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Updated: May 24, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Programmable multiple true-time-delay elements based on a Fourier-domain optical processor.

Xiaoke Yi1, Liwei Li, Thomas X H Huang

  • 1School of Electrical and Information Engineering, Institute of Photonics and Optical Science, The University of Sydney, NSW 2006, Australia. xiaoke.yi@sydney.edu.au

Optics Letters
|February 21, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method for creating multiple, independently tunable true-time-delay elements. This breakthrough in microwave photonics offers scalable, continuously adjustable delay lines for advanced signal processing applications.

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Area of Science:

  • Photonics
  • Microwave Engineering
  • Optical Signal Processing

Background:

  • True-time-delay (TTD) elements are crucial for phased array antennas and signal processing.
  • Existing TTD techniques often lack independent tunability and scalability.

Purpose of the Study:

  • To introduce a new technique for realizing multiple, independently tunable true-time-delay elements.
  • To demonstrate the scalability and continuous tunability of these TTD lines for microwave photonic systems.

Main Methods:

  • Utilized a Wavelength Division Multiplexing (WDM) parallel signal processing approach.
  • Employed a diffraction-based Fourier-domain optical signal processor.
  • Implemented programmable linear optical phase transfer functions to achieve tunable delays.

Main Results:

  • Successfully demonstrated an array of multiple true-time-delay elements with independent tuning control.
  • Verified the concept by tuning the free spectral range of a microwave photonic notch filter.
  • Showcased the technique's scalability for numerous wideband TTD lines with continuous delay adjustment.

Conclusions:

  • This work presents the first demonstration of multiple, independently controllable true-time-delay lines for microwave photonic systems.
  • The proposed technique offers a scalable and continuously tunable solution for advanced photonic signal processing.