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High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics | IEEE Journals & Magazine | IEEE Xplore

High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics


Abstract:

The growing demand for bandwidth and energy efficiency requires new solutions for signal detection and processing. We demonstrate a concept for high-bandwidth signal dete...Show More

Abstract:

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 B into N electrical signals with the baseband bandwidth of B/(\text{2}\,N). In proof-of-concept experiments with N=3, 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%. 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.
Published in: IEEE Photonics Journal ( Volume: 14, Issue: 2, April 2022)
Article Sequence Number: 5515207
Date of Publication: 08 February 2022

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