.…”

Section: Possible Improvement Of Cso Time Standardsmentioning

confidence: 99%

The Impact of Frequency Standards on Coherence in Vlbi at the Highest Frequencies

Rioja

Dodson

Asaki

et al. 2012

The Astronomical Journal

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We have carried out full imaging simulation studies to explore the impact of frequency standards in millimeter and submillimeter very long baseline interferometry (VLBI), focusing on the coherence time and sensitivity. In particular, we compare the performance of the H-maser, traditionally used in VLBI, to that of ultra-stable cryocooled sapphire oscillators over a range of observing frequencies, weather conditions, and analysis strategies. Our simulations show that at the highest frequencies, the losses induced by H-maser instabilities are comparable to those from high-quality tropospheric conditions. We find significant benefits in replacing H-masers with cryocooled sapphire oscillator based frequency references in VLBI observations at frequencies above 175 GHz in sites which have the best weather conditions; at 350 GHz we estimate a 20%-40% increase in sensitivity over that obtained when the sites have H-masers, for coherence losses of 20%-10%, respectively. Maximum benefits are to be expected by using co-located Water Vapor Radiometers for atmospheric correction. In this case, we estimate a 60%-120% increase in sensitivity over the H-maser at 350 GHz.

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“…This number is larger than that reported in ref. 4 for a similar fiber length because in that case both receivers were in the same enclosure and shared components. The 300m fiber loop included several flat-polished connectors, which may contribute to short-term error by adding unwanted optical signals in phase with the main signal.…”

Section: Ojivco Signalmentioning

confidence: 99%

Phase Stable RF-over-fiber Transmission using Heterodyne Interferometry

Wilcox

Byrd

Doolittle

et al. 2010

National Fiber Optic Engineers Conference

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We demonstrate stable transmission of 3GHz over 300m of fiber with less than 0.017 degree (17fs) RMS phase error. An interferometer measures optical phase delay, providing information to a feed-forward correction of RF phase. ©2010 Optical Society of America OC1S codes: (060 5625) Radio frequency photonics, (060.2360) Fiber optic links and subsystems 1. Introduction New scientific applications require phase-stabilized RF distribution to multiple remote locations. These include phased-array radio telescopes [1] and short pulse free electron lasers [2]. RF modulated onto a CW optical carrier and transmitted via fiber is capable of low noise, but commercially available systems aren't long term stable enough for these applications. Typical requirements are for less than 50fs long term temporal stability between receivers, which is 0.05 degrees at 3GHz. Good results have been demonstrated for RF distribution schemes based on transmission of short pulses [3], but these require specialized free-space optics and high stability mechanical infrastructure. We report a method which uses only standard telecom optical and RF components, and achieves less than 20fs RMS error over 300m of standard single-mode fiber.

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Stable transmission of radio frequency signals on fiber links using interferometric delay sensing

Cited by 58 publications

References 8 publications

Time-resolved pump-probe experiments at the LCLS

Time-resolved pump-probe experiments at the LCLS

The Impact of Frequency Standards on Coherence in Vlbi at the Highest Frequencies

Phase Stable RF-over-fiber Transmission using Heterodyne Interferometry

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