Abstract
Photonic crystal fibers (PCFs) have attracted significant attention during the last years and much research has been devoted to develop fiber designs for various applications, hereunder tunable fiber devices. Recently, thermally and electrically tunable PCF devices based on liquid crystals (LCs) have been demonstrated. However, optical tuning of the LC PCF has until now not been demonstrated. Here we demonstrate an all-optical modulator, which utilizes a pulsed 532nm laser to modulate the spectral position of the bandgaps in a photonic crystal fiber infiltrated with a dye-doped nematic liquid crystal. We demonstrate a modulation frequency of 2kHz for a moderate pump power of 2-3mW and describe two pump pulse regimes in which there is an order of magnitude difference between the decay times.
Highlights
Photonic crystal fibers (PCFs) have attracted significant attention during the last years and much research has been devoted to develop fiber designs for various applications, hereunder tunable fiber devices
We present an all-optical tunable Liquid Crystal Photonic BandGap (LCPBG) fiber device, which utilizes a pulsed 532nm laser to modulate the spectral position of the bandgaps in a PCF infiltrated with a dye-doped nematic liquid crystal
In order to investigate the dynamics of the LCPBG fiber device, a low-power CW probe laser was coupled into the fiber together with the pulsed pump laser
Summary
Photonic crystal fibers (PCFs) have attracted significant attention during the last years and much research has been devoted to develop fiber designs for various applications, hereunder tunable fiber devices. We present an all-optical tunable Liquid Crystal Photonic BandGap (LCPBG) fiber device, which utilizes a pulsed 532nm laser to modulate the spectral position of the bandgaps in a PCF infiltrated with a dye-doped nematic liquid crystal. This device utilizes local heating of the LC to shift the spectral position of the bandgaps and introduces, in principle, no PDL. A modulation frequency of 2kHz is demonstrated for a pump power of 2-3mW
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