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Three-dimensional finite difference simulation of coupling behavior and loss in multimode interference devices

: Weinert, C.M.; Agrawal, N.


IEEE Photonics Technology Letters 7 (1995), No.5, pp.529-31
ISSN: 1041-1135
Journal Article
Fraunhofer HHI ()
finite difference methods; light interference; optical couplers; optical losses; optical waveguide theory; simulation; 3d finite difference simulation; coupling behavior; multimode interference devices; interference couplers; arbitrary waveguide cross section; multimode waveguide spectrum; access waveguide position; dielectric multimode waveguide devices; fabrication tolerant 3-db couplers; insertion loss

A three-dimensional finite difference method scheme for simulation of multimode interference couplers with arbitrary waveguide cross section is presented. With this method we investigate the influence of the multimode waveguide spectrum and of the access waveguide position on 3-dB coupling. These effects, which were not considered in previous theories on multimode interference structures, are shown to be important for the design of dielectric multimode waveguide devices. Taking these effects into account, fabrication tolerant 3-dB couplers with low insertion loss can be designed.