2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/84839The origin of the Kerr type nonlinearity of the medium as a result of the interaction between photons via the Dirac delta-potential is presented in the formalism adopted from the photon wave function approach. In the view of the result the optical soliton may be treated as a bound state (cluster) of many photons.LatexOpticstext