Abstract
The integration of orthogonal frequency division multiplexing (OFDM) and
radio-over-fiber (RoF) techniques have made cost-effective and high-data-rate mobile
wireless Internet networks possible, such as wireless broadband networks. This paper
describes the distortion effects of OFDM signals fed via an RF amplifier integrated with
an RoF link employing active and passive electroabsorption modulators (EAM) for chiefly
broadband in-building network applications. First, peak-to-average power ratio was
investigated for RoF links. Second, the adjacent channel power ratio, which estimates
the degree of spectral regrowth due to the in-band and out-of-band interference
resulting from distortion effects from nonlinear amplification, error vector magnitude,
and system distortion effects, was also observed for the proposed system. In this study,
we considered a combined Volterra-series and impulse response-based analytical model for
WiBro systems and compared it to the observed measurements. We analyzed the different
nonlinear distortion effects for OFDM signals driven via an RF amplifier that was
integrated with an RoF link employing a distributed feedback laser as a transmitter and
an active and passive InP EAM as a receiver. The results show significant agreement
between the suggested analytical model and the measurement case. This study is unique in
that it examines the distortion effects of RoF links with active and passive EAMs as an
access point for OFDM-based wireless access networks.
© 2008 IEEE
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