Semiconductor optical element

JPWO2025186867A5Pending Publication Date: 2026-05-27
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Filing Date
2026-02-26
Publication Date
2026-05-27

AI Technical Summary

Technical Problem

Semiconductor optical devices, particularly those with many butt-joints like modulator-equipped EMLs, suffer from mode instability due to reflected back light, leading to kink discontinuities and potential device failure, while tilting butt-joints to reduce reflections increases light loss and decreases optical output.

Method used

Implementing a periodic structure at the butt-joint or interface between core layers and window portions in the semiconductor optical device to suppress reflected back light without increasing scattered light, thereby stabilizing mode and maintaining high output power.

Benefits of technology

The periodic structure effectively reduces reflected back light, stabilizes mode operation, and maintains high optical output without increasing light loss, enhancing device stability and efficiency.

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Abstract

A laser unit (2) generates laser light. Core layers (4, 9, 18) through which the laser light passes have a butt joint part. A window part (5) is formed on the output side of the core layers (4, 9, 18). The butt joint part, or the interface between the core layers (4, 9, 18) and the window part (5), is a periodic structure (23) in plan view.
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