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公开(公告)号：US20190049756A1
公开(公告)日：2019-02-14
申请号：US15555605
申请日：2016-09-16
Applicant: Sumitomo Osaka Cement Co., Ltd
Inventor： Norikazu MIYAZAKI , Toru SUGAMATA
CPC classification number: G02F1/0123 , G02F1/225 , G02F2001/212 , G02F2201/12 , G02F2201/58 , G02F2202/20
Abstract: To perform a stable bias control by improving detection accuracy of intensity of an dither signal component, which is detected by a photo detector, in an optical modulator including a bias electrode to which a dither signal is applied, and a photo detector that monitors an optical signal propagating through the inside of an optical waveguide in the same substrate. The optical modulator includes: a substrate having a piezoelectric effect (102); an optical waveguide (116a or the like) that is formed on the substrate; a bias electrode (158a or the like) that controls an optical wave that propagates through the optical waveguide; and a photo detector (168a or the like) that is formed on the substrate, and monitors an optical signal that propagates along the optical waveguide. At least one suppressing unit (190 or the like), which suppresses a surface acoustic wave that propagates from the bias electrode to the photo detector, is disposed between a region in which the bias electrode is formed and a portion in which the photo detector is disposed on the substrate.
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公开(公告)号：US20190014657A1
公开(公告)日：2019-01-10
申请号：US15770649
申请日：2016-09-15
Applicant: Sumitomo Osaka Cement Co., Ltd
Inventor： Norikazu MIYAZAKI , Toru SUGAMATA
CPC classification number: H05K1/0271 , G02F1/035 , G02F1/2255 , G02F2001/212 , H05K1/028 , H05K1/111
Abstract: To suppress peeling-off or cracks of a solder-fixing portion, which are caused by vibration during transportation or operation, in an optical modulator with FPC, thereby suppressing deterioration of radio-frequency characteristics of a signal path in an effective manner at low cost.An optical modulator 100 includes a flexible printed circuit (106) that performs electrical connection with a circuit substrate. The flexible printed circuit has a substantially quadrilateral shape. In the flexible printed circuit, a pad (210 and the like), which is electrically connected to the circuit substrate, is provided along one side of the substantial quadrilateral. In addition, in the flexible printed circuit, signal patterns (220 and the like), which are connected to signal lead pins (120 and the like) for signal transmission which is provided in the optical modulator, are provided in another side opposite to the one side. In addition, the flexible printed circuit includes an additional fixing portion (240 and the like) and/or a notched portion (810 and the like) which are configured to increase a natural vibration frequency of the flexible printed circuit in a state of being connected to the signal lead pin and the circuit substrate.
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公开(公告)号：US20180275481A1
公开(公告)日：2018-09-27
申请号：US15927496
申请日：2018-03-21
Applicant: Sumitomo Osaka Cement Co., Ltd
Inventor： Minoru SHINOZAKI , Toru SUGAMATA
CPC classification number: G02F1/2255 , G02B6/12007 , G02B26/001 , G02F1/0121 , G02F1/0305 , G02F2001/0113 , G02F2001/212 , G02F2201/505 , G02F2203/15 , H01S5/02276
Abstract: An optical modulator includes an optical modulation element that is accommodated in a housing. A plurality of lead pins, which are electrically connected to the optical modulation element through wire bonding, are fixed to a lateral wall of the housing. Each of the plurality of lead pins includes a portion that protrudes into an inner space (inner surface side) of the housing. A resonance suppressing structure (for example, a concave portion), which is configured to suppress resonance between the lead pins, is provided in a lateral wall portion to which the plurality of lead pins are fixed.
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公开(公告)号：US20180088361A1
公开(公告)日：2018-03-29
申请号：US15719730
申请日：2017-09-29
Applicant: Sumitomo Osaka Cement Co., Ltd
Inventor： Toru SUGAMATA , Norikazu MIYAZAKI
IPC: G02F1/03
CPC classification number: G02F1/0316 , G02F1/0327 , G02F2203/50
Abstract: An optical modulator includes an optical modulation element (102) including a plurality of signal electrodes (112a and the like), a plurality of lead pins (116a and the like) for inputting high frequency signals, and a relay substrate (118) in which conductor patterns (202a and the like) that electrically connect the lead pins and the signal electrodes are formed, and at least one of the conductor patterns in the optical modulator is constituted so that at least one resonant frequency of the at least one of the conductor patterns is different from at least one resonant frequency of at least one of the other conductor patterns.
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