Specialty Optical Fibers Handbook

geometry yield adequate polarization properties for sensing and communications

applications [51]. Fabrication of fiber devices such as long-period gratings based

on liquid-crystal core fibers has also been demonstrated, showing that band

rejection filters can be fabricated using this type of waveguide [52]. Adequate

control of the optical properties of liquids is, thus, extremely important for

dynamically adjustable fiber devices. Advances in physics of fluids, and in

particular in the development of electrical and magnetically controlled liquids,

will continue to spur future developments of devices based on liquid-core fibers.

As we have seen in the previous sections, the waveguide structure also plays

an important role in the guiding properties