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公开(公告)号：US10025031B2
公开(公告)日：2018-07-17
申请号：US15569020
申请日：2016-03-07
Inventor： Masatoshi Tokushima , Jun Ushida
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.
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Patent Agency Ranking
公开(公告)号：US20180128975A1
公开(公告)日：2018-05-10
申请号：US15569020
申请日：2016-03-07
Inventor： Masatoshi Tokushima , Jun Ushida
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.
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公开(公告)号：US20170345952A1
公开(公告)日：2017-11-30
申请号：US15536533
申请日：2015-12-16
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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公开(公告)号：US11137546B2
公开(公告)日：2021-10-05
申请号：US16788756
申请日：2020-02-12
Inventor： Masatoshi Tokushima , Jun Ushida
Abstract: To provide an optical element that can be more easily aligned with an optical fiber, an optical element includes one grating coupler optically coupled to an optical fiber, a waveguide connected to the grating coupler, a multimode interferometer connected to the waveguide on the opposite side to the grating coupler, and a waveguide inserted between two input/output ports on the branched side of the multimode interferometer.
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公开(公告)号：US10535786B2
公开(公告)日：2020-01-14
申请号：US15536533
申请日：2015-12-16
Inventor： Kenichiro Yashiki , Jun Ushida , Masatoshi Tokushima , Kazuhiko Kurata
IPC: H01L31/0232 , G02B6/12 , G02B6/26 , H01L31/107 , G02B6/124
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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公开(公告)号：US09971099B2
公开(公告)日：2018-05-15
申请号：US15703069
申请日：2017-09-13
Inventor： Masatoshi Tokushima , Jun Ushida
CPC classification number: G02B6/34 , G02B1/11 , G02B27/095
Abstract: A grating coupler includes a grating including a core and an anti-phase reflection coating provided on at least one part of the grating. The anti-phase reflection coating includes a high refractive index layer and a buffer layer. The high refractive index layer has at least one selected from a plurality of attributes characterizing the high refractive index layer. The at least one selected attribute gradually deceases along a propagation direction of light in the core of the grating.
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