A Radio-Frequency-over-Fiber link for large-array radio astronomy applications

Mena, Juan; Bandura, Kevin; Cliche, J. F.; Dobbs, M.; Gilbert, A.; Tang, Q. Y.

doi:10.1088/1748-0221/8/10/t10003

Cited by 23 publications

(10 citation statements)

References 21 publications

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“…This is achieved using an hydrogen maser clock with a short time stability of 10 −15 (Allan Variance). With a locally developed RF-Over-Fiber device (Mena et al 2013), we receive the 10 MHz signal from the AGGO's hydrogen maser using a fiber optic cable that connects both institutions. This signal is used to synchronize a test unit back-end with the aim to compare results from the different time bases used at the moment.…”

Section: Clock Synchronizationmentioning

confidence: 99%

Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy

Gancio

Lousto

Combi

et al. 2020

A&A

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Context. The Argentine Institute of Radio astronomy (IAR) is equipped with two single-dish 30 m radio antennas capable of performing daily observations of pulsars and radio transients in the southern hemisphere at 1.4 GHz. Aims. We aim to introduce to the international community the upgrades performed and to show that IAR observatory has become suitable for investigations in numerous areas of pulsar radio astronomy, such as pulsar timing arrays, targeted searches of continuous gravitational waves sources, monitoring of magnetars and glitching pulsars, and studies of short time scale interstellar scintillation. Methods. We refurbished the two antennas at IAR to achieve high-quality timing observations. We gathered more than 1 000 hours of observations with both antennas to study the timing precision and sensitivity they can achieve. Results. We introduce the new developments for both radio telescopes at IAR. We present observations of the millisecond pulsar J0437−4715 with timing precision better than 1 µs. We also present a follow-up of the reactivation of the magnetar XTE J1810-197 and the measurement and monitoring of the latest (Feb. 1st. 2019) glitch of the Vela pulsar (J0835-4510).Conclusions. We show that IAR is capable of performing pulsar monitoring in the 1.4 GHz radio band for long periods of time with a daily cadence. This opens the possibility of pursuing several goals in pulsar science, including coordinated multi-wavelength observations with other observatories. In particular, observations of the millisecond pulsar J0437−4715 will increase the gravitational wave sensitivity of the NANOGrav array in their current blind spot. We also show IAR's great potential for studying targets of opportunity and transient phenomena such as magnetars, glitches, and fast-radio-burst sources.

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Section: Clock Synchronizationmentioning

confidence: 99%

Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy

Gancio

Lousto

Combi

et al. 2020

A&A

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“…This system has been developed, tested in the lab, and a prototype set was deployed and tested on CHIME. 38…”

Section: Amplificationmentioning

confidence: 99%

HIRAX: a probe of dark energy and radio transients

et al. 2016

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The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a new 400-800 MHz radio interferometer under development for deployment in South Africa. HIRAX will comprise 1024 six meter parabolic dishes on a compact grid and will map most of the southern sky over the course of four years. HIRAX has two primary science goals: to constrain Dark Energy and measure structure at high redshift, and to study radio transients and pulsars. HIRAX will observe unresolved sources of neutral hydrogen via their redshifted 21-cm emission line ('hydrogen intensity mapping'). The resulting maps of large-scale structure at redshifts 0.8-2.5 will be used to measure Baryon Acoustic Oscillations (BAO). BAO are a preferential length scale in the matter distribution that can be used to characterize the expansion history of the Universe and thus understand the properties of Dark Energy. HIRAX will improve upon current BAO measurements from galaxy surveys by observing a larger cosmological volume (larger in both survey area and redshift range) and by measuring BAO at higher redshift when the expansion of the universe transitioned to Dark Energy domination. HIRAX will complement CHIME, a hydrogen intensity mapping experiment in the Northern Hemisphere, by completing the sky coverage in the same redshift range. HIRAX's location in the Southern Hemisphere also allows a variety of cross-correlation measurements with large-scale structure surveys at many wavelengths. Daily maps of a few thousand square degrees of the Southern Hemisphere, encompassing much of the Milky Way galaxy, will also open new opportunities for discovering and monitoring radio transients. The HIRAX correlator will have the ability to rapidly and efficiently detect transient events. This new data will shed light on the poorly understood nature of fast radio bursts (FRBs), enable pulsar monitoring to enhance long-wavelength gravitational wave searches, and provide a rich data set for new radio transient phenomena searches. This paper discusses the HIRAX instrument, science goals, and current status.

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“…−66 dB m and HD 3ω RF,1 −90 dB m , which means OIP 2 0 dB m and OIP 3 −5 dB m according to equations (32) and (33).…”

Section: Experimental Validation Of the Model Presented And Of The Co...mentioning

confidence: 99%

Controlling Rayleigh-Backscattering-Induced Distortion in Radio over Fiber Systems for Radioastronomic Applications

Nanni¹,

Giovannini²,

Hadi³

et al. 2020

Preprint

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Radio over Fiber (RoF) Systems exploiting a direct modulation of the laser source are presently utilized within important Radioastronomic scenarios. Due to the particular operating conditions of some of these realizations, the phenomena which typically generate nonlinearities in RoF links for telecommunications applications can be here regarded as substantially harmless. However, these same operating conditions can make the RoF systems vulnerable to different kinds of nonlinear effects, related to the influence of the Rayleigh Backscattered signal on the transmitted one. A rigorous description of the phenomenon is performed, and an effective countermeasure to the problem is proposed and demonstrated, both theoretically and experimentally.

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A Radio-Frequency-over-Fiber link for large-array radio astronomy applications

Cited by 23 publications

References 21 publications

Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy

Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy

HIRAX: a probe of dark energy and radio transients

Controlling Rayleigh-Backscattering-Induced Distortion in Radio over Fiber Systems for Radioastronomic Applications

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