Design of all solid large mode area and nearly zero flattened dispersion microstructure fiber

By employing germanium up-doped and fluorine down-doped, a novel design of all solid trench-assisted 19-core fiber with nearly zero flattened dispersion, large mode area and single supermode transmission is proposed. Dispersion can be adjusted by combining mode coupling mechanism and low refractive index trench. By using this strategy, the a flattened dispersion of 5.28±0.52ps/(nm·km) within a wavelength range of 1430nm~1680nm, which covers whole S+C+L+U communication band and an effective mode area up to 288.2μm2 at 1.55μm are achieved simultaneously. The fiber we proposed here has all solid and structure which is easy to draw and applicable to current DWDM system.