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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Widely tunable electro-optic distributed Bragg reflector in liquid crystal waveguide.

Giovanni Gilardi1, Rita Asquini, Antonio d'Alessandro

  • 1Dipartimento di Ingegneria Elettronica, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy.

Optics Express
|July 1, 2010
PubMed
Summary

We developed a novel voltage-tunable grating for optical communications. This device offers a wide wavelength tuning range, ideal for wavelength division multiplexing applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Guided-wave devices are crucial for optical communication systems.
  • Liquid crystals offer tunable optical properties for device applications.

Purpose of the Study:

  • To propose and investigate a novel voltage-tunable distributed feedback grating.
  • To explore the use of nematic liquid crystals and coplanar comb electrodes for optical tuning.

Main Methods:

  • Numerical investigation of a guided-wave grating configuration.
  • Utilizing reorientation in nematic liquid crystals for voltage tuning.
  • Employing coplanar comb electrodes for device control.

Main Results:

  • A versatile and easy-to-realize grating configuration was proposed.

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  • A wide tuning range exceeding 100 nm was achieved.
  • The device demonstrated suitability for C and L bands in wavelength division multiplexing.

    • Conclusions:

    • The proposed device offers a practical solution for voltage-tunable optical gratings.
    • The wide tuning range and band coverage are beneficial for wavelength division multiplexing.
    • This configuration presents a promising avenue for advanced optical communication components.