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31.发明申请公开(公告)号：US20200379181A1
公开(公告)日：2020-12-03
申请号：US16884244
申请日：2020-05-27
Inventor： Tomoyuki Akiyama
Abstract: An optical demultiplexer is disclosed that separates light including a plurality of wavelengths into light of respective wavelengths. Unit circuits are cascaded in a tree structure. In optical demultiplexer components having the same structure, a combination of arm length differences in waveguide pairs is the same with respect to the N−1 Asymmetric Mach-Zehnder interferometers in which the phase shifters are arranged, where N equals number of 2×2 couplers. In three of the optical demultiplexer components in at least one of the unit circuits, N is three or more. Each of control circuits controls the phase shifters arranged in a corresponding optical demultiplexer component of a corresponding unit circuit in order to increase or decrease a value of a function having, as an argument, a power value acquired by a monitor from among monitors arranged at four optical waveguides at an output side of the corresponding unit circuit.
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公开(公告)号：US20200264375A1
公开(公告)日：2020-08-20
申请号：US16788756
申请日：2020-02-12
Inventor： Masatoshi TOKUSHIMA , Jun USHIDA
IPC: G02B6/293
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：US20200092196A1
公开(公告)日：2020-03-19
申请号：US16562742
申请日：2019-09-06
Applicant: NEC CORPORATION , PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATION , FUJITSU LIMITED
Inventor： Kenji MIZUTANI , Yutaka URINO , Tatsuya USUKI
IPC: H04L12/733 , H04L12/721 , H04L12/707 , H04L12/755 , H04L12/18
Abstract: A parallel computer system includes: direct links that forms a direct connection between a sending node and a receiving node, one-hop links that forms a connection between a sending node and a receiving node by way of a return node that is other than the sending node and the receiving node, and a communication control unit that, when transferring data from a sending node to a receiving node, selects the link that connects the sending node and the receiving node from among a link that uses only a direct link, a link that uses only a one-hop link, and a link that forms a connection combines and uses the direct link and the one-hop link.
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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：US20190339450A1
公开(公告)日：2019-11-07
申请号：US16343998
申请日：2017-10-16
Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY , PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATION
Inventor： Akihiro NORIKI , Takeru AMANO
Abstract: An optical circuit includes a substrate, a waveguide, and a mirror. The substrate includes a first surface. The waveguide includes a first core. The first core is formed of a semiconductor material. The waveguide is over a first surface of the substrate. The mirror reflects light emitted from the waveguide in a direction away from the first surface of the substrate. The mirror is a concave mirror. The waveguide includes a region that functions as an SSC.
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Patent Agency Ranking
公开(公告)号：US10439729B2
公开(公告)日：2019-10-08
申请号：US16117958
申请日：2018-08-30
Inventor： Tomoyuki Akiyama
IPC: H04J14/02 , H04B10/572 , G02B6/293
Abstract: A demultiplexing unit that is provided in an optical device and performs demultiplexing into a plurality of optical signals having wavelengths different from each other includes a plurality of optical filters that are coupled in multiple stages and in which a period of a peak wavelength of a transmission spectrum differs among different stages, a monitoring optical filter coupled to one of the plurality of optical filters, a monitoring photodetector coupled to the output side of the monitoring optical filter, and a plurality of wavelength adjustment units that are provided individually for the plurality of optical filters and the monitoring optical filter and cause wavelength shifts of an equal amount in a same direction.
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公开(公告)号：US20190097383A1
公开(公告)日：2019-03-28
申请号：US16138304
申请日：2018-09-21
Inventor： Tomoyuki Akiyama
CPC classification number: H01S5/0085 , G02B6/122 , G02B27/0977 , H01S3/08027 , H01S3/1062 , H01S5/0287 , H01S5/0612 , H01S5/0687 , H01S5/142 , H01S5/50 , H01S2301/02
Abstract: A modulated light source includes a reflective semiconductor optical amplifier including a mirror at a first end of the reflective semiconductor optical amplifier, a modulator configured to modulate a central wavelength, a first mirror configured to reflect light transmitted by the modulator, an optical filter disposed between a second end of the reflective semiconductor optical amplifier and the modulator, and a second mirror configured to reflect part of incoming light and to transmit the other part of the incoming light. The reflective semiconductor optical amplifier, the optical filter, and the second mirror configure a Fabry-Perot laser. The first mirror is configured to feed light emitted from the Fabry-Perot laser back to the Fabry-Perot laser, and the modulated light source is configured to select light corresponding to one of longitudinal modes oscillated by the Fabry-Perot laser, to modulate the selected light, and to output the modulated light.
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公开(公告)号：US10186838B2
公开(公告)日：2019-01-22
申请号：US15444636
申请日：2017-02-28
Inventor： Hirotaka Uemura , Haruhiko Yoshida , Kazuya Ohira , Mizunori Ezaki , Norio Iizuka
IPC: H01S5/10 , H01S5/323 , G02B6/293 , H01S5/026 , H01S5/065 , G02B6/12 , H01S3/08 , H01S5/02 , H01S5/14
Abstract: According to one embodiment, a semiconductor light-emitting element includes a ring-shaped light-emitting portion provided on a substrate, a mode-control light waveguide of Si provided on an upper or a lower surface side of the light-emitting portion, and including at least two portions located close to the light-emitting portion, and an output light waveguide of Si provided on the upper or the lower surface side, and including a portion located close to the light-emitting portion. The mode-control light waveguide has a structure for coupling light traveling in one of a clockwise circulating mode and a counterclockwise circulating mode, and feeding back the light in the other of the clockwise circulating mode and the counterclockwise circulating mode.
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公开(公告)号：US10146070B2
公开(公告)日：2018-12-04
申请号：US15548687
申请日：2016-02-02
Inventor： Junichi Fujikata , Shigeki Takahashi , Mitsuru Takenaka , Younghyun Kim
Abstract: An optical phase modulator 100 according to an embodiment of this disclosure comprises a rib-type waveguide structure 110 comprising: a PN junction 106 comprising Si and formed in a lateral direction on a substrate; and a Si1-xGex layer 108 that is doped with a p-type impurity and comprises at least one layer laminated on the PN junction 106, so as to be electrically connected to the PN junction 106.
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公开(公告)号：US20180267237A1
公开(公告)日：2018-09-20
申请号：US15838447
申请日：2017-12-12
Inventor： Yousuke OONAWA , Hideaki OKAYAMA
Abstract: The optical waveguide element has a first optical waveguide core; and a second optical waveguide core. In the optical waveguide element, the first optical waveguide core includes a first coupling portion configured to propagate any one polarized wave of a TE polarized wave and a TM polarized wave of a kth-order mode, the other polarized wave of an hth-order mode, and the other polarized wave of a pth-order mode, and a first Bragg reflector connected to the first coupling portion. The second optical waveguide core includes a second coupling portion. The first Bragg reflector includes a rib waveguide including a grating configured to convert the one input polarized wave of the kth-order mode into the other polarized wave of the hth-order mode, reflect the converted polarized wave on the basis of Bragg reflection, and transmit the other input polarized wave of the pth-order mode, and slab waveguides having thicknesses smaller than that of the rib waveguide and integrally formed with the rib waveguide on both side surfaces of the rib waveguide respectively, in the light propagation direction.
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