Determination of single mode condition in dielectric rib waveguide with large cross section by finite element analysis
ABSTRACT The single mode condition in large cross section rib waveguides is of great interest because almost every kind of active and
passive integrated optoelectronic device or sensor is designed to sustain only the fundamental mode of propagation for better
matching with optical fibers. In this paper we present a criterion to determine the single mode condition for a large cross
section rib waveguides, by comparison between the numerical solutions found with Neumann boundary conditions and Dirichlet
boundaries conditions applied when solving the eigenvalues problem.
Full-textDOI: · Available from: Giovanni Breglio, Mar 04, 2014
- SourceAvailable from: Ayberk Ozden
[Show abstract] [Hide abstract]
- "In general , in order to fulfill this requirement, ridge waveguides are employed and designed with different numerical methods such as mode matching method , beam propagation method (BPM) , finite element method  and effective index method . Design optimization studies on a variety of different material systems including SOI , GeSi , Si nanocrystal sensitized Er-doped SiO 2  and a range of dielectrics  have already been reported. However, these studies do not focus on optimization of single mode a- Al 2 O 3 based waveguide structure and polarization filtering action. "
ABSTRACT: Both passive and active, single mode, wavelength and polarization insensitive design of Al2O3 rib waveguides on SiO2 substrate is reported. Influence of the waveguide height, etch depth, waveguide width and operation wavelength to the mode number, mode size, birefringence and polarization sensitivity were analyzed with Beam Propagation Method. Design parameters for targeted properties are computed for waveguide widths ranging from 0 to 10 µm, and for etch depth ranging from 0 to 0.5 µm for fixed waveguide height of 0.5 µm. A design window for a fixed width of 3.5 µm and etch depths between 0.325 to 0.375 µm is identified for single mode, wavelength and polarization insensitive operation of Al2O3 waveguides on thermal oxide. A novel rib TE mode selective filter design is also suggested as an output of the numerical simulations.Journal of the European Optical Society Rapid Publications 01/2015; 10(15005). DOI:10.2971/jeos.2015.15005 · 1.23 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: A z-stretching finite difference method is developed for simulating the paraxial light beam propagation through a lens in a cylindrically symmetric domain. By introducing a domain transformation in the z-direction, we solve the corresponding complex difference equations containing an interface singularity over a computational space for great simplicity and efficiency. A specially designed matrix analysis is constructed to the study the numerical stability. Computational experiments are carried out for demonstrating our results.Journal of Computational Physics 07/2008; 227(15):7264-7278. DOI:10.1016/j.jcp.2008.04.019 · 2.43 Impact Factor