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    Grating structure, and manufacturing method of grating coupler provided therewith
    12.
    发明授权
    Grating structure, and manufacturing method of grating coupler provided therewith 有权

    公开(公告)号：US10025031B2

    公开(公告)日：2018-07-17

    申请号：US15569020

    申请日：2016-03-07

    Applicant: PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATION

    Inventor： Masatoshi Tokushima ,  Jun Ushida

    IPC: G02B6/34 ,  G02B6/124 ,  G02B6/13

    Abstract: A grating structure for a grating coupler is provided which has a high efficiency resulting from the operating principle, is easily manufactured, and simultaneously has little reflection loss. This grating structure is provided with a core layer having periodic recesses and protrusions formed on the upper surface, a first upper cladding layer in contact with the upper surface of the core layer, a second upper cladding layer in contact with the upper surface of the first upper cladding layer, and a first lower cladding layer in contact with the lower surface of the core layer. The recessed portions of said recesses and protrusions are filled with the same material as the first upper cladding layer. The refractive index of the material forming the core layer is greater than the refractive index of the materials forming the first upper cladding layer, the second upper cladding layer and the first lower cladding layer. The refractive index of the material of the first upper cladding layer is greater than the refractive index of the material of the second upper cladding layer. The thickness from the upper surface of the protruding portions of the recesses and protrusions to the upper surface of the first upper cladding layer is within the range obtained by subtracting ½ of the depth of the recesses and protrusions from ((2m1−1)/4±⅛) times (m1 being a positive integer) the wavelength, in the material forming the first upper cladding layer, of light inputted and outputted by the grating coupler.

    GRATING STRUCTURE, AND MANUFACTURING METHOD OF GRATING COUPLER PROVIDED THEREWITH
    15.
    发明申请
    GRATING STRUCTURE, AND MANUFACTURING METHOD OF GRATING COUPLER PROVIDED THEREWITH 有权

    公开(公告)号：US20180128975A1

    公开(公告)日：2018-05-10

    申请号：US15569020

    申请日：2016-03-07

    Applicant: PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATION

    Inventor： Masatoshi Tokushima ,  Jun Ushida

    IPC: G02B6/124 ,  G02B6/13 ,  G02B6/34

    CPC classification number: G02B6/124 ,  G02B6/122 ,  G02B6/13 ,  G02B6/136 ,  G02B6/34 ,  G02B2006/12147

    Abstract: A grating structure for a grating coupler is provided which has a high efficiency resulting from the operating principle, is easily manufactured, and simultaneously has little reflection loss. This grating structure is provided with a core layer having periodic recesses and protrusions formed on the upper surface, a first upper cladding layer in contact with the upper surface of the core layer, a second upper cladding layer in contact with the upper surface of the first upper cladding layer, and a first lower cladding layer in contact with the lower surface of the core layer. The recessed portions of said recesses and protrusions are filled with the same material as the first upper cladding layer. The refractive index of the material forming the core layer is greater than the refractive index of the materials forming the first upper cladding layer, the second upper cladding layer and the first lower cladding layer. The refractive index of the material of the first upper cladding layer is greater than the refractive index of the material of the second upper cladding layer. The thickness from the upper surface of the protruding portions of the recesses and protrusions to the upper surface of the first upper cladding layer is within the range obtained by subtracting ½ of the depth of the recesses and protrusions from ((2m1−1)/4±⅛) times (m1 being a positive integer) the wavelength, in the material forming the first upper cladding layer, of light inputted and outputted by the grating coupler.

    ELECTRO-OPTIC DEVICE
    17.
    发明申请
    ELECTRO-OPTIC DEVICE 审中-公开

    公开(公告)号：US20180074349A1

    公开(公告)日：2018-03-15

    申请号：US15559911

    申请日：2016-02-17

    Applicant: NEC Corporation ,  Photonics Electronics Technology Research Association

    Inventor： Junichi FUJIKATA ,  Shigeki TAKAHASHI

    IPC: G02F1/025

    CPC classification number: G02F1/025 ,  G02F2001/0152 ,  G02F2201/063 ,  G02F2202/10

    Abstract: An electro-optic device includes a first semiconductor layer including the rib-type waveguide, which includes a rib part and a first slab part, which extends in a first direction from the rib part; a dielectric layer, which is formed on the rib part; a second semiconductor layer, which extends in a second direction, which is opposite to the first direction, from an upper surface of the dielectric layer; a first high-concentration impurity region, which is formed in the first semiconductor layer to be in contact with the first slab part on the first direction side; and a second high-concentration impurity region, which is formed in a region of the second semiconductor layer on the second direction side. The second high-concentration impurity region is formed in a region other than a region overlapping the first semiconductor layer in a lamination direction.

    Optical fiber mounted photonic integrated circuit device for single mode optical fibers
    18.
    发明授权
    Optical fiber mounted photonic integrated circuit device for single mode optical fibers 有权

    公开(公告)号：US09897761B2

    公开(公告)日：2018-02-20

    申请号：US15444523

    申请日：2017-02-28

    Applicant: FUJITSU LIMITED ,  Photonics Electronics Technology Research Association

    Inventor： Tomoyuki Akiyama ,  Tsuyoshi Aoki

    IPC: G02B6/30

    CPC classification number: G02B6/305

    Abstract: The invention relates to an optical fiber mounted photonic integrated circuit device where the tolerance in the positioning of the coupling between a single mode optical fiber and an optical waveguide provided in the photonic integrated circuit device is increased. A second optical waveguide of which the cross-section of the core is in the form of a slab having a width that is greater than the mode diameter of the single mode optical fiber, and which is tapered in such a manner that the thickness of the core is reduced as the location is closer to the connection portion with the single mode optical fiber, is provided on the input/output end side of the first optical waveguide through which light propagates in such a manner that the inclined connection end surface of the single mode optical fiber is coupled to the upper surface of the second optical waveguide.

    LIGHT RECEIVING ELEMENT
    19.
    发明申请
    LIGHT RECEIVING ELEMENT 审中-公开

    公开(公告)号：US20170345952A1

    公开(公告)日：2017-11-30

    申请号：US15536533

    申请日：2015-12-16

    Applicant: Photonics Electronics Technology Research Association

    Inventor： Kenichiro Yashiki ,  Jun Ushida ,  Masatoshi Tokushima ,  Kazuhiko Kurata

    IPC: H01L31/0232 ,  G02B6/12 ,  H01L31/107

    Abstract: Provided is a light receiving element with high light receiving sensitivity.The light receiving element comprises: a light absorbing layer that absorbs light to generate a carrier; and a diffraction element that converts the optical path of first polarized light, which is obliquely incident on a plane formed by the light absorbing layer, so that the first polarized light propagates in a first direction along the light absorbing layer, and that converts the optical path of second polarized light incident from the same direction as the first polarized light so that the second polarized light propagates in a second direction, opposite the first direction, along the light absorbing layer.

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