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公开(公告)号：US20210406077A1
公开(公告)日：2021-12-30
申请号：US16646901
申请日：2019-07-18
发明人： Yutaka Urino
IPC分类号： G06F9/50 , G06F17/16 , G06F15/173
摘要： Speeding up of parallel computation is to be achieved. A parallel computation method comprises a step for distributing respective first-level small pieces of data, that are formed by dividing data, to respective computation nodes in plural computation nodes; a step for further dividing, in at least one first computation node in the plural computation nodes, the first-level small piece of data into second-level small pieces of data; a step for transferring, in parallel, the respective second-level small pieces of data from the at least one first computation node to the plural computation nodes; a step for transferring, in parallel, the transferred second-level small pieces of data from the respective computation nodes in the plural computation nodes to at least one second computation node in the plural computation nodes; and a step for reconstructing, in the at least one second computation node, the first-level small piece of data by using the second-level small pieces of data transferred from the plural computation nodes.
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公开(公告)号：US20210306087A1
公开(公告)日：2021-09-30
申请号：US17197282
申请日：2021-03-10
发明人： Tomoyuki Akiyama , Shoichiro Oda
IPC分类号： H04J14/02 , H04B10/079 , G02B6/12 , H04J14/06 , H04B10/564
摘要： An optical communication component includes three or more couplers, a pair of waveguides, a phase shifter, a detector, and a controller. Each of the couplers multiplexes two input optical signals and two-branch outputs the multiplexed optical signals. Each of the pair of waveguides connects between the couplers and outputs each of the optical signals two-branch output from one of the couplers to another one of the couplers. The phase shifter, included in each of the waveguides, adjusts a phase amount of each of the optical signals passing through the waveguides. The detector detects an amount of power of the optical signal that has been subjected to phase adjustment and that is two-branch output from a most downstream coupler, from among the couplers, located in the traveling direction of the optical signal. The controller controls, based on the detected amount of power, each of the phase shifters.
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公开(公告)号：US10996539B2
公开(公告)日：2021-05-04
申请号：US16440407
申请日：2019-06-13
摘要： Provided is a SIS-type electro-optic modulator capable of realizing highly efficient optical coupling with a rib-type Si waveguide, improving modulation efficiency, realizing reduction of electric capacity and lead-out resistance in stacked semiconductor layers. The modulator includes a SIS junction constituted by first and second semiconductor layers having different type of conductivity and a dielectric layer interposed therebetween, wherein an electrical signal from electrodes coupled to the first and second semiconductor layers causes free carriers accumulate, deplete or invert on both sides of the dielectric layer, thereby modulating a free carrier concentration felt by an optical signal electric filed, light having a polarization component orthogonal to the width direction of the SIS junction is incident on the dielectric layer, and the width of the SIS junction is λ/neff or less (λ is the wavelength of the incident light and neff is an effective refractive index of the modulator to the incident light).
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公开(公告)号：US10911148B2
公开(公告)日：2021-02-02
申请号：US16655659
申请日：2019-10-17
发明人： Tomoyuki Akiyama
IPC分类号： H04B10/50 , H04J14/02 , H04J14/06 , H04B10/548
摘要： An optical transmission apparatus includes first and second optical waveguides to transmit light of multiple wavelengths; optical couplers on the waveguides, to couple the lights transmitted through the waveguides, so as to output the coupled light to the waveguides; phase shifters provided at preceding stages of part of the optical couplers, to change a phase shift amount of the light transmitted through the first and/or second optical waveguides, wherein the number of optical couplers in the part is greater than or equal to the number of the types of wavelengths; a monitor to monitor the intensity of the light output to the second optical waveguide via the optical coupler at the last stage; and a controller to control the phase shifters by changing the phase shift amount for each of the phase shifters in a direction in which the output of the monitor decreases.
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公开(公告)号：US20200235547A1
公开(公告)日：2020-07-23
申请号：US16087961
申请日：2017-03-29
发明人： Kenji Mizutani
摘要： Provided is an optical transmitter in which a forward-end surface of a semiconductor laser is set to an effective reflectance with respect to near-end reflection. The optical transmitter is provided with a semiconductor laser and at least one optical function element to which output light from the semiconductor laser is input. The optical transmitter is characterized in that: a signal-to-noise ratio in an optical receiver which receives an optical signal output from the optical transmitter includes a first contribution component caused by re-entry of reflected return light from the at least one optical function element into the semiconductor laser, and a second contribution component caused irrespective of the strength of the optical signal input to the optical receiver; and the reflectance of a forward-end surface of the semiconductor laser is set to a value in a predetermined range including a reflectance that maximizes the signal-to-noise ratio due to the first contribution component and the second contribution component with respect to a change in the reflectance of the forward-end surface.
