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Transmitters for combined radio over a fiber and outdoor millimeter-wave system at 25 GHz

Transmitters for combined radio over a fiber and outdoor millimeter-wave system at 25 GHz
Transmitters for combined radio over a fiber and outdoor millimeter-wave system at 25 GHz
In the modern wireless networks, millimeter-wave radio-frequency (RF) bands are becoming more attractive as they provide larger bandwidth and higher data rates than the today-used systems operating at frequencies below 6 GHz. In addition, according to the fact that coaxial cables exhibit extremely high attenuation for millimeter-wave RF signals, analog radio over fiber techniques (RoF) form a promising technology for delivering unaltered radio waveform to a remote antenna. This paper experimentally analyzes three types of RoF modulations, namely a directly modulated laser, an electro-absorption modulator, and a Mach-Zehnder Modulator. The primary focus is on the implementation of each RoF transmitter in an RoF system, such as those in 5G networks. The experimental study includes a detailed characterization of an RoF system with a 50-m long outdoor free-space RF channel operating in the frequency band of 25 GHz. Frequency response (S-parameters) and third-order nonlinear distortion are investigated in detail. Tests of EVM performance were conducted using an orthogonal frequency division multiplexing signal modulated with 16-quadrature amplitude modulation (16-QAM) with a long-term evolution signal. It is demonstrated that the transmitters studied can operate under a 13.5% EVM limit given for 16-QAM. Apart from the detailed system performance, the considerable power fluctuations in the 25 GHz free-space RF outdoor channel are reported.
Microwave photonics, millimeter wave, optical fiber, optical modulator, radio over fiber
1530-437X
Bohata, Jan
d4258e4b-eb72-46c6-a33a-9255dc342201
Komanec, Matej
be991afd-3cb0-458a-a7c8-4557051e2bcf
Spacil, Jan
395f6831-1e98-4c69-bb22-2d141fe0db06
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Zvanovec, Stanislav
037bcfba-8cc7-4f6f-8226-72d29fe7e636
Bohata, Jan
d4258e4b-eb72-46c6-a33a-9255dc342201
Komanec, Matej
be991afd-3cb0-458a-a7c8-4557051e2bcf
Spacil, Jan
395f6831-1e98-4c69-bb22-2d141fe0db06
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Zvanovec, Stanislav
037bcfba-8cc7-4f6f-8226-72d29fe7e636

Bohata, Jan, Komanec, Matej, Spacil, Jan, Slavík, Radan and Zvanovec, Stanislav (2020) Transmitters for combined radio over a fiber and outdoor millimeter-wave system at 25 GHz. IEEE Sensors Journal, 12 (3), [5501414]. (doi:10.1109/JPHOT.2020.2997976).

Record type: Article

Abstract

In the modern wireless networks, millimeter-wave radio-frequency (RF) bands are becoming more attractive as they provide larger bandwidth and higher data rates than the today-used systems operating at frequencies below 6 GHz. In addition, according to the fact that coaxial cables exhibit extremely high attenuation for millimeter-wave RF signals, analog radio over fiber techniques (RoF) form a promising technology for delivering unaltered radio waveform to a remote antenna. This paper experimentally analyzes three types of RoF modulations, namely a directly modulated laser, an electro-absorption modulator, and a Mach-Zehnder Modulator. The primary focus is on the implementation of each RoF transmitter in an RoF system, such as those in 5G networks. The experimental study includes a detailed characterization of an RoF system with a 50-m long outdoor free-space RF channel operating in the frequency band of 25 GHz. Frequency response (S-parameters) and third-order nonlinear distortion are investigated in detail. Tests of EVM performance were conducted using an orthogonal frequency division multiplexing signal modulated with 16-quadrature amplitude modulation (16-QAM) with a long-term evolution signal. It is demonstrated that the transmitters studied can operate under a 13.5% EVM limit given for 16-QAM. Apart from the detailed system performance, the considerable power fluctuations in the 25 GHz free-space RF outdoor channel are reported.

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Accepted/In Press date: 24 May 2020
e-pub ahead of print date: 27 May 2020
Published date: 22 June 2020
Keywords: Microwave photonics, millimeter wave, optical fiber, optical modulator, radio over fiber

Identifiers

Local EPrints ID: 444879
URI: http://eprints.soton.ac.uk/id/eprint/444879
ISSN: 1530-437X
PURE UUID: 27c0bbf4-c940-4444-ab0a-e8a51ef7c7aa
ORCID for Radan Slavík: ORCID iD orcid.org/0000-0002-9336-4262

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Date deposited: 09 Nov 2020 17:31
Last modified: 28 Apr 2022 02:01

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Contributors

Author: Jan Bohata
Author: Matej Komanec
Author: Jan Spacil
Author: Radan Slavík ORCID iD
Author: Stanislav Zvanovec

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