| 摘要 |
PURPOSE:To obtain a mode conversion device which can give large wavelength variation width with a relatively low applied voltage by forming an inter digital electrode formed by connecting one-end sides of electrode pieces to a common electrode and a heating electrode which faces the other end sides of the electrode pieces and generates heat by being fed with electricity. CONSTITUTION:The inter-digital electrode 5 formed by connecting one-end sides of the electrode pieces 51, arrayed at equal intervals, to the common electrode 5 respectively and the heating electrode 7 which has one side opposite to the other/end sides of the electrode pieces 51 and generates heat by being fed with electricity are formed on a substrate 1 which is made of an electrooptic material having a light guide 2 formed on a surface; and the heating electrode 7 is arranged in parallel to the light guide 2. Consequently, mode switching can be performed by periodically applying an electric field to the light guide 2 by applying a voltage between the inter-digital electrode 5 and heating electrode 7. Further, the heating electrode 7 is fed with the electricity to generate the heat, and then the large wavelength variation width can be obtained with the relatively low voltage. |
