Abstract
Based on photonic vector modulation (PVM) techniques, several novel
schemes are proposed to generate 4-ary amplitude shift keying (4-ASK), 16-ary
quadrature amplitude modulation (16-QAM), and 16-ary amplitude shift keying
(16-ASK) signals at microwave/millimeter-wave (mm-wave) band. First, a 4-ASK
signal generation architecture based on dual-drive Mach–Zehnder modulators
(MZMs) with unequal amplitudes is proposed and experimentally demonstrated.
Then by combining two 4-ASK signal generation schemes in parallel, PVM architectures
for 16-QAM and 16-ASK signal generation are proposed employing three MZMs,
a tunable optical delay line (ODL), and an optical attenuator. The detailed
theoretical analysis, experiment, and simulation certification of these structures
are carried out. Compared with the conventional methods, the electronic driven
circuits in the proposed schemes are simplified by employing PVM techniques.
© 2008 IEEE
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