Abstract
The subcarrier transmission of quadrature-amplitude modulation radio
frequency (RF) signals over a dispersive fiber link is analytically and numerically
studied. It is well known that the double-sideband transmission of an RF subcarrier
will suffer from frequency-dependent fading caused by fiber dispersion. The
present analyses show that the fading of the RF amplitude depends on the modulation
index in the optical signal, which causes distortion in the constellation
map. We will show that this is attributed to higher order harmonics of modulation
sidebands excited through the nonlinear response of the intensity modulators.
Optical single-sideband transmission, which is believed to be free from dispersion-induced
fading, is also analyzed and predicts a cyclic deviation of the symbols both
in amplitude and phase.
© 2012 IEEE
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