Abstract
In this paper, we investigate a nonlinear compensation technique with two different architectures using
direct modulation (DM) and external modulation (EM) techniques, termed as DM based frequency dithering (DMFD) and EM
based frequency dithering (EMFD). We show that DMFD and EMFD methods operate substantially different in
radio-over-fiber (RoF) system by optimizing the dithering technique relative to the LTE technology. The proposed
techniques is only applicable if the condition of {
$f_{L} < f_{d} < f_{\rm
RF}$
} is met, where
$f_{L}$
represents the
dithering boundary limit of 14 MHz,
$f_{d}$
is DMFD signal
frequency and
$f_{\rm RF}$
is the RoF carrier frequency. Analysis
of the optical launch power for DMFD and EMFD methods reveal that the stimulated Brillouin scattering threshold is
above ∼6 dBm for the LTE-RoF system. In addition, we also unveil that DMFD and EMFD methods do not introduce
additional distortion for the linear and optimum optical launch power regions, which are frequency chirp driven
regions. If the given condition is met, the proposed method improves the LTE-RoF system without any shortcoming.
Finally, at 10 dBm launch power, DMFD and EMFD methods exhibits an average signal-to-noise ratio gain of
∼5.95 and ∼7.71 dB, respectively.
© 2014 IEEE
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