  We report numerically designed highly nonlinear all glass chalcogenide
microstructured optical fiber for efficient generation of light around 6 micron
through degenerate four wave mixing by considering continuous wave CO laser of
5 to 10 Watts power emitting at 5.6 micron as the pump. By tuning the pump
wavelength, pump power, fiber dispersion and nonlinear properties, narrow and
broad band mid-IR all-fiber light source could be realized. Parametric
amplification of more than 20 decibel is achievable for the narrow band source
at 6.46 micron with a maximum power conversion efficiency of 33 percent while
amplification of 22 decibel is achievable for a B-band source over the
wavelength range of 5 to 6.3 micron with a conversion efficiency of 40 percent.
