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- Title
A search-and-track algorithm for controlling the number of guided modes of planar optical waveguides with arbitrary refractive index profiles.
- Authors
Ramadan, Tarek
- Abstract
A search-and-track algorithm is proposed for controlling the number of guided modes of planar optical waveguides with arbitrary refractive index profiles. The algorithm starts with an initial guess point in the parameter space that supports a specific number of guided modes. Then, it searches for, and tracks, the boundaries of this space or another space supporting different number of modes. It does so by monitoring the sign of a unified cutoff dispersion function. The algorithm is applied to both symmetric and asymmetric silicon-based parabolic-index waveguides. It shows that unlike asymmetric waveguides, the single-mode condition of symmetric waveguides is controlled by TM-, as opposed to TE-, polarization. This abnormal polarization control is strongest for high index contrast waveguides of sub-micrometer core sizes. The results are verified by full-vectorial beam propagation method.
- Subjects
SEARCH algorithms; OPTICAL waveguides; PLANAR waveguides; ARBITRARY constants; REFRACTIVE index; NUMERICAL analysis; INTEGRATED optics
- Publication
Optical & Quantum Electronics, 2012, Vol 43, Issue 11-15, p175
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1007/s11082-011-9521-4