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公开(公告)号：US10547406B2
公开(公告)日：2020-01-28
申请号：US15642859
申请日：2017-07-06
发明人： Tomoyuki Akiyama
摘要： An optical element includes a gain chip, a ring modulator, which is a band-pass filter, a first optical waveguide and a second optical waveguide that are optically connected to the ring modulator, and a heater, wherein the first optical waveguide and the second optical waveguide are formed to be equal in optical path length (have no difference in optical path length) between a first light coupling point and a second light coupling point and equal in shape and length between the first light coupling point and the second light coupling point (to be symmetrical with the ring modulator interposed therebetween (with respect to the ring modulator)).
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公开(公告)号：US20190268085A1
公开(公告)日：2019-08-29
申请号：US16344269
申请日：2017-09-06
发明人： Yutaka Urino
摘要： In an embodiment, a network system comprises a plurality of nodes and a plurality of optical amplifiers. A first node comprises a first transmitter configured to send a wavelength-division-multiplexed optical signal and a first receiver configured to receive a wavelength-division-multiplexed optical signal, and the second node comprises a second transmitter configured to send a wavelength-division-multiplexed optical signal and a second receiver configured to receive a wavelength-division-multiplexed optical signal. The first transmitter and the second transmitter are optically connected to an input of the first optical amplifier and an input of the second optical amplifier, respectively, and the first receiver and the second receiver are optically connected to an output of the first optical amplifier and an output of the second optical amplifier, respectively. Each of the first photoreceiver and the second photoreceiver comprises a photoreceiver and a reception circuit. The photoreceiver is electrically connected, by flip chip connection, to a reception circuit. A reception circuit is configured not to comprise a transimpedance amplifier.
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8.发明申请公开(公告)号：US20190245642A1
公开(公告)日：2019-08-08
申请号：US16254983
申请日：2019-01-23
发明人： Tomoyuki AKIYAMA
CPC分类号： H04J14/0209 , G02B6/12007 , G02B6/2935 , H04B10/07 , H04J14/0257
摘要： An optical demultiplexer has at least one unit circuit formed by three AMZs having a same arm length difference and cascaded in a tree structure in which two output ports of the 1st AMZ are connected to the 2nd AMZ and the 3rd AMZ, respectively, wherein the unit circuit has first and second monitors connected to the first and second output ports of the 2nd AMZ, and third and fourth monitors connected to the first and second output ports of the 3rd AMZ, a first control circuit controlling the transmissivity of the 1st AMZ so as to increase the monitoring result of the second and fourth monitors, a second control circuit controlling the transmissivity of the 2nd AMZ to decrease the monitoring result of the first monitor, and a third control circuit controlling the transmissivity of the 3rd AMZ to decrease the monitoring result of the third monitor.
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公开(公告)号：US20190006532A1
公开(公告)日：2019-01-03
申请号：US15748994
申请日：2016-07-28
IPC分类号： H01L31/028 , H01L31/036 , H01L31/105 , H01L31/109 , H01L31/0232
CPC分类号： H01L31/028 , H01L31/02327 , H01L31/036 , H01L31/105 , H01L31/1055 , H01L31/1085 , H01L31/109
摘要： Provided is an optical device in which an Si cap layer is provided on a Ge layer, and which is capable of effectively reducing dark current, while having a good effect on prevention of production line contamination by Ge. One embodiment of the optical device according to the present invention is provided with: a semiconductor layer which contains Ge and has a (001) surface and a facet surface between the (001) surface and a (110) surface; and a cap layer which is formed from Si, and which is formed on the (001) surface and the facet surface of the semiconductor layer. The ratio of the film thickness of the cap layer on the facet surface to the film thickness of the cap layer on the (001) surface is 0.4 or more; and the film thickness of the cap layer on the (001) surface is from 9 nm to 30 nm (inclusive).
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公开(公告)号：US20180284559A1
公开(公告)日：2018-10-04
申请号：US15940087
申请日：2018-03-29
IPC分类号： G02F1/225
摘要： Provided is a silicon-based electro-optic modulator that exhibits an improved carrier plasma effect which is capable of realizing a low current density, low power consumption, a high modulation rate, low-voltage driving and high-speed modulation in a sub-micron region. The electro-optic modulator includes a waveguide structure including an Si or SiGe crystal. The electric field direction of light that propagates inside the waveguide structure is set to be approximately parallel with the direction of the Si or SiGe crystal.
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