Challenges Due to Rayleigh Backscattering in Radio over Fibre Links for the Square Kilometre Array Radio-Telescope

Nanni, Jacopo; Giovannini, Andrea; Rusticelli, Simone; Perini, Federico; Monari, Jader; Lenzi, Enrico; Tartarini, Giovanni

doi:10.1109/icton.2019.8840161

Cited by 10 publications

(8 citation statements)

References 12 publications

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“…Similarly to what has been observed with reference to the HD pω RF,1 terms, Eq. (24) shows that for the case OM I 1 << 1, IM D uω RF,1 +vω RF,2 consists in a weighted sum of products of the squares of the Bessel Functions of first kind of orders u and v (J u and J v , respectively), for which the same quantitative considerations developed above can be applied.…”

Section: E Undesired Spurious Terms Of Particular Interestmentioning

confidence: 94%

“…Finally, note that in order to perform correctly the evaluation of equations ( 22), (24), it is necessary to take adequately small values for the average distances z k+1 − z k between two consecutive reflection sections. Through various simulation tests it has been verified that convergence to stable, reliable results can be achieved utilizing values of 10 −4 m or less.…”

Section: E Undesired Spurious Terms Of Particular Interestmentioning

confidence: 99%

“…This undesired effect must then be adequately kept under control. Its evaluation can be performed from equations (24) and ( 25), through which it is possible to evaluate, for example, the 2nd order intermodulation product between the dithering tone and the RFI tone, namely IM D ω RF,1 +ω dith , as follows:…”

Section: Proposed Countermeasure: Dithering Tonementioning

confidence: 99%

“…However, the insurgence of nonlinearities related to RB in D-IMDD RoF links has been put into evidence in relatively recent times [24]. The reason consists in the fact that its detriments can become important only in presence of particular combinations of the operating parameters of the optical system considered, which include e.g.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: E Undesired Spurious Terms Of Particular Interestmentioning

confidence: 94%

Section: E Undesired Spurious Terms Of Particular Interestmentioning

confidence: 99%

Section: Proposed Countermeasure: Dithering Tonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Nanni¹,

Giovannini²,

Hadi³

et al. 2020

Preprint

Self Cite

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“…The cause of both problems has been identified in the Rayleigh optical backscattering. 34 This effect is originated by the interaction of the emitted light by the laser and the back-reflected one by the fiber into the laser cavity itself, so basically it is strongly dependent from the optical isolator integrated in the optical source. The detriment is equally present on both the RFoF links used for X-and Y-polarization signals because of the vicinity of the two wavelengths utilized (1270 and 1330 nm, respectively).…”

Section: Mitigation Of the Detrimental Effects Due To Rayleigh Backscatteringmentioning

confidence: 99%

Radio frequency over fiber technology for SKA-low receiver

Perini

Rusticelli

Schiaffino

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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The signal reception chain is an essential element for achieving the square kilometer array-low (SKA-low) system requirements in terms of high sensitivity and dynamic range. The balance between gain, linearity, and low power consumption, as well as the cost, are fundamental parameters that influence the selection of the most suitable technology for SKA-low. Further factors, such as low self-generated radio frequency (RF) interference, high reliability, robustness under extreme environment, and last but not least, the distance between the antennas and the acquisition systems, have impacts on the selection for both architecture and receiver system design. The selected technology for the SKA-low RF signal transportation is RF-over-fiber systems, where the preamplified RF signal picked up by the antennas is carried via analogue modulation over optical fiber. The rationales behind the selection are reported, along with descriptions on the development of the receiver prototypes. The prototypes were deployed and installed on the demonstrator arrays at the selected SKA-low site in Western Australian. Particular attention has been put on the thermal characterization of the receiver system under the actual operating temperature on site, especially when both transmitting part and the optical medium are subjected to external ambient temperature variations. Performance issues encountered in the demonstrator arrays are also discussed along with some proposals for future activities.

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

Nanni

Giovannini

Hadi

et al. 2020

J. Lightwave Technol.

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Challenges Due to Rayleigh Backscattering in Radio over Fibre Links for the Square Kilometre Array Radio-Telescope

Cited by 10 publications

References 12 publications

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

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

Radio frequency over fiber technology for SKA-low receiver

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

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