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公开(公告)号：CA2470551A1
公开(公告)日：2004-12-10
申请号：CA2470551
申请日：2004-06-09
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： MURASHIMA KIYOTAKA , HASHIMOTO KEN , INOUE AKIRA , SHIBATA TOSHIKAZU
Abstract: The present invention relates to a method and apparatus which make it possible to manufacture an optical waveguide type diffraction grating device achieving desired optical characteristics easily. In the present method; the optical fiber is irradiated as refractive index change inducing light outputted from a light source through a phase grating mask after passing through a shutter, an optical system, and a mirror. The mirror is moved in the direction of a z-axis to scan the irradiating position of the refractive index change inducing light on the optical fiber plural times. Every scan among the plurality of scans of the irradiating position, the phase grating mask is relatively displaced along the z-axis the direction opposite to each other from a reference relative position of the phase grating mask relative to the optical fiber.
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公开(公告)号：CA2455028A1
公开(公告)日：2004-07-14
申请号：CA2455028
申请日：2004-01-12
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： HASHIMOTO KEN , SHIBATA TOSHIKAZU , MURASHIMA KIYOTAKA , INOUE AKIRA , IWASHIMA TORU
Abstract: Refractive index change inducing light UV outputted from a light source passes a shutter and an optical system, and then is reflected by a mirror, so as to irradiate an optical fiber by way of a phase grating mask. A diffracting action of the phase grating mask generates a (+)first-order light component and a (-)first-order light component, which interfere with each other, thereby generating interference fringes with a fringe interval ~. As the mirror moves along the z axis, an irradiation position at which the optical fiber is irradiated with the refractive index change inducing light UV by way of the phase grating mask is scanned. While moving the mirror upon irradiation with the refractive index change inducing light UV, the phase grating mask is vibrated along the z axis under the action of a piezoelectric device. The phase or period of vibration varies from scan to scan.
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公开(公告)号：AU6357101A
公开(公告)日：2002-03-07
申请号：AU6357101
申请日：2001-08-21
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： ISHIKAWA SHINJI , HASHIMOTO KEN , SHIBATA TOSHIKAZU
Abstract: The present invention relates to an optical fiber having a sufficient strength, and an optical component, such as a taper-fused coupler with a grating in the coupling region, including the optical fiber. The optical fiber has an outer diameter D; and comprises a core region, a first cladding region surrounding the core region, and a second cladding region surrounding the first cladding region. The core region is a glass region mainly composed of a silica glass material with a GeO2 content of 1 wt% or more. The first cladding region is a glass region, mainly composed of a silica glass material with a GeO2 content of 1 wt% or more, having an outer diameter of 0.80D or more but 0.98D or less. The second cladding region is a glass region mainly composed of a silica glass material with a GeO2 content of less than 0.2 wt%.
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Patent Agency Ranking
公开(公告)号：AU5677601A
公开(公告)日：2001-11-26
申请号：AU5677601
申请日：2001-05-18
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： OHMURA MASAKI , INOUE AKIRA , HASHIMOTO KEN
Abstract: The method of making a diffraction grating device in accordance with the present invention comprises the steps of preparing an optical waveguide having an optical waveguide region doped with an additive adapted to generate a refractive index change upon irradiation with refractive index change inducing light having a predetermined wavelength, and a phase grating having a predetermined projection and depression pattern; separating the optical waveguide and the phase grating from each other by a distance yielding a predetermined optical path difference between zero-order transmitted light and second-order diffracted light of the refractive index change inducing light such that a modulation intensity of interference light between the zero-order transmitted light and second-order diffracted light becomes 85% or less of that obtained when no optical path difference exists between the zero-order transmitted light and second-order diffracted light; and making the refractive index change inducing light incident on the phase grating, so as to form an interference fringe of first-order diffracted light in the optical waveguide region of the optical waveguide, thereby forming the optical waveguide region with a diffraction grating. The present invention provides a method of making a diffraction grating device which is easy to make while exhibiting a sufficiently small cutoff amount in the wavelength band of 0.9 lambda B to 0.95 lambda B (where lambda B is a cutoff peak wavelength) originally meant to be transmitted.
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公开(公告)号：CA2533192A1
公开(公告)日：2005-03-10
申请号：CA2533192
申请日：2004-08-27
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： HASHIMOTO KEN , SUNAGA KEI , OHMURA MASAKI , ISHIKAWA SHINJI , INOUE AKIRA
Abstract: An optical part according to an embodiment of the invention includes a singl e optical waveguide passage, having a first range and a second range, in the order mentioned, along the longitudinal direction thereof. In this optical waveguide passage, the cross-sectional refractive index profile changes alon g the longitudinal direction, in the second range.
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公开(公告)号：CA2355457A1
公开(公告)日：2002-02-28
申请号：CA2355457
申请日：2001-08-20
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： HASHIMOTO KEN , ISHIKAWA SHINJI , SHIBATA TOSHIKAZU
Abstract: The present invention relates to an optical fiber having a sufficient strength, in which not only a core region but also a cladding region contains GeO2, and an optical component including the same. The optical fiber has an outer diameter D; and comprises a core region, a first cladding region surrounding the core region, and a second cladding region surrounding the first cladding region. The core region is a glass region mainly composed of a silica glass material with a GeO2 content of 1 wt% or more. The first cladding region is a glass region, mainly composed of a silica glass material with a GeO2 content of 1 wt% or more, having an outer diameter of 0.80D or more but 0.98D or less. The second cladding region is a glass region mainly composed of a silica glass material with a GeO2 content of less than 0.2 wt%.
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公开(公告)号：EP1659429A4
公开(公告)日：2006-08-09
申请号：EP04772357
申请日：2004-08-27
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： HASHIMOTO KEN , OHMURA MASAKI , SUNAGA KEI , ISHIKAWA SHINJI , INOUE AKIRA
CPC classification number: G02B6/262
Abstract: An optical part according to an embodiment of the invention includes a single optical waveguide passage, having a first range and a second range, in the order mentioned, along the longitudinal direction thereof. In this optical waveguide passage, the cross-sectional refractive index profile changes along the longitudinal direction, in the second range.
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8.发明公开
公开(公告)号：EP1291682A4
公开(公告)日：2005-07-20
申请号：EP01930209
申请日：2001-05-18
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： OHMURA MASAKI , INOUE AKIRA , HASHIMOTO KEN
CPC classification number: G02B6/02138 , G02B6/02085 , G02B2006/12107
Abstract: A method for manufacturing an optical waveguide type diffraction grating, characterized in that an optical waveguide having an optical waveguide region added with an additive for varying the refractive index through irradiation with a light of a specified wavelength for inducing variation of refractive index and a phase grating having a specified pattern of irregularities are provided, the optical waveguide and the phase grating are spaced apart from each other by such a distance that generates a specified optical path difference between zero-order transmission light and second-order diffraction light so that the modulation intensity of interference light between the zero-order transmission light and the second-order diffraction light of the refractive index variation inducing light is equal to or lower than 85% of the modulation intensity when optical path difference is assumed to be not present between the zero order transmission light and the second order diffraction light, and the refractive index variation inducing light is allowed to impinge on the phase grating to form the interference fringe of first-order diffraction light in the optical waveguide region of the optical waveguide, thus forming a diffraction grating in the optical waveguide region. The method can manufacture easily an optical waveguide type diffraction grating having a sufficiently low cutoff quantity in normally transmitting wavelength band of 0.9 lambda >B B B
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