Abstract
A digitally operated optical quadrature-amplitude modulation (QAM)
modulator based on a single multielectrode Mach–Zehnder modulator is
presented. Generation and performance of 64QAM are studied in detail.
Simulation results show that a single modulator with 13 electrodes, each of
which is driven by either one of the voltages 0 or 1.68<i>υ</i><sub>π</sub>,
provides close-to-ideal 64QAM constellation despite the inherent
nonlinearity of the modulator. Moreover, employing a sufficient number of
electrodes, close to ideal error performance can be obtained for any
constellation order, or shape. Simulations results are demonstrated for
several different square constellations: 16QAM and 256QAM, and nonsquare
constellations: 32QAM and 128QAM. A brief discussion on the utilization of
the proposed scheme as a predistorter is also given.
© 2011 IEEE
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