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AssigneeNippon Telegraph and Telephone Corporation
InventorsMasahiro Sasaura, Kazuo Fujiura, Koji Enbutsu, Tadayuki Imai, Shogo Yagi, Takashi Kurihara, Makoto Abe, Seiji Toyoda, Eishi Kubota
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An optical waveguide capable of having various characteristics and a method of manufacture thereof as well as a method of manufacturing a crystal film are provided. An optical functional material KTaxNb1−xO3 is used as an optical waveguide. The input optical signal is transmitted to the KTaxNb1−xO3 film. The KTaxNb1−xO3 film undergoes changes in optical property when an external voltage signal is applied to the electrode. Therefore, as it passes through the KTaxNb1−xO3 film, the input optical signal is modulated by the characteristic change. The modulated optical signal is taken out as an output optical signal.
An optical waveguide formed by diffusing ions into a crystal and using as a waveguide core an area of the crystal diffused with the ions and having a higher refractive index than those of surrounding areas, wherein the crystal has a cubic structure and a composition of KTa1−xNbxO3 and the ions are Li.
A method of manufacturing an optical waveguide, which is formed by diffusing ions into a crystal and using a waveguide core an area of the crystal diffused with the ions and having a higher refractive index than those of surrounding areas, the method comprising the steps of:
Dependencies are inferred from the claim text.