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Hybrid RoF-RoFSO system using directly modulated laser for 24-26 GHz 5G networks

Hybrid RoF-RoFSO system using directly modulated laser for 24-26 GHz 5G networks
Hybrid RoF-RoFSO system using directly modulated laser for 24-26 GHz 5G networks

We present an experimental hybrid radio over fiber (RoF) and radio over free space optics (RoFSO) system employing a directly modulated laser (DML) for a radio frequency band of 24-26 GHz. Moreover, a 3.6 m long radio free space link is combined with a pair of wideband antennas. We outline the specific settings of the proposed high-frequency system for deployment in the centralized fronthaul networks as part of the 5th generation wireless technologies. We show a potential extension in terms of the added optical loss when using a 100 MHz signal bandwidth. In order to determine the optimum system performance, the setting of directly-modulated laser bias current is investigated. Measured results illustrate that the performance of the proposed system is less susceptible for up to medium turbulence conditions by maintaining an error vector magnitude (EVM) value below the limit of 9 %, given for 64-quadrature amplitude modulation (64-QAM). The lowest recorded EVM of the whole system for 64-QAM and a 100 MHz bandwidth at a frequency 24 GHz is 4.1 % while using a band pass filter to reduce amplified spontaneous emission noise in the system.

5G, free space optics, Radio over fiber, turbulence
IEEE
Bohata, Jan
d4258e4b-eb72-46c6-a33a-9255dc342201
Komanec, Matej
be991afd-3cb0-458a-a7c8-4557051e2bcf
Spacil, Jan
395f6831-1e98-4c69-bb22-2d141fe0db06
Zvanovec, Stanislav
037bcfba-8cc7-4f6f-8226-72d29fe7e636
Ghassemlooy, Zabih
0516a0fd-0d2c-4511-9e05-8888920ff78f
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Bohata, Jan
d4258e4b-eb72-46c6-a33a-9255dc342201
Komanec, Matej
be991afd-3cb0-458a-a7c8-4557051e2bcf
Spacil, Jan
395f6831-1e98-4c69-bb22-2d141fe0db06
Zvanovec, Stanislav
037bcfba-8cc7-4f6f-8226-72d29fe7e636
Ghassemlooy, Zabih
0516a0fd-0d2c-4511-9e05-8888920ff78f
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d

Bohata, Jan, Komanec, Matej, Spacil, Jan, Zvanovec, Stanislav, Ghassemlooy, Zabih and Slavík, Radan (2018) Hybrid RoF-RoFSO system using directly modulated laser for 24-26 GHz 5G networks. In 2018 11th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP 2018). IEEE. 5 pp . (doi:10.1109/CSNDSP.2018.8471867).

Record type: Conference or Workshop Item (Paper)

Abstract

We present an experimental hybrid radio over fiber (RoF) and radio over free space optics (RoFSO) system employing a directly modulated laser (DML) for a radio frequency band of 24-26 GHz. Moreover, a 3.6 m long radio free space link is combined with a pair of wideband antennas. We outline the specific settings of the proposed high-frequency system for deployment in the centralized fronthaul networks as part of the 5th generation wireless technologies. We show a potential extension in terms of the added optical loss when using a 100 MHz signal bandwidth. In order to determine the optimum system performance, the setting of directly-modulated laser bias current is investigated. Measured results illustrate that the performance of the proposed system is less susceptible for up to medium turbulence conditions by maintaining an error vector magnitude (EVM) value below the limit of 9 %, given for 64-quadrature amplitude modulation (64-QAM). The lowest recorded EVM of the whole system for 64-QAM and a 100 MHz bandwidth at a frequency 24 GHz is 4.1 % while using a band pass filter to reduce amplified spontaneous emission noise in the system.

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More information

e-pub ahead of print date: 24 September 2018
Venue - Dates: 11th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP 2018), Budapest, Hungary, 2018-07-18 - 2018-07-20
Keywords: 5G, free space optics, Radio over fiber, turbulence

Identifiers

Local EPrints ID: 425934
URI: https://eprints.soton.ac.uk/id/eprint/425934
PURE UUID: 8126836c-ce30-4045-ba65-285eb4a3e595
ORCID for Radan Slavík: ORCID iD orcid.org/0000-0002-9336-4262

Catalogue record

Date deposited: 07 Nov 2018 17:30
Last modified: 10 Dec 2019 01:41

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Contributors

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

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