Abstract
Time-stretched analog-to-digital converters (ADCs) have offered revolutionary enhancements in the performance
of electronic converters by reducing the signal bandwidth prior to digitization. An inherent limitation of the
time-stretched ADC is the frequency-selective response of the optical system that reduces the effective number of
bits for ultrawideband signals. This paper proposes a solution based on spatio-temporal digital processing. The
digital algorithm exploits the optical phase diversity to create a flat RF frequency response, even when the
system's transfer function included deep nulls within the signal spectrum. For a
$10\times$ time-stretch factor with a 10-GHz input signal, simulations show that the proposed
solution increases the overall achievable signal-to-noise-and-distortion ratio to 52 dB in the presence of linear
distortions. The proposed filter can be used to mitigate the dispersion penalty in other fiber optic applications as
well.
© 2007 IEEE
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