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Title: Direct and external intensity modulation in OFDM RoF links
Authors: Khwandah, SA
Cosmas, JP
Glover, IA
Lazaridis, PI
Prasad, NR
Zaharis, ZD
Keywords: Radio-over-Fiber;Vertical-cavity surface-emitting laser;Mach-Zehnder modulator;External intensity modulation;Direct intensity modulation;Optical OFDM
Issue Date: 2015
Publisher: IEEE
Citation: IEEE Photonics Journal, 7(4): 7902710 , pp. 1 - 10, (2015)
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.
Description: This article is available Open Access to view at:
ISSN: 1943-0655
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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