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The growing demand for bandwidth and energy efficiency requires new solutions for signal detection and processing. We demonstrate a concept for high-bandwidth signal detection with low-speed photodetectors and electronics. The method is based on the parallel optical sampling of a high-bandwidth signal with sinc-pulse sequences provided by a Mach-Zehnder modulator. For the electronic detection and processing this parallel sampling enables to divide the high-bandwidth optical signal with the bandwidth <inline-formula><tex-math notation="LaTeX">$B$</tex-math></inline-formula> into <inline-formula><tex-math notation="LaTeX">$N$</tex-math></inline-formula> electrical signals with the baseband bandwidth of <inline-formula><tex-math notation="LaTeX">$B/(\text{2}\,N)$</tex-math></inline-formula>. In proof-of-concept experiments with <inline-formula><tex-math notation="LaTeX">$N=3$</tex-math></inline-formula>, we present the detection of 24 GHz optical signals by detectors with a bandwidth of only 4 GHz. For ideal components, the sampling and bandwidth down-conversion does not add an excess error to the signals and even for the non-ideal components of our proof-of-concept setup, it is below 1&#x0025;. Thus, the rms error for the measurement of the 24 GHz signal was reduced by a factor of about 3.4 and the effective number of bits were increased by 1.8.

High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics