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Updated: Jun 10, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Published on: November 30, 2012

Electrically tunable photonic true-time-delay line.

Yuri O Barmenkov1, José Luis Cruz, Antonio Díez

  • 1Centro de Investigaciones en Optica, Loma del Bosque 115, Col. Lomas del Campestre, 37150, León, Gto, México. yuri@cio.mx

Optics Express
|August 20, 2010
PubMed
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Researchers developed a tunable photonic true-time-delay line using acousto-optic superlattice modulation of fiber Bragg gratings. This novel application electrically tunes light delay by leveraging dynamic phase and group delay properties for advanced optical systems.

Area of Science:

  • Photonics
  • Fiber Optics
  • Acousto-Optics

Background:

  • Fiber Bragg gratings (FBGs) are crucial optical components.
  • Dynamic modulation of FBGs enables advanced functionalities.
  • True-time-delay lines are essential for signal processing.

Purpose of the Study:

  • To introduce a novel application of acousto-optic superlattice modulation on FBGs.
  • To demonstrate a tunable photonic true-time-delay line.
  • To explore the dynamic phase and group delay properties of modulated FBGs.

Main Methods:

  • Utilizing acousto-optic superlattice modulation of a uniform fiber Bragg grating.
  • Employing dynamic phase and group delay properties of the reflected light.
  • Electrically tuning the delay by adjusting voltage to a piezoelectric transducer generating acoustic waves.

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Last Updated: Jun 10, 2026

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Main Results:

  • Demonstrated a tunable photonic true-time-delay line.
  • Achieved a continuously adjustable true-time delay of 400 ps.
  • Observed 300 ps delay adjustment within the 3 dB amplitude range of the first sideband.

Conclusions:

  • Acousto-optic superlattice modulation offers a new method for FBG applications.
  • The demonstrated device provides electrically tunable true-time delay.
  • This technology has potential for advanced optical signal processing and phased array antennas.