研究目的
Investigating the design of ultrashort tapers based on truncated Luneburg lens for efficient coupling between different optical waveguides in integrated photonic circuits.
研究成果
The study presents the theoretical design of compact tapers based on Luneburg lens for efficient coupling between waveguides of varying dimensions in photonic integrated circuits. The designed tapers show low coupling loss and broadband operation, essential for scaling down the size of PICs. The methodology can be expanded to couple waveguides with different geometries.
研究不足
The study is theoretical and relies on numerical simulations. Fabrication imperfections could affect the performance of the designed tapers, with spatial Si thickness variation potentially introducing excess loss.
1：Experimental Design and Method Selection:
The study utilizes the focusing property of the Luneburg lens to design waveguide tapers. The lens is truncated in a shape of a parabolic taper to reduce footprint. Quasi-conformal transformation optics is applied to flatten the Luneburg lens for coupling waveguides with different thicknesses and widths.
2：Sample Selection and Data Sources:
Silicon-on-insulator waveguides with varying geometries are considered. The effective refractive indices of the waveguides and the Luneburg lens are calculated.
3：List of Experimental Equipment and Materials:
Comsol Multiphysics ? for QCTO, generating electric field distribution figures, and creating 3D models; Lumerical FDTD Solutions ? for calculating scattering parameters.
4：Experimental Procedures and Operational Workflow:
The 2D gradient index distribution is translated to the 3D thickness profile of the silicon layer. The performance of the designed tapers is evaluated through numerical simulations.
5：Data Analysis Methods:
The coupling and return losses are calculated based on 3D simulations to evaluate the performance of the designed tapers.
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