Optical field calculation of impurity diffused channel waveguides by linear segment layer approximation.

A mode analysis based on linear segment layer approximation is demonstrated for arbitrarily graded-index waveguides. To shorten calculation time, normalized propagation constants are achieved with the WKB method, and the optical field distributions are found with the linear segment method. The results coincide well with the exact solution. Electric field distributions with several kinds of diffused waveguides are compared. Optical intensity distributions in a 3-D diffused waveguide are demonstrated using the effective-index method.