Abstract
The influence of the Mach–Zehnder modulator (MZM) bias and driving
voltages on the transmission performance of multiband orthogonal frequency
division multiplexing ultrawideband radio signals is analyzed theoretically
and experimentally. Particularly, the optical signal-to-noise ratio (OSNR)
required to achieve a given bit error probability is evaluated for a bias
voltage close to the minimum power transmission of the MZM characteristic.
In addition, the required OSNR obtained for that bias voltage is compared
with the OSNR required when the MZM is biased at the quadrature point. The
analysis is performed for different fiber lengths indicated for long-reach
passive optical networks (LR-PONs). It is shown that lower OSNR is required
when the modulator is biased at the quasi-minimum point than when it is biased
at the quadrature point, for all the fiber reaches analyzed. This is due to
the compromise between additional distortion induced by the modulator and
lower carrier-to-signal-power ratio when the quasi-minimum bias point is employed.
In addition, it is also shown that, as for the quadrature bias point, similar
optimum driving voltages are obtained for the different LR-PONs reaches analyzed,
when the quasi-minimum bias point is employed.
© 2012 IEEE
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