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

Nanni, Jacopo; Giovannini, Andrea; Hadi, Muhammad Usman; Lenzi, Enrico; Rusticelli, Simone; Wayth, R. B.; Perini, Federico; Monari, Jader; Tartarini, Giovanni

doi:10.1109/jlt.2020.2993203

Cited by 16 publications

(7 citation statements)

References 35 publications

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“…Despite their benefits, such as minimal electromagnetic intrusions, lower loss rates and larger bandwidth, RoF links suffer from channel and linear distortions caused by system components, which can be rectified using linearization methods [4][5][6][7][8][9]. Analog radio over fibre (A-RoF) [1][2][3][4][5][6][7][8][9][10], digital radio over fibre (D-RoF) [11,12] and sigma delta radio over fibre (S-DRoF) [13][14][15][16][17] are all different types of RoF implementations.…”

Section: Motivationmentioning

confidence: 99%

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Hadi

Song

Kumar

et al. 2022

Telecom

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This article describes a novel experimental study considering a multiband fibre–wireless system for constructing the transport network for fifth-generation (5G) networks. This study describes the development and testing of a 5G new radio (NR) multi-input multi-output (MIMO) hybrid fibre–wireless (FiWi) system for enhanced mobile broadband (eMBB) using digital pre-distortion (DPD). Analog radio over fibre (A-RoF) technology was used to create the optical fronthaul (OFH) that includes a 3 GHz supercell in a long-range scenario as well as a femtocell scenario using the 20 GHz band. As a proof of concept, a Mach Zehnder modulator with two independent radio frequency waveforms modifies a 1310 nm optical carrier using a distributed feedback laser across 10 km of conventional standard single-mode fibre. It may be inferred that a hybrid FiWi-based MIMO-enabled 5G NR system based on OFH could be a strong competitor for future mobile haul applications. Moreover, a convolutional neural network (CNN)-based DPD is used to improve the performance of the link. The error vector magnitude (EVM) performance for 5G NR bands is predicted to fulfil the Third Generation Partnership Project’s (3GPP) Release 17 standards.

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Section: Motivationmentioning

confidence: 99%

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Hadi

Song

Kumar

et al. 2022

Telecom

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“…, 6 in the figure) corresponds to the linear relationship I i = 10 n rad K f,i f i . This is the behavior of |M i | when i = RF is considered, since the undesired RFI signals which affect radioastronomic plants operating in the lower bandwidth of the radioastronomic spectrum exhibit frequencies of tens to hundreds of MHz [16].…”

Section: B Re-injected Portion Of the Rb Field And Effect On The Chir...mentioning

confidence: 99%

“…In a previous work, an appropriate cost-effective solution has been demonstrated, consisting in the introduction of a dithering tone as a further modulation current for the optical transmitter, which pushes the level of the nonlinear terms below the noise floor [15], [16].…”

mentioning

confidence: 99%

Optimal Configuration Mitigating Rayleigh-Backscattering-Induced Distortion in Radioastronomic Optical Fiber Systems

Nanni
¹
,

Giovannini
²
,

Lenzi³

et al. 2022

J. Lightwave Technol.
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In the context of Radioastronomic applications where the Analog Radio-over-Fiber technology is used for the antenna downlink, detrimental nonlinearity effects arise because of the interference between the forward signal generated by the laser and the Rayleigh backscattered one which is re-forwarded by the laser itself toward the photodetector.The adoption of the so called dithering technique, which involves the direct modulation of the laser with a sinusoidal tone and takes advantage of the laser chirping phenomenon, has been proved to reduce such Rayleigh Back Scattering -induced nonlinearities. The frequency and the amplitude of the dithering tone should both be as low as possible, in order to avoid undesired collateral effects on the received spectrum as well as keep at low levels the global energy consumption.Through a comprehensive analysis of dithered Radio over Fiber systems, it is demonstrated that a progressive reduction of the dithering tone frequency affects in a peculiar fashion both the chirping characteristics of the field emitted by the laser and the spectrum pattern of the received signal at the fiber end.Accounting for the concurrent effects caused by such phenomena, optimal operating conditions are identified for the implementation of the dithering tone technique in radioastronomic systems.

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“…The same SMART box design is used for AAVS2. 15 Early in the deployment phase of EDA2 and AAVS2, an improvement was made to the FEMs to eliminate low-level low-frequency spurious emission from the optical modules 36,37 by introducing a very low frequency (∼ 10 kHz) dithering signal to the laser bias. This modification was successful in eliminating the spurious emission and has no impact on the performance of the system.…”

Section: Thus the Fem Uses Wavelength Division Multiplexing To Combin...mentioning
confidence: 99%

The Engineering Development Array 2: design, performance and lessons from an SKA-Low prototype station
Wayth¹,
Sokołowski²,
Broderick³
et al. 2021
Preprint
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We present the Engineering Development Array 2, which is one of two instruments built as a second generation prototype station for the future Square Kilometre Array Low Frequency Array. The array is comprised of 256 dual-polarization dipole antennas that can work as a phased array or as a standalone interferometer. We describe the design of the array and the details of design changes from previous generation instruments, as well as the motivation for the changes. Using the array as an imaging interferometer, we measure the sensitivity of the array at five frequencies ranging from 70 to 320 MHz.

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

Cited by 16 publications

References 35 publications

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Experimental Evaluation of Hybrid Fibre–Wireless System for 5G Networks

Optimal Configuration Mitigating Rayleigh-Backscattering-Induced Distortion in Radioastronomic Optical Fiber Systems

The Engineering Development Array 2: design, performance and lessons from an SKA-Low prototype station

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