Mohammed SalimJasim Gifted Guardianship Committee , Ministry of Education, Misan, Iraq.
The influence of varying the distance between air holes (Λ)on the geography of
solitone propagation through the fiber has been tested, and the study depend on the Split-Step
Fourier method, the results that were reached by using the MATLAB program. The first-order
solitone was tested with the change in the pitch, as it was found that there is a clear decay in the
amplitude of the resulting pulse with the increase in the pitch . While when increasing the pitch
in the case of second-order solitons, it was noticed that the pulse would split into multiple-order
solitons down to higher-order solitons with the increase in the pitch, while in the case of thirdorder solitons, solitonic fission leads to the supercontinuum generation with increasing the pitch,
where the supercontinuum generation was reached in this way depending on a very small energy
source compared to the energies adopted in supercontinuum generation by the previously
approved methods. among some of the repercussions exhibited and studied are solitons in
different orders.in this study observed when Increased the pitch values that affect on the thirdorder soliton, this result lead to obtained supercontinuum generation (SGG). Many current
applications, including medical and industrial, rely on spectral expansion. In addition,
supercontinuum has an important role in modern communication systems.