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公开(公告)号：CA2520633C
公开(公告)日：2013-08-06
申请号：CA2520633
申请日：2004-03-26
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： HASHIMOTO YOSHIHIRO , ICHIKAWA JUNICHIRO , HIGUMA KAORU , FUJITA TAKAHISA
Abstract: A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even with a simple structure. An optical modulator bias controller (B) for controlling the DC bias of each optical modulating section of an optical modulator (1) is characterized by comprising DC bias application means (3) for applying a DC bias to each of the optical modulating sections, a low-frequency signal superimposing circuit (2) for superimposing a low-frequency signal f B with a specific frequency on a modulating signal b applied to each optical modulating section, optical sensing means (9) for sensing a change of the intensity of the light wave passing through the combining section, and bias control means (4) for extracting the change of the intensity of light corresponding to the low-frequency signal from the optical sensing means and controlling the DC bias application means according to the extracted change of the intensity of light.
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公开(公告)号：EP1193537A4
公开(公告)日：2005-03-09
申请号：EP01908311
申请日：2001-03-05
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： SUGAMATA TOHRU , HASHIMOTO YOSHIHIRO
CPC classification number: G02F1/2255 , G02F1/0316 , G02F1/225
Abstract: First and second branch waveguides (23-1, 23-2) constituting a Mach-Zehnder optical waveguide are formed on the surface of a substrate (21). A first grounding electrode (25-1), a signal electrode (24), and a second grounding electrode (25-2) are formed on a buffer layer (22). The second grounding electrode (25-2) is divided along the length of the optical waveguide and includes a groove (26) such that a modulating electrode consisting of a signal electrode (24), the first and second grounding electrodes (25-1, 25-2) are symmetrical with respect to the center (II-II) of the first and second branch optical waveguides. The ratio (d2/d1) between the intervals (d1, d2) of the first and second branch optical waveguides and the signal electrode is 3.5 to 7.5.
Abstract translation: 在基板的表面形成有构成马赫 - 曾德尔型光波导的第一分支光波导和第二分支光波导。 第一接地电极，信号电极和第二接地电极设置在形成在基板上的缓冲层上。 第二接地电极被部分切除并分割，以在其中形成沟槽，使得由信号电极，第一和第二接地电极构成的调制电极在第一和第二光波导之间的中心线上基本对称 。 然后，将信号电极和第二分支光波导之间的距离d2与信号电极和第一电极之间的距离d1的比率（d2 / d1）设定为3.5〜7.5。
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公开(公告)号：EP1020754A4
公开(公告)日：2004-08-11
申请号：EP99937008
申请日：1999-08-10
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： SUGAMATA TOHRU , MIYAMA YASUYUKI , HASHIMOTO YOSHIHIRO
IPC: G02F1/035
CPC classification number: G02F1/0356 , G02F2201/066 , G02F2201/07
Abstract: A light modulator of waveguide type (40) comprises electrooptic substrate (1), an optical waveguide (2) for guiding light wave, a traveling wave type signal electrode (3) for controlling the guided light, and a grounding electrode (4). A buffer layer (6), having a width W greater than the width omega of the traveling wave type signal electrode (3), is formed only under traveling wave type signal electrode (3), and the buffer layer is buried at least in part into the surface portion of the substrate (1).
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公开(公告)号：DE69933642T2
公开(公告)日：2007-02-01
申请号：DE69933642
申请日：1999-08-10
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： SUGAMATA TOHRU , MIYAMA YASUYUKI , HASHIMOTO YOSHIHIRO
IPC: G02F1/035
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公开(公告)号：DE60120068T2
公开(公告)日：2006-11-02
申请号：DE60120068
申请日：2001-03-05
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： SUGAMATA TOHRU , HASHIMOTO YOSHIHIRO
Abstract: A first branched optical waveguide and a second branched optical waveguide, to constitute a Mach-Zehnder type optical waveguide, are formed at the surface of a substrate. A first ground electrode, a signal electrode and a second ground electrode are provided on a buffer layer formed on the substrate. The second ground electrode is partially cut away and divided, to form a ditch therein, so that the modulating electrode composed of the signal electrode, the first and the second ground electrodes are substantially symmetrized on the center line between the first and the second optical waveguides. Then, the ratio (d2/d1) of the distance d2 between the signal electrode and the second branched optical waveguide to the distance d1 between the signal electrode and the first electrode is set within 3.5-7.5.
