Guided modes in chiral fibers

With the various forms of constitutive relations for chiral media integratedly considered, the modal theory is developed for chiral fibers where both the core and cladding are dielectrically chiral. The important role of the wave impedance in the analysis of chiral fibers is pointed out. Analytical and numerical results show that circularly polarized modes could be supported by a properly designed chiral fiber and the chirality in the core and cladding affect the waveguide dispersion in quite different ways.