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Comparison of numerical simulation on active rectangular waveguide couplers by vector, scalar finite element, and
Applied Optics
|June 23, 2010
Summary
The scalar finite element method is reliable for active rectangular waveguide couplers with small refractive index differences or large aspect ratios. The effective refractive index method is difficult for active waveguides.
Area of Science:
- Photonics and Waveguide Engineering
- Computational Electromagnetics
Background:
- Accurate calculation of modal properties is crucial for designing waveguide devices.
- Active waveguide couplers present unique challenges due to gain or loss mechanisms.
Purpose of the Study:
- To compare the accuracy and applicability of three numerical methods for analyzing active rectangular waveguide couplers.
- To identify the most suitable method under specific conditions.
Main Methods:
- Vector Finite Element Method (VFEM)
- Scalar Finite Element Method (SFEM)
- Effective Refractive Index Method (EIM)
Main Results:
- The Scalar Finite Element Method demonstrates high reliability for waveguides with a refractive index difference <15% or large aspect ratios.
- The Effective Refractive Index Method proves challenging for analyzing active waveguides.
Conclusions:
- The choice of numerical method significantly impacts the accuracy of modal property calculations for active waveguide couplers.
- SFEM is a robust choice for specific geometric and material conditions in active waveguide analysis.
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