Electrically tunable filter based on the long-period fiber grating with a thin liquid crystal layer


  • Aleksandra Czapla Warsaw University of Technology
  • Tomasz Woliński Warsaw University of Technology
  • Roman Dąbrowski Military Univ. of Technology
  • Edward Nowinowski-Kruszelnicki Military Univ. of Technology
  • Wojtek Bock Univ. du Québec en Outaouais




In this paper we report experimental results concerning electrical tuning of a long period grating (LPFG) using as its external layer a liquid crystal (LC). The studied LPFG was fabricated by using UV irradiation in a boron co-doped fiber (PS1250/1500, manufactured by Fibercore). As an LC we used the 1550 nematic LC mixture. Electrical tuning of the LPFG transmission spectrum is achieved by varying the boundary condition of the LC layer. As a result, a blue shift of the attenuation band up to 6.2nm was obtained.

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Author Biography

Aleksandra Czapla, Warsaw University of Technology

Faculty of Physics

Master of Science




How to Cite

A. Czapla, T. Woliński, R. Dąbrowski, E. Nowinowski-Kruszelnicki, and W. Bock, “Electrically tunable filter based on the long-period fiber grating with a thin liquid crystal layer”, Photonics Lett. Pol., vol. 2, no. 3, pp. pp. 116–118, Oct. 2010.