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Updated: May 22, 2026

Writing Bragg Gratings in Multicore Fibers
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Optically tunable chirped fiber Bragg grating.

Zhen Li1, Zhe Chen, V K S Hsiao

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan (Sun Yat-Sen) University, Guangzhou 510275, China.

Optics Express
|May 9, 2012
PubMed
Summary

This study introduces an optically tunable chirped fiber Bragg grating (CFBG) using a photoresponsive liquid crystal overlay. The grating

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Telecommunications Technology

Background:

  • Chirped Fiber Bragg Gratings (CFBGs) are crucial optical components.
  • Tuning CFBG properties often requires mechanical or thermal methods.
  • Developing all-fiber tunable optical devices is a key research area.

Purpose of the Study:

  • To present an optically tunable chirped fiber Bragg grating (CFBG).
  • To demonstrate tuning via a photoresponsive liquid crystal overlay.
  • To explore applications in optical communication systems.

Main Methods:

  • Fabrication of a side-polished fiber Bragg grating (SPFBG) with spatially varying residual cladding thickness.
  • Coating the SPFBG with a photoresponsive liquid crystal (LC) overlay.

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  • Irradiation with ultraviolet (UV) light to induce LC phase transition and refractive index modulation.

    • Main Results:

    • Successful optical tuning of the CFBG reflection spectrum was achieved.
    • UV light irradiation caused spectral broadening and a central wavelength shift.
    • The observed spectral changes were reversible and repeatable upon LC phase transition.

    Conclusions:

    • Optically tunable CFBGs can be realized using photoresponsive LCs.
    • This technology offers a novel method for spectral control in fiber gratings.
    • Potential applications include Dense Wavelength Division Multiplexing (DWDM) and all-fiber telecommunication systems.