Abstract
We show that an optical modulator that consists of an integrated dual
parallel Mach–Zehnder modulator (dMZM) can be used for obtaining
not only optical single-side band modulation but also tunability of optical
carrier to sideband ratio (OCSR) simultaneously. Such a modulator will be
vital for optimizing the performance of radio over fiber links by improving
modulation efficiency and receiver sensitivity and by removing fiber
chromatic dispersion induced RF power fading. It is shown that a wide range
of OCSR tunability can be obtained by altering bias voltage of dMZM, and
optimum OCSR, to maximize the output RF power, depends on RF modulation
index and extinction ratio of the integrated dMZM. Good agreement between
theory, simulation, and experiment is obtained. For typical extinction ratio
and low modulation index, it is found that an OCSR of 0 dB is optimum to
maximize RF carrier power. However, for multiband orthogonal
frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) radio, the
best error vector magnitude (EVM) of ${-}$21.8 dB is obtained experimentally at an OCSR of ${\sim}$5.4 dB due to avoidance of clipping induced nonlinear
distortion.
© 2011 IEEE
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