Compact polarization dual-mode bent waveguide structure and design method thereof

By designing a compact polarization dual-mode bent waveguide structure and optimizing the waveguide shape using FDTD software and a direct binary search algorithm, the problems of large area and high loss in existing bent waveguides are solved, achieving high integration and low loss optical chip transmission performance.

CN120370467BActive Publication Date: 2026-04-10XIAN TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-21
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing compact curved waveguide structures on silicon-based optical chips suffer from problems such as large effective bending area and high transmission loss, which affect the integration and transmission efficiency of the optical chip.

Method used

A compact polarization dual-mode bent waveguide structure was designed, including an integral lower cladding, a bent waveguide main structure, and etched holes. The coupling region, input waveguide, and output waveguide were optimized using FDTD software, and the shape of the bent waveguide was optimized using a direct binary search algorithm to reduce the effective bending area and improve the transmittance.

Benefits of technology

A highly integrated and low-transmission-loss curved waveguide structure was achieved, which improved the transmittance of TE or TM modes in the 1450nm-1650nm band, solved the beam divergence problem, and enhanced the integration and transmission efficiency of the optical chip.

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Abstract

The application discloses a compact polarization dual-mode curved waveguide structure, which comprises a whole lower cladding layer and a curved waveguide main structure, wherein the curved waveguide main structure is arranged above the whole lower cladding layer; the curved waveguide main structure comprises an arc-shaped coupling area, input waveguides and output waveguides are arranged at two ends of the coupling area respectively, and an input port taper is further arranged at the end of the input waveguide away from the coupling area; compared with the existing curved waveguide, the effective bending area is smaller, and the integration of the curved waveguide structure and the transmittance of the output waveguide are improved. The application further discloses a design method of the curved waveguide, wherein a smaller curved waveguide is designed on FDTD software, and an algorithm is used to optimize the coupling area, the input waveguide and the output waveguide of the curved waveguide, so that the transmittance of TE or TM mode in the 1450nm-1650nm wave band range is improved, and the loss of the TE or TM mode in the waveguide during transmission is reduced.
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Citation Information

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