Photonic band gap fibre with reduced coupling between core modes and surface mode, and method of producing the same

摘要

Photonic band gap fiber with multiple air holes in silica portion extending in the longitudinal direction of the fiber comprising cladding containing air hole periodic structure in an extended triangular lattice configuration, wherein first rows each having a number of air holes at a first pitch are arranged alternately in the cross section of the fiber with multiple second rows of air holes each with multiple air holes at a second pitch which is twice the first pitch, and an air hole core.