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
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
22 June 2020
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).
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
Additional Information:
Funding Information:
Manuscript received April 16, 2020; revised May 20, 2020; accepted May 24, 2020. Date of publication May 27, 2020; date of current version June 22, 2020. This work was supported in part by a project from the Ministry of Industry and Trade in the Czech Republic (FV30427) in part by Grant Agency of the CTU in Prague (SGS20/166/OHK3/3T/13), and in part by COST action CA 16220. Corresponding author: Jan Bohata (e-mail: bohatja2@fel.cvut.cz).
Publisher Copyright:
© 2009-2012 IEEE.
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
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Date deposited: 09 Nov 2020 17:31
Last modified: 17 Mar 2024 03:16
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Author:
Jan Bohata
Author:
Matej Komanec
Author:
Jan Spacil
Author:
Stanislav Zvanovec
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