title: True time delays using conversion/dispersion with flat magnitude response for wideband analog RF signals.
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.
authors.affiliation: University of Southern California, Los Angeles, California 90089, USA. oyilmaz@usc.edu
authors.forename: Omer F
authors.initials: OF
authors.lastname: Yilmaz
authors.forename: Lior
authors.initials: L
authors.lastname: Yaron
authors.forename: Salman
authors.initials: S
authors.lastname: Khaleghi
authors.forename: M Reza
authors.initials: MR
authors.lastname: Chitgarha
authors.forename: Moshe
authors.initials: M
authors.lastname: Tur
authors.forename: Alan
authors.initials: A
authors.lastname: Willner