Orbital part of the transverse component of the Poynting vector of fundamental mode and low loss regimes in solid core photonic crystal fibers

Loss dependence of the fundamental mode (FM) on wavelength for all solid band gap fibers (ASBGs) have a sharp decrease at certain set of ASBGF geometric parameters. At the same time, losses in holey fibers (HFs) change monotonically. This difference in behavior of leakage loss is determined by singularities arising in orbital part of the transverse Poynting vector in ASBGF.