Characteristic analysisof TE waves in nonlinear planar waveguides with Kerr-type core is analyzed by using Jacobielliptic function. Dispersion equation,formulas for dependence of field distributionoptical power on modal index are given. Errors in a published paper (Boardman andEgan,1986) are corrected. Correct data and curves are given for a typical example. Ourresultshave been carefully checked by methods of numerical analysis.