Direct and External Intensity Modulation in OFDM RoF Links

Sinan A. Khwandah, John P. Cosmas, Ian A. Glover, Pavlos I. Lazaridis, Neeli R. Prasad, Zaharias D. Zaharis

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Radio-over-fiber (RoF) systems comprise light modulation and transmission of millimeter-wave signals over fiber links. The aim of this study is to investigate the performance of external and direct intensity modulation in RoF links and to analyze the drawbacks induced by different components of the optical system. In external modulation, the Mach-Zehnder modulator (MZM) is used, whereas the vertical-cavity surface-emitting laser (VCSEL) is utilized in direct modulation. Both modulation schemes are tested for a vector modulation format, i.e., the quadrature amplitude modulation (QAM), where an orthogonal frequency-division multiplexing (OFDM) scheme is used to generate signal subcarriers. The simulations are carried out with the same values of common global parameters for both schemes of intensity modulation. Although VCSEL is a promising device for future RoF systems, the external modulation shows a more robust performance compared with that of VCSEL when implemented with the OFDM modulation technique.

Original languageEnglish
Article number7902710
JournalIEEE Photonics Journal
Volume7
Issue number4
DOIs
Publication statusPublished - 1 Aug 2015

Fingerprint

Radio-over-fiber
frequency division multiplexing
Orthogonal frequency division multiplexing
Telecommunication links
Modulation
modulation
fibers
Surface emitting lasers
surface emitting lasers
cavities
quadrature amplitude modulation
light transmission
Light modulation
light modulation
Quadrature amplitude modulation
Light transmission
Millimeter waves
Optical systems
millimeter waves
Modulators

Cite this

Khwandah, S. A., Cosmas, J. P., Glover, I. A., Lazaridis, P. I., Prasad, N. R., & Zaharis, Z. D. (2015). Direct and External Intensity Modulation in OFDM RoF Links. IEEE Photonics Journal, 7(4), [7902710]. https://doi.org/10.1109/JPHOT.2015.2456499
Khwandah, Sinan A. ; Cosmas, John P. ; Glover, Ian A. ; Lazaridis, Pavlos I. ; Prasad, Neeli R. ; Zaharis, Zaharias D. / Direct and External Intensity Modulation in OFDM RoF Links. In: IEEE Photonics Journal. 2015 ; Vol. 7, No. 4.
@article{10d519e0f81b43d7b3e543c8f30f8934,
title = "Direct and External Intensity Modulation in OFDM RoF Links",
abstract = "Radio-over-fiber (RoF) systems comprise light modulation and transmission of millimeter-wave signals over fiber links. The aim of this study is to investigate the performance of external and direct intensity modulation in RoF links and to analyze the drawbacks induced by different components of the optical system. In external modulation, the Mach-Zehnder modulator (MZM) is used, whereas the vertical-cavity surface-emitting laser (VCSEL) is utilized in direct modulation. Both modulation schemes are tested for a vector modulation format, i.e., the quadrature amplitude modulation (QAM), where an orthogonal frequency-division multiplexing (OFDM) scheme is used to generate signal subcarriers. The simulations are carried out with the same values of common global parameters for both schemes of intensity modulation. Although VCSEL is a promising device for future RoF systems, the external modulation shows a more robust performance compared with that of VCSEL when implemented with the OFDM modulation technique.",
keywords = "direct intensity modulation, external intensity modulation, Mach-Zehnder modulator (MZM), optical orthogonal frequency-division multiplexing (OFDM), Radio-over-fiber (RoF), vertical-cavity surface-emitting laser (VCSEL)",
author = "Khwandah, {Sinan A.} and Cosmas, {John P.} and Glover, {Ian A.} and Lazaridis, {Pavlos I.} and Prasad, {Neeli R.} and Zaharis, {Zaharias D.}",
year = "2015",
month = "8",
day = "1",
doi = "10.1109/JPHOT.2015.2456499",
language = "English",
volume = "7",
journal = "IEEE Photonics Journal",
issn = "1943-0655",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

Khwandah, SA, Cosmas, JP, Glover, IA, Lazaridis, PI, Prasad, NR & Zaharis, ZD 2015, 'Direct and External Intensity Modulation in OFDM RoF Links', IEEE Photonics Journal, vol. 7, no. 4, 7902710. https://doi.org/10.1109/JPHOT.2015.2456499

Direct and External Intensity Modulation in OFDM RoF Links. / Khwandah, Sinan A.; Cosmas, John P.; Glover, Ian A.; Lazaridis, Pavlos I.; Prasad, Neeli R.; Zaharis, Zaharias D.

In: IEEE Photonics Journal, Vol. 7, No. 4, 7902710, 01.08.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Direct and External Intensity Modulation in OFDM RoF Links

AU - Khwandah, Sinan A.

AU - Cosmas, John P.

AU - Glover, Ian A.

AU - Lazaridis, Pavlos I.

AU - Prasad, Neeli R.

AU - Zaharis, Zaharias D.

PY - 2015/8/1

Y1 - 2015/8/1

N2 - Radio-over-fiber (RoF) systems comprise light modulation and transmission of millimeter-wave signals over fiber links. The aim of this study is to investigate the performance of external and direct intensity modulation in RoF links and to analyze the drawbacks induced by different components of the optical system. In external modulation, the Mach-Zehnder modulator (MZM) is used, whereas the vertical-cavity surface-emitting laser (VCSEL) is utilized in direct modulation. Both modulation schemes are tested for a vector modulation format, i.e., the quadrature amplitude modulation (QAM), where an orthogonal frequency-division multiplexing (OFDM) scheme is used to generate signal subcarriers. The simulations are carried out with the same values of common global parameters for both schemes of intensity modulation. Although VCSEL is a promising device for future RoF systems, the external modulation shows a more robust performance compared with that of VCSEL when implemented with the OFDM modulation technique.

AB - Radio-over-fiber (RoF) systems comprise light modulation and transmission of millimeter-wave signals over fiber links. The aim of this study is to investigate the performance of external and direct intensity modulation in RoF links and to analyze the drawbacks induced by different components of the optical system. In external modulation, the Mach-Zehnder modulator (MZM) is used, whereas the vertical-cavity surface-emitting laser (VCSEL) is utilized in direct modulation. Both modulation schemes are tested for a vector modulation format, i.e., the quadrature amplitude modulation (QAM), where an orthogonal frequency-division multiplexing (OFDM) scheme is used to generate signal subcarriers. The simulations are carried out with the same values of common global parameters for both schemes of intensity modulation. Although VCSEL is a promising device for future RoF systems, the external modulation shows a more robust performance compared with that of VCSEL when implemented with the OFDM modulation technique.

KW - direct intensity modulation

KW - external intensity modulation

KW - Mach-Zehnder modulator (MZM)

KW - optical orthogonal frequency-division multiplexing (OFDM)

KW - Radio-over-fiber (RoF)

KW - vertical-cavity surface-emitting laser (VCSEL)

UR - http://www.scopus.com/inward/record.url?scp=84938704913&partnerID=8YFLogxK

U2 - 10.1109/JPHOT.2015.2456499

DO - 10.1109/JPHOT.2015.2456499

M3 - Article

VL - 7

JO - IEEE Photonics Journal

JF - IEEE Photonics Journal

SN - 1943-0655

IS - 4

M1 - 7902710

ER -