The power coupling characteristics of a multimode-interference-based 3-dB coupler have been analyzed by using the vector finite-element and least-squares boundary residual methods. The numerical results obtained have been compared with published experimental data to show the accuracy and the versatility of these numerical schemes. The results predict that a full treatment of the two-dimensional cross section is of particular importance for the design and the simulation of effective waveguide devices to enable a study of their important optical properties such as polarization and fabrication tolerances.
© 1998 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(130.0130) Integrated optics : Integrated optics
(260.3160) Physical optics : Interference
(260.5430) Physical optics : Polarization
Muttukrishnan Rajarajan, B. M. Azizur Rahman, and Kenneth T. V. Grattan, "Accurate Numerical Analysis of Multimode-Interference-Based 3-dB Couplers," Appl. Opt. 37, 5672-5678 (1998)