We proposed a new approach to enhance supercontinuum (SC) spectrum generation in dispersion-decreasing optical fiber with a new dispersion profile. The approach is based on the change of the chromatic dispersion D(λ,z) as a concave function of wavelengths that has no zero-dispersion wavelengths over the whole or part of the fiber as D(λ,z) is positive. A flatter and broader spectrum can be produced in our scheme. The general criteria parameters are obtained for characterizing SC shapes in the optical fibers.
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