Title :
Three-dimensional method for simulation of multimode interference couplers
Author :
Vázquez, Carmen ; Mustieles, Francisco José ; Hernández-Gil, F.
Author_Institution :
Div. de Optoelectron., Telefonica Investigacion y Desarrollo, Madrid, Spain
fDate :
11/1/1995 12:00:00 AM
Abstract :
A three-dimensional (3-D) method for modeling multimode interference devices based on a finite element formulation is presented as an alternative to models having one-dimensional cross-sections only. The method is tested for couplers with two different strongly confined waveguides structures. The results show that full treatment of two-dimensional cross-section is of special importance for design and simulation of waveguide devices for which the effective index approximation is no longer valid. For deep rib waveguide geometries, excess loss greater than 15 dB can be obtained if the 3-D method is not used in the design of the couplers
Keywords :
finite element analysis; integrated optics; light interference; optical couplers; optical losses; optical waveguide theory; rib waveguides; 15 dB; 3-D method; deep rib waveguide geometries; design; effective index approximation; excess loss; finite element formulation; multimode interference coupler simulation; multimode interference devices; photonic integrated circuits; strongly confined waveguides structures; three-dimensional method; two-dimensional cross-section; Couplers; Finite element methods; Interference; Maxwell equations; Optical losses; Optical waveguides; Propagation constant; Propagation losses; Signal processing; Tellurium;
Journal_Title :
Lightwave Technology, Journal of
