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Updated: May 23, 2026

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
Published on: June 25, 2021
True time delays using conversion/dispersion with flat magnitude response for wideband analog RF signals
Omer F Yilmaz1, Lior Yaron, Salman Khaleghi
1University of Southern California, Los Angeles, California 90089, USA. oyilmaz@usc.edu
Abstract:
We demonstrate optical true time delays using wavelength conversion coupled with chromatic dispersion. The transfer function of the delay system is investigated, and it is shown that 3-dB bandwidth of the system can be increased over 40 GHz by using offset pumps. A flat magnitude response (<1 dB peak-peak, 0.2 dB RMS deviation) is achieved in the 1-30 GHz band. Calculated matched filter output to LFM pulses shows good performance, maintaining a > 30 dB peak-to-sidelobe-ratio. The effect of pump depletion during wavelength conversion is also investigated.
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