However, its accuracy is compromised for propagation at large angles, or in components with high refractive-index contrast. There are several alternative methods for simulating wave propagation over large distances: the well-known Beam Propagation Method (BPM) relies on a slowly varying envelope assumption and can simulate large structures quickly. However, when applied to three-dimensional structures, FDTD is highly computationally intensive, making it difficult to treat large integrated optical components efficiently. The finite-difference time-domain (FDTD) technique is one of the most versatile and accurate methods for simulating light propagation in nanoscale components. Its ability to predict the performance of optically large components more accurately than beam propagation methods, combined with its optimized computation engine, renders it a robust waveguide design environment well suited for the virtual prototyping and optimization of planar integrated optical components and circuits. Lumerical MODE Solutions’ variational FDTD (varFDTD) solver efficiently simulates the propagation of optical radiation in a wide array of guided structures, from ridge waveguide-based systems to more complex geometries such as photonic crystals. Back to White Papers Lumerical’s 2.5D variational FDTD (varFDTD) solver offers more accuracy and versatility than beam propagation method (BPM) for the virtual prototyping of planar integrated optical components
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