you can tell someone to calculate gamma. I can calculate like you that as you can calculate. My gamma value 0.001. After that I can calculate non linear length with 40MW power and non linear length become is 4e-5km and my dispersion length is 2.8km. So Is it right or wrong for optical soliton? But in agarwal book gamma value is 1.3 or 1.7.So kindly cLear me. I also a attach file.