Energy flux density in twisted clad optical fibers

The paper reports on the wave propagation through twisted clad optical fibers. Analytical treatment of the boundary-value problem has been presented to evaluate the dispersion relation of the fiber followed by the flux densities. Considering the EH₁₁ and EH₁₂ modes, the propagation constants are obtained to deduce the energy flux density corresponding to these modes. It has been theoretically investigated that the increase of pitch causes the flux density to increase in the fiber core - the feature that would be of great use to device attenuators in communication systems.