Optical modulator

Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic

Reexamination Certificate

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Reexamination Certificate

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08031987

ABSTRACT:
An optical modulator suppresses a radiation mode of a microwave generated in a connection substrate or termination substrate from entering a signal electrode of the optical modulator and suppresses modulation properties from being degraded. The optical modulator includes an optical modulation element (1) having a substrate with an electro-optic effect, an optical waveguide formed on the substrate, and a modulating electrode (or a signal electrode (2)) for modulating light passing through the optical waveguide; and a connection substrate (4), arranged outside the substrate, for supplying the optical modulation element with a microwave signal operating the optical modulation element. A signal input terminal (22) and a signal output terminal (23) are formed on the connection substrate (20). A recombination suppression unit suppresses a radiation mode (24) of the microwave signal input to the signal input terminal (22) from being recombined with the signal output terminal (23) provided on the connection substrate.

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Gopalakrishnan, G.K., et al., Electrical Loss Mechanisms in Travelling Wave LiNbO3 Optical , Electronics Letters, vol. 28, No. 2, 1992, pp. 207-209.

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