Large-mode-area index-guiding holey fibers with ultra-low ultra-flattened dispersion using a novel hollow-ring defect structure

Abstract

A novel silica index guiding holey fiber (IGHF) design that utilizes a new defect core structure composed of 2-layered high index rings with a triangular lattice structure is proposed in order to control the chromatic dispersion and the mode area. The proposed IGHF shows unique modal properties, such as nearly zero flattened dispersion over a wide spectral range with a low dispersion slope of less than 1(.)10(-3) ps/(km.nm(2)). The numerical results shows that it is possible to design a novel IGHF with an ultra-flattened dispersion of 0 +/- 0.5 ps/(km.nm) from wavelengths of 1.36 mu m to 1.75 mu m and for an effective mode area as large as 100 mu m(2) in the same spectral range. Moreover, with an adiabatic mode transformation, the proposed fiber can be effectively connected to a conventional optical fiber with a low splicing loss of less than 0.01 dB.