Abstract
For the purpose of realizing the large-mode-area (LMA) fibers with low and flat normal group velocity dispersion (GVD) profiles, the approach based on the multicore fiber (MCF) consisting of identical cores is proposed. The contribution of the coupling between two adjacent cores to tailoring the GVD of the MCF can be analyzed by using the dispersive equation, which is evaluated by the coupled mode theory (CMT) and can describe the GVD relation between the MCF and single-core waveguide. Furthermore, the designed 19- and 37-core MCFs with the step-index waveguides exhibit extremely flat normal GVD profiles with values of close to 0 ps/nm·km in the wavelength range of 1500 – 2300 nm, while the effective mode area of the 37-core MCF can reach 440 μm2 at 1900 nm. For the case of the MCF based on the photonic crystal fiber (PCF) structure, the 7-core MCFs can offer the concave-shaped normal GVD profiles in the 1900-nm wavelength region, where the minimum GVD values are around −46 ps/nm·km, and the wavelengths of the dip center can shift from 1880 to 2110 nm by tuning the core spacing. The effective mode areas are increased beyond 170 μm2 at 1900 nm. The proposed LMA normal-dispersion MCFs have potential applications in high-power ultrashort-pulse fiber lasers and amplifiers.
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