Abstract
We demonstrate experimentally an optical system for under-sampling several
bandwidth-limited signals with carrier frequencies that are not known apriori
and can be located anywhere within a very broad frequency region between 0–18GHz. The system is based on under-sampling asynchronously at
three different sampling rates. The optical pulses required for the under-sampling
are generated by a combination of an electrical comb generator and an electro-absorption
optical modulator. To reduce loss and improve performance the implementation
of the optical system is based on a wavelength division multiplexing technique.
An accurate reconstruction of both the phase and the amplitude was obtained
when two chirped signals each with a bandwidth of about 150 MHz were sampled.
© 2009 IEEE
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