US 2010/0247023 A1Published application

Optical waveguide type modulator

AssigneeSumitomo Osaka Cement Co., Ltd.

InventorsYasuhiro Ishikawa, Toru Sugamata

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Abstract

An optical waveguide type modulator with a decreased driving voltage and an improved return loss of a driving signal is provided which includes an optical waveguide having a Mach-Zehnder type optical waveguide portion and a signal electrode and a ground electrode modulating an optical wave guided in the optical waveguide. The signal electrode is arranged along at least one of two branched waveguides and Y-branched portions of the Mach-Zehnder type optical waveguide portion and along a part of one Y-branched portion connected to the one branched waveguide. Outside the part of one Y-branched portion, the signal electrode is drawn across a symmetric axis of the Mach-Zehnder type optical waveguide portion with a gap from the one Y-branched portion, and is drawn so as not to extend along the other Y-branched portion connected to the one branched waveguide and so as not to extend across the symmetric axis with a gap from the one branched waveguide.

Claims9

Dependent claims

An optical waveguide type modulator comprising:

a Z-cut type substrate having an electro-optical effect;
an optical waveguide having a Mach-Zehnder type optical waveguide portion formed on the substrate;
and
a modulating electrode modulating an optical wave guided in the optical waveguide,
wherein the Mach-Zehnder type optical waveguide portion includes two branched waveguides and two Y-branched portions and the modulating electrode includes a signal electrode and a ground electrode, and
wherein the signal electrode is arranged along at least one of the two branched waveguides, the signal electrode is disposed along a part of the Y-branched portion connected to the one branched waveguide in a region where the signal electrode is drawn apart from the one branched waveguide and the signal electrode is drawn across a symmetric axis of the Mach-Zehnder type optical waveguide portion, and the signal electrode is disposed so as not to extend along the Y-branched portion connected to the one branched waveguide in a region where the signal electrode is drawn apart from the one branched waveguide and the signal electrode is drawn so as not to extend across the symmetric axis of the Mach-Zehnder type optical waveguide portion.

3 more elements

Dependencies are inferred from the claim text.