Abstract
We propose new design parameters for few mode index-guiding holey-fiber (IGHF) that can provide ultra-flattened dispersion properties as well as adiabatic mode transformation capability. A novel silica index guiding holey fiber (IGHF) design is proposed utilizing a new hollow ring structure that is composed of germanosilicate high index ring and hollow air hole imbedded in a triangular lattice structure. The proposed IGHF showed unique modal properties such as nearly zero flattened dispersion over a wide spectral range with low dispersion slope by flexible defect parameter control. It is predicted that ultra-flattened dispersion of 0±0.5ps/(km.nm) from wavelength 1360nm to 1740nm could be achieved with a slope less than 1•10<sup>-3</sup>ps/km.nm<sup>2</sup>, along with fine tuning ability of dispersion value. In contrast to prior IGHF, the proposed fibers can be achieved adiabatic mode transformation from annulus mode to a mode generated from solid multi-core fiber due to germanosilicate rings that is highly compatible to LP<sub>01</sub> mode in conventional step index fiber. This adiabatic mode conversion of optimized IGHF for ultra-flattened dispersion contributed to low splicing loss, 0.01dB at 1550nm to dispersion compensation fiber.
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