title: Programmable multiple true-time-delay elements based on a Fourier-domain optical processor.
abstract: A new technique to realize an array of multiple true-time-delay elements, which can be independently and continuously tuned, is reported. It is based on a WDM parallel signal processing approach in conjunction with a diffraction-based Fourier-domain optical signal processor. Programmable linear optical phase transfer functions are realized to obtain different electrical true-time delays. The technique can scale to a large number of wideband true-time-delay lines, with continuously tunable programmable delay. Results demonstrate multiple true-time-delay elements with independent tuning control and verify the concept by tuning the free spectral range of a microwave photonic notch filter. To our best knowledge, this is the first demonstration of multiple independently controllable true-time-delay lines for microwave photonic systems.
authors.affiliation: School of Electrical and Information Engineering, Institute of Photonics and Optical Science, The University of Sydney, NSW 2006, Australia. xiaoke.yi@sydney.edu.au
authors.forename: Xiaoke
authors.initials: X
authors.lastname: Yi
authors.forename: Liwei
authors.initials: L
authors.lastname: Li
authors.forename: Thomas X H
authors.initials: TX
authors.lastname: Huang
authors.forename: Robert A
authors.initials: RA
authors.lastname: Minasian