Figure 5: Numerical simulations.
In the low index contrast (V0=10) configuration: (a) ground state; (b) input after optimization; (c) output after optimization. (g) Intensity distribution in the section of fibre in correspondence of the output spot along propagation direction; note that the focusing occurs in the last part of propagation as indicated by the dashed circle. Results after equation (1) for high index contrast (V0=100): (d) ground state; (e) input after optimization; (f) output after optimization. (h) Intensity distribution in the section of fibre in correspondence of the output spot along propagation direction. Note that the localization since the beginning of propagation and further enhanced at the end. (i) As in h for a doubled propagation length and with the optimization target located in the middle of the fibre. The white line is the intensity profile in correspondence of the focus versus z.
