研究目的
Investigating the suppression of crosstalk between adjacent waveguides in photonic integrated circuits (PICs) by introducing nonuniform subwavelength silicon strips.
研究成果
The introduction of nonuniform subwavelength silicon strips between integrated optical waveguides significantly reduces crosstalk, increasing the coupling length by three to five orders of magnitude compared to uniform or no strips. This method holds promise for achieving highly compact photonic integrated circuits, despite limitations in material and fabrication constraints.
研究不足
The study is limited by the available materials and fabrication resolution, which may restrict the further increase in coupling length. Additionally, the method's effectiveness decreases with smaller waveguide spacings.
1：Experimental Design and Method Selection:
The study employs the particle swarm optimization (PSO) algorithm to determine the optimal widths and positions of nonuniform subwavelength strips between adjacent waveguides. The finite difference eigenmode method (FDE) based software MODE solutions is used for numerical simulations.
2：Sample Selection and Data Sources:
The study focuses on silicon ridge waveguides with specific dimensions and separations, utilizing subwavelength silicon strips to reduce crosstalk.
3：List of Experimental Equipment and Materials:
The simulation involves the use of MODE Solutions software for waveguide modeling and MATLAB for implementing the PSO algorithm.
4：Experimental Procedures and Operational Workflow:
The process includes generating random widths and gaps in MATLAB, transferring these to MODE for model generation, calculating mode effective indices, and iteratively optimizing the design to maximize coupling length.
5：Data Analysis Methods:
The coupling length is calculated based on the mode index difference between even and odd supermodes, with the effective indices obtained from the FDE solver.
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