Abstract
We derive simple analytical expressions, using geometric optics, to describe the power output characteristics of various multimode devices, including acute angle X-junctions, symmetric Y-junctions and multimode interference couplers. The ray-tracing results compare well with results obtained using a finite difference beam propagation method solution of the governing scalar wave equation.
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Beltrami, D.R., Love, J.D. & Ladouceur, F. Multimode planar devices. Optical and Quantum Electronics 31, 307–326 (1999). https://doi.org/10.1023/A:1006971108806
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DOI: https://doi.org/10.1023/A:1006971108806