Optical waveguide circuit
The optical waveguide circuit with a high-index grating structure addresses the challenge of miniaturization in silica-based waveguides by achieving high reflectivity and low loss, facilitating compact optical filters for wavelength division multiplexing.
WO2026140043A1PCT designated stage Publication Date: 2026-07-02NT T INC
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- NT T INC
- Filing Date
- 2024-12-23
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Silica-based optical waveguides face challenges in achieving high reflectivity with miniaturized grating lengths due to their small refractive index difference, making it difficult to construct compact optical wavelength filters.
Method used
An optical waveguide circuit design that incorporates a grating structure with a higher refractive index than the optical waveguide core, positioned in close proximity to the core, allowing for high reflectivity with a shorter grating length, utilizing materials like silicon nitride for the grating layer.
Benefits of technology
The design achieves high reflectivity with reduced grating length, enabling compact and low-loss optical filters suitable for wavelength division multiplexing applications.
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Smart Images
Figure JP2024045545_02072026_PF_FP_ABST
Abstract
This optical waveguide circuit includes: a support substrate (101); an under cladding layer (102) formed on the main surface of the support substrate (101) at one side; an optical waveguide core (103) formed on the under cladding layer (102); and a grating structure (104) provided along a waveguide direction of the optical waveguide core (103). The grating structure (104) is in contact with or close to the optical waveguide core (103) and has a refractive index higher than that of the optical waveguide core (103).
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