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Patent Agency Ranking
公开(公告)号：CA2305279C
公开(公告)日：2003-02-11
申请号：CA2305279
申请日：1999-08-10
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： HASHIMOTO YOSHIHIRO , MIYAMA YASUYUKI , SUGAMATA TOHRU
IPC: G02F1/035
Abstract: An optical waveguide modulator 40 according to the present invention has a substrate 1 made of a material with an electrooptic effect, an optical waveguide 2 to guide a lightwave 2, a travelling wave-type signal electrode 3 and the ground electrodes 4 to control the lightwave. Moreover, it has a buffer layer 6, at least a part thereof being embedded in the superficial layer of the substrate 1, having a larger width "W" than a width ".omega." o f the travelling wave-type signal electrode 3 only under the signal electrode 3 an d its nearby part.
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公开(公告)号：CA2305279A1
公开(公告)日：2000-02-24
申请号：CA2305279
申请日：1999-08-10
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： MIYAMA YASUYUKI , SUGAMATA TOHRU , HASHIMOTO YOSHIHIRO
IPC: G02F1/035
Abstract: An optical waveguide modulator 40 according to the present invention has a substrate 1 made of a material with an electrooptic effect, an optical waveguide 2 to guide a lightwave 2, a travelling wave-type signal electrode 3 and the ground electrodes 4 to control the lightwave. Moreover, it has a buffer layer 6, at least a part thereof being embedded in the superficial layer of the substrate 1, having a larger width "W" than a width ".omega." o f the travelling wave-type signal electrode 3 only under the signal electrode 3 an d its nearby part.
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公开(公告)号：CA2373430C
公开(公告)日：2007-07-03
申请号：CA2373430
申请日：2001-03-05
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： HASHIMOTO YOSHIHIRO , SUGAMATA TOHRU
Abstract: First and second branch waveguides (23-1, 23-2) constituting a Mach-Zehnder optical waveguide are formed on the surface of a substrate (21). A first grounding electrode (25-1), a signal electrode (24), and a second grounding electrode (25-2) are formed on a buffer layer (22). The second grounding electrode (25-2) is divided along the length of the optical waveguide and includes a groove (26) such that a modulating electrode consisting of a sign al electrode (24), the first and second grounding electrodes (25-1, 25-2) are symmetrical with respect to the center (II-II) of the first and second branc h optical waveguides. The ratio (d2/d1) between the intervals (d1, d2) of the first and second branch optical waveguides and the signal electrode is 3.5 t o 7.5.
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公开(公告)号：DE69933642D1
公开(公告)日：2006-11-30
申请号：DE69933642
申请日：1999-08-10
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： SUGAMATA TOHRU , MIYAMA YASUYUKI , HASHIMOTO YOSHIHIRO
IPC: G02F1/035
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公开(公告)号：CA2520633A1
公开(公告)日：2004-10-14
申请号：CA2520633
申请日：2004-03-26
Applicant: SUMITOMO OSAKA CEMENT CO LTD
Inventor： HASHIMOTO YOSHIHIRO , HIGUMA KAORU , ICHIKAWA JUNICHIRO , FUJITA TAKAHISA
Abstract: A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even with a simple structure. An optical modulator bias controller (B) for controlling the DC bias of each optical modulating section of an optical modulator (1) is characterized by comprising DC bias application means (3) for applying a DC bias to each of t he optical modulating sections, a low-frequency signal superimposing circuit (2 ) for superimposing a low-frequency signal fB with a specific frequency on a modulating signal b applied to each optical modulating section, optical sensing means (9) for sensing a change of the intensity of the light wave passing through the combining section, and bias control means (4) for extracting the change of the intensity of light corresponding to the low- frequency signal from the optical sensing means and controlling the DC bias application means according to the extracted change of the intensity of ligh t.
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