An alternative set of soliton solutions for the nonlinear Schrödinger equation is found. When particular cases are analyzed it is shown that bright picosecond solitons are possible in the normal and anomalous dispersion regions of an optical fibre but dark picosecond solitons can only exist in the normal dispersion regime. Also, pulse peak power and width are determined.
Multiple modes-induced multi-pair cross-phase modulation instability in the deep normal dispersion regime of a tellurite high birefringence microstructured optical fiber