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公开(公告)号：US20240128716A1
公开(公告)日：2024-04-18
申请号：US18264913
申请日：2021-03-23
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yasuhiko Nakanishi , Takahiko Shindo , Shigeru Kanazawa , Meishin Chin , Yasuaki Hashizume
IPC: H01S5/0683 , H01S5/026 , H01S5/068 , H01S5/125
CPC classification number: H01S5/0683 , H01S5/0265 , H01S5/06821 , H01S5/125 , H01S5/02212
Abstract: To detect deterioration of an SOA and perform feedback control to keep light intensity of output light constant in a configuration in which a DFB laser, an EA modulator, and the SOA are monolithically integrated. A semiconductor optical integrated element includes: a DFB laser that outputs continuous light; an EA modulator that modulates the continuous light; a first multimode interference coupler that inputs the modulated light from a first input port, divides the modulated light, and outputs the divided modulated light from two or more output ports; semiconductor optical amplifiers that are connected to respective output ports of the first multimode interference coupler and amplify each of the divided modulated light; a second multimode interference coupler that has input ports connected to respective outputs of the semiconductor optical amplifiers, multiplexes the amplified modulated light, and outputs the multiplexed modulated light from a first output port; and a monitoring waveguide.
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公开(公告)号：US12169347B2
公开(公告)日：2024-12-17
申请号：US17641022
申请日：2019-09-12
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Josuke Ozaki , Yoshihiro Ogiso , Yasuaki Hashizume
IPC: G02F1/225 , G02F1/21 , H04B10/516
Abstract: A semiconductor Mach-Zehnder optical modulator includes input-side lead-out lines, phase modulation electrode lines, and electrodes that apply modulation signals propagating through the phase modulation electrode lines to waveguides, respectively. The semiconductor Mach-Zehnder optical modulator further includes a conductive layer between a substrate and the waveguides, a plurality of first wiring layers connected to the conductive layer, and a second wiring layer that connects an electrode pad and the plurality of first wiring layers.
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公开(公告)号：US11994783B2
公开(公告)日：2024-05-28
申请号：US17640884
申请日：2019-09-13
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yoshihiro Ogiso , Josuke Ozaki , Yasuaki Hashizume , Mitsuteru Ishikawa , Nobuhiro Nunoya
CPC classification number: G02F1/2255 , G02B6/29344 , G02F1/212 , G02F1/225
Abstract: Provided is an IQ optical modulator including a nest-type MZ optical waveguide having optical modulation regions of I channel and Q channel End portions of an input optical waveguide and an output optical waveguide of the IQ optical modulator are located on a same edge face of a chip of the IQ optical modulator, an optical cross waveguide is included in which an optical waveguide between a first optical combiner and a second optical combiner of the nest-type MZ optical waveguide and the input optical waveguide cross each other, a first optical divider is provided between the I-channel optical modulation region and the Q-channel optical modulation region, and a light propagation direction in the first optical divider and a light propagation direction in the optical modulation regions are opposite to each other.
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Patent Agency Ranking
公开(公告)号：US20230350133A1
公开(公告)日：2023-11-02
申请号：US17768695
申请日：2019-10-29
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yasuaki Hashizume , Yoshihiro Ogiso , Josuke Ozaki
CPC classification number: G02B6/32 , G02B6/29355 , G02B6/29353
Abstract: In the adjustment method of optical coupling for an optical integrated circuit according to the present disclosure, the optimal adjustment position of optical coupling is determined on the basis of, for example, a sum of a plurality of photocurrents at electrodes on arm waveguides respectively formed on the plurality of MZIs in the polarization-multiplexing IQ modulator. According to the maximum value of the sum of the plurality of photocurrents, the light condensing spot position is adjusted to the center position of the end face core of the optical waveguide of the integrated chip. Typically, the light condensing spot position is adjusted to the center of the end face core by displacing the two input lenses.
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公开(公告)号：US20230273497A1
公开(公告)日：2023-08-31
申请号：US18040028
申请日：2020-08-03
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Josuke Ozaki , Yoshihiro Ogiso , Yasuaki Hashizume , Hiromasa Tanobe , Mitsuteru Ishikawa
IPC: G02F1/21 , G02F1/225 , H04B10/548 , H04B10/532 , G02F1/01
CPC classification number: G02F1/212 , G02F1/2255 , H04B10/548 , H04B10/532 , G02F1/0121
Abstract: A semiconductor IQ optical modulator in which a phase modulation unit is configured by a differential capacitively loaded traveling-wave electrode structure based on an SS line configuration, phase modulation units of adjacent channels are spaced apart from each other by 400 μm or more, a distance between main signal lines of the capacitance loading type structure is 60 μm or less, a DC phase adjustment electrode and a PAD are provided between an I side phase modulation unit and a Q side phase modulation unit, the DC phase adjustment electrode is spaced apart by at least 80 μm or more from a signal line of the phase adjustment unit, and a crosstalk characteristic between the adjacent channels is −30 dB or less in a required frequency band.
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公开(公告)号：US20220326587A1
公开(公告)日：2022-10-13
申请号：US17641022
申请日：2019-09-12
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Josuke Ozaki , Yoshihiro Ogiso , Yasuaki Hashizume
Abstract: A semiconductor Mach-Zehnder optical modulator includes input-side lead-out lines, phase modulation electrode lines, and electrodes that apply modulation signals propagating through the phase modulation electrode lines to waveguides, respectively. The semiconductor Mach-Zehnder optical modulator further includes a conductive layer between a substrate and the waveguides, a plurality of first wiring layers connected to the conductive layer, and a second wiring layer that connects an electrode pad and the plurality of first wiring layers.
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公开(公告)号：US20220326585A1
公开(公告)日：2022-10-13
申请号：US17640884
申请日：2019-09-13
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yoshihiro Ogiso , Josuke Ozaki , Yasuaki Hashizume , Mitsuteru Ishikawa , Nobuhiro Nunoya
Abstract: Provided is an IQ optical modulator including a nest-type MZ optical waveguide having optical modulation regions of I channel and Q channel End portions of an input optical waveguide and an output optical waveguide of the IQ optical modulator are located on a same edge face of a chip of the IQ optical modulator, an optical cross waveguide is included in which an optical waveguide between a first optical combiner and a second optical combiner of the nest-type MZ optical waveguide and the input optical waveguide cross each other, a first optical divider is provided between the I-channel optical modulation region and the Q-channel optical modulation region, and a light propagation direction in the first optical divider and a light propagation direction in the optical modulation regions are opposite to each other.
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公开(公告)号：US11971590B2
公开(公告)日：2024-04-30
申请号：US17768695
申请日：2019-10-29
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yasuaki Hashizume , Yoshihiro Ogiso , Josuke Ozaki
CPC classification number: G02B6/422 , G02B6/4227 , G02F1/225 , G02B6/29353 , G02B6/29355 , G02B6/32
Abstract: In the adjustment method of optical coupling for an optical integrated circuit according to the present disclosure, the optimal adjustment position of optical coupling is determined on the basis of, for example, a sum of a plurality of photocurrents at electrodes on arm waveguides respectively formed on the plurality of MZIs in the polarization-multiplexing IQ modulator. According to the maximum value of the sum of the plurality of photocurrents, the light condensing spot position is adjusted to the center position of the end face core of the optical waveguide of the integrated chip. Typically, the light condensing spot position is adjusted to the center of the end face core by displacing the two input lenses.
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