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    8.
    发明专利
    未知

    公开(公告)号：DE602004023444D1

    公开(公告)日：2009-11-19

    申请号：DE602004023444

    申请日：2004-01-06

    Applicant: NGK INSULATORS LTD

    Inventor： AOKI KENJI ,  KONDO JUNGO ,  KONDO ATSUO ,  MITOMI OSAMU

    IPC: G02F1/035 ,  G02F1/225

    Abstract: A Mach-Zehnder optical waveguide (12) is disposed in a substrate (11) made of a material having an electro-optic effect. Coplanar-waveguide (CPW) modulating electrodes (13, 14) are disposed on a principal surface (11A) of the substrate (11). A dielectric layer (16) is disposed on a reverse surface (11B) of the substrate (11). A supporting substrate (17) having a recess (18) is disposed in contact with the dielectric layer (16) such that the recess (18) is located at a position corresponding to a modulating region (P). The relationship: µ r > µ s is satisfied where µ r represents the dielectric constant of the supporting substrate (17) and µ s represents the dielectric constant of the dielectric constant of solid, liquid, or gaseous substance in the recess (18).

    9.
    发明专利
    未知

    公开(公告)号：DE60226821D1

    公开(公告)日：2008-07-10

    申请号：DE60226821

    申请日：2002-09-04

    Applicant: NGK INSULATORS LTD

    Inventor： KONDO JUNGO ,  KONDO ATSUO ,  AOKI KENJI ,  MITOMI OSAMU

    IPC: G02B6/12 ,  G02F1/225 ,  G02F1/03 ,  G02F1/035

    Abstract: An optical waveguide device 1A has an optical waveguide substrate 15A and a supporting body 8 for supporting the substrate 15A. The substrate 15A has a main body 2 made of an electrooptic material and having a main face 2a and an opposing face 2b, optical waveguides 4A, 4B, and electrodes 3A, 3B, 3C for applying an electrical signal on the optical waveguides. At least a part of the opposing face 8a of the supporting body 8 opposing the substrate 15A is covered with a conductive layer 7A. It is thus possible to reduce the resonance due to substrate radiation of microwave into the whole of the optical waveguide substrate and supporting body.

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