Optical modulator

By designing a specific structure for the DC waveguide in the optical modulator, increasing the cross-sectional area and impedance, the problem of DC drift was solved, resulting in a longer lifespan for the optical modulation element.

CN116324596BActive Publication Date: 2026-06-26TDK CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TDK CORP
Filing Date
2021-09-29
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing optical modulators do not adequately suppress DC drift, resulting in short lifespans for optical modulation elements.

Method used

An optical modulator is designed in which the cross-sectional area of ​​the DC waveguide is larger than that of the RF waveguide, and the DC waveguide has a specific raised structure, including first and second intermediate raised portions and an uppermost raised portion. In the cross section perpendicular to the light propagation direction, the cross-sectional area of ​​the DC waveguide is larger than that of the RF waveguide, and the raised portions of the DC waveguide are offset from the center or have additional layered portions to increase impedance.

Benefits of technology

It effectively suppressed DC drift of the optical modulator and extended the lifespan of the optical modulation element.

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Abstract

Provided is an optical modulator including: a substrate; a plurality of electro-optic material layers formed on the substrate; and an electrode formed on the electro-optic material layers, the electro-optic material layers having an RF portion waveguide to which a modulation signal is applied and patterned, and a DC portion waveguide to which a DC bias signal is applied and patterned, the cross-sectional area of the DC portion waveguide being larger than the cross-sectional area of the RF portion waveguide in a cross section perpendicular to the direction of propagation of light. The optical modulator according to the present application can suppress DC drift.
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