V.L. Kalashnikov, E. Sorokin, and I.T. Sorokina.
Institut für Photonik, TU Wien, Gusshausstr. 27/387, A-1040 Vienna, Austria
A difference in the physical mechanisms of the spectral continuum formation around 1.5 mm from those around 0.8 mm is established and is illustrated by means of the GIF-movies (MOV-movies can be downloaded from our server). Opposite to the case of the spectral broadening around the first zero-dispersion wavelength (ZDW) in the vicinity of 0.8 mm, there exist:
1) a strong modulation of the extra-broadened spectrum and a Raman scattering induced suppression of the solitonic (blue) part of the spectrum;
2) an optimum length of the taper-waist in case when broadening occurs around the second ZDW at given pulse parameters;
3) an absence of the constant red self-frequency shift of the solitonic spectrum.
Evolution of the spectrum and intensity along the tapered sector of the fiber in the presence of SRS
Evolution of the spectrum and intensity along the tapered sector of the fiber in the absence of SRS
"Spectral surgery" in the absence of the SRS
"Spectral surgery" in the presence of the SRS