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In this article, analog microwave short-time Fourier transform (STFT) withimproved measurement performance is implemented in the optical domain byemploying stimulated Brillouin scattering (SBS) and channelization. By jointlyusing three optical frequency combs and filter- and SBS-based frequency-to-timemapping (FTTM), the time-frequency information of the signal under test (SUT)in different frequency intervals is measured in different channels. Then, byusing the channel label introduced through subcarriers after photodetection,the obtained low-speed electrical pulses in different channels mixed in thetime domain are distinguished and the time-frequency information of the SUT indifferent channels is respectively obtained and spliced to implement the STFT.For the first time, channelization measurement technology is introduced in theSTFT system based on frequency sweeping and FTTM, greatly reducing thefrequency-sweep range of the required frequency-sweep signal to the analysisbandwidth divided by the number of channels. In addition, channelization canalso be used to improve the time and frequency resolution of the STFT system. Aproof-of-concept experiment is performed. 12-GHz and 10-GHz analysis bandwidthis implemented by using a 4-GHz frequency-sweep signal and 3 channels and a2-GHz frequency-sweep signal and 5 channels. Measurement performanceimprovement is also demonstrated.

Channelized analog microwave short-time Fourier transform in the optical domain with improved measurement performance