Abstract
The key goal of this paper consists of a theoretical
and an experimental performances analysis of a photonic
microwave mixer used as a signal down- and up-converter
based on cross-gain modulation in a semiconductor
optical amplifier (SOA). We give, by a small-signal
analysis approach, the analytical equations of the
output optical power carrying the down- and up-converted
signal. Simplified formulas are developed, relating the
mixing conversion gain to the modeling parameters of the
SOA. The efficiency of the photonic microwave mixer
based on an SOA has been evaluated in terms of mixing
conversion gain, third-order input intercept point, and
electrical phase noise. In addition, a subcarrier
modulated by a QPSK, a 16 quadratic-amplitude modulation
(QAM) and a 64 QAM at a data rate of 270 ksymb/s has
been down converted from 1 GHz to 100 MHz with a low
error vector magnitude of about 3.5%.
© 2011 IEEE
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