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

Aleksandra Czapla, Tomasz Woliński, Roman Dąbrowski, Edward Nowinowski-Kruszelnicki, Wojtek Bock


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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Photonics Letters of Poland - A Publication of the Photonics Society of Poland
Published in cooperation with SPIE

ISSN: 2080-2242