Optical waveguide element

JPWO2026100101A5Active Publication Date: 2026-10-14MITSUBISHI ELECTRIC CORP
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Patent Information

Application Number
JP2026500168
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2024-11-06
Filing Date
2025-02-27
Publication Date
2026-10-14
Estimated Expiration
2045-02-27

AI Technical Summary

Technical Problem

Existing optical waveguide devices face challenges in reducing return light due to reflection at the emission end face, and tapered structures to minimize reflection result in increased device size.

Method used

Incorporating a return light blocking layer within the lower cladding layer with a refractive index higher than the cladding layer, positioned at an odd multiple of λ/4 from the exit end toward the incident end face, to cancel out reflected light phases.

Benefits of technology

This configuration reduces reflected light intensity and enables miniaturization of the optical waveguide device.

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Abstract

This disclosure was made to solve the above-mentioned problems, and aims to obtain an optical waveguide element that reduces reflected light and can be miniaturized. The optical waveguide element (100) of the present disclosure is an optical waveguide element (100) that propagates light of wavelength λ, and comprises a substrate (10), a lower cladding layer (20) formed on the substrate (10) and having a refractive index of nc, an optical waveguide layer (30) formed on the lower cladding layer (20), an upper cladding layer (40) formed on the lower cladding layer (20) and the optical waveguide layer (30), and a return light blocking layer (50) formed inside the lower cladding layer (20), made of a material having a refractive index nb higher than the refractive index nc, and having its end on the incident end face side located at a distance of an odd multiple of λ / 4 from the exit end of the optical waveguide layer (30) toward the incident end face side.
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