Methods for modeling multimode waveguides with abrupt changes in propagation axis

This paper describes efforts made to more accurately model fabricated waveguides and examines how component losses can be assessed individually and where abrupt changes in path may be replaced with computation of field parameters at such elements. This approach requires recording the incident field upon an abrupt direction change element. Convolution is then performed with the components calculated transfer function and then used as the succeeding input to the next simulation along a new axis of propagation.