Abstract
We report recent advances on the spectral control of continuous-wave-pumped
supercontinuum sources. We show that the generated infrared SC spectrum can
be tailored by using photonic crystal fibers with two zero-dispersion wavelengths.
The dynamics of the spectral broadening is studied, and we show that slightly
different nonlinear mechanisms occur as the zero-dispersion wavelengths are
brought closer to each other. We also report the generation of a visible continuous-wave-pumped
supercontinuum by using dispersion engineered photonic crystal fibers in which
the zero-dispersion wavelength slightly decreases as a function of length
over 200 m. The resulting supercontinuum source spans from 650 nm to 1380
nm with an average output power of 19.5 W. The nonlinear mechanisms producing
this spectacular effect are carefully investigated with support of numerical
simulations. We show that the generation of visible wavelengths is due to
the trapping of dispersive waves by powerful red-shifting solitons.
© 2009 IEEE
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