Abstract
This paper presents the latest developments in the field of liquid crystal
long-period fiber gratings (LC-LPFGs). The new design of LC-LPFG proposed
here has unique propagation properties stemming from the use of special
low-birefringence LC mixtures as an “active” external layer on
the LPFG. In specific temperature regions, the refractive indices of these
LC mixtures are below the refractive index of fused silica. This feature
makes it possible to dynamically control the propagation mechanisms of the
cladding modes. As a result, a high-efficiency thermal and/or electric
tuning of LC-LPFGs could be achieved.
© 2011 IEEE
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