Rd Ettinger

Vector finite element solution of saturable nonlinear strip-loaded optical waveguides

A numerical solution is given for nonlinear optical waveguides with power confinement in both transverse dimensions. Self-consistent solutions are obtained by using an accurate vector-finite-element formulation along with the penalty technique. Numerical results for the first quasi-transverse-magnetic power-dependent mode are presented for strip-loaded waveguides with saturable self-focusing media. The variations with total power are illustrated for the modal index and for the fraction of the total power carried by different regions, showing interesting abrupt power switching for realistic geometries. It is shown that the switching effect is maintained in the presence of saturation and over a range of two-transverse-dimensions geometries. This switching effect can be controlled with variation of some of the parameters of the guide.<<ETX>>

The influence of temperature on the eigenmodes of a semiconductor laser

The influence of heating on the eigenmodes of a semiconductor laser is studied, using finite elements to solve for the transverse temperature distribution and the eigenmode, and assuming a first-order variation of the material index with temperature. Besides the expected increase of the effective index, a self-focusing effect leading to beam narrowing and an increase of the confinement factor (which can change by as much as 10%) is evidenced.<<ETX>>