Fig. 3.

Measured (a) and simulated (b) spectra of SSFS in a 2-m-long LMA fiber. The input pulse energies given in (a) are already scaled by the coupling efficiency (64%). A 1720-nm LP filter is used to remove the residue 1550 nm light at the input pulse energy of 997.2 nJ. (c) Measured second-order interferometric autocorrelation of the input pulse (bottom) and the most red-shifted solitons. The pulse widths (FWHMs) are indicated in the plots using the deconvolution factor of 1.54 for sech² intensity profile. For display purpose, the traces are offset along the vertical axis.