Abstract
Experimental performances analysis of an optical radiofrequency signal mixer based on a
semiconductor optical amplifier Mach–Zehnder Interferometer utilizing an all-optical sampling
method is presented. An optical pulse source generating 21-ps width pulses at a repetition rate of
7.8 GHz samples an intensity-modulated optical carrier carrying an electrical subcarrier at the
intermediate frequency 1 GHz. The efficiency of the all-optical radiofrequency mixer is evaluated
in terms of mixing conversion gain and third-order input intercept point. The conversion gain
varies from 14.4 dB to 20.3 dB according to the chosen frequency. In addition, the electrical
subcarrier modulated by a Quadrature phase shift keying (QPSK) and a 16-quadrature amplitude
modulation (QAM) signal at a data rate of 1 MSymb/s has been frequency up-converted up to 40 GHz
with an error vector magnitude of 11.68% for the QPSK modulation and 10.94% for the
16-QAM.
© 2013 IEEE
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