Heavily Germanium-Doped Silica Fiber With a Flat Normal Dispersion Profile


A heavily germanium-doped (Ge-doped) silica fiber with a four-layer refractive index profile is proposed to obtain all traditional flat dispersion property. The waveguide dispersion in the fiber can be changed by adjusting the fiber parameters, together with the refractive indices and therefore the core radiuses. Hence, the flat traditional dispersion within the fiber will be obtained within the wavelength range of 1540–2600 nm, where the values of the dispersion slope are between 0.0058 and zero.03 . Furthermore, the numerical results show that the flat-high supercontinuum spectrum starting from a thousand to 2600 nm can be generated by launching pump pulses at the wavelength of 1550 nm in the heavily Ge-doped fiber with a four-layer refractive index profile.

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