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公开(公告)号：US12068421B2
公开(公告)日：2024-08-20
申请号：US17619070
申请日：2020-06-15
IPC分类号： H01L31/0224 , H01L31/0232 , H01L31/105
CPC分类号： H01L31/022408 , H01L31/02327 , H01L31/105
摘要： A light shielding structure of an optical circuit of the present invention uses a part of the structure of the light reception element itself to suppress stray light. A stepped electrode that covers an upper surface and side surface of a first semiconductor layer constituting a light absorption portion of the light reception element is formed at a height substantially equal to that of an optical waveguide in the optical circuit, and the light absorption portion of the light reception element is shielded from stray light by a wall-shaped or column-shaped wiring electrode extending substantially perpendicularly to a surface layer of the optical circuit. The light shielding structure of the present invention uses a part of the configuration of the light reception element, is formed integrally with the light reception element, and also has an aspect of the invention of the light reception element.
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公开(公告)号：US20230216653A1
公开(公告)日：2023-07-06
申请号：US18000621
申请日：2021-05-27
发明人： Masahiro TACHIBANA , Mami MIKAMI , Yuki YOSHIDA
IPC分类号： H04L7/00
CPC分类号： H04L7/0016
摘要： A data transfer circuit (40) according to the invention includes a memory (41) configured to write data in accordance with a write pointer in synchronization with a first clock, and read out the data in accordance with a readout pointer in synchronization with a second clock, a clock generation circuit (44) configured to generate the second clock by multiplying a reference clock by a rational number N, a frequency error estimation circuit (42) configured to estimate a frequency error between the first clock and the second clock based on a change amount of a pointer difference between the write pointer and the readout pointer, and an adjustment circuit (43) configured to output, as an adjustment multiple ΔN, a value obtained by dividing the estimated frequency error by a frequency of the reference clock. The clock generation circuit (44) generates the second clock by multiplying the reference clock by a rational number (N+ΔN) using the adjustment multiple ΔN output from the adjustment circuit (43). A data transfer circuit capable of speeding up clock synchronization can be provided.
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公开(公告)号：US11494165B2
公开(公告)日：2022-11-08
申请号：US16959986
申请日：2018-12-18
发明人： Kenji Kawai , Ryo Awata , Kazuhito Takei , Masaaki Iizuka
摘要： An arithmetic circuit includes a LUT generation circuit (1) that, when coefficients c[n] (n=1, . . . , N) are paired two by two, outputs a value calculated for each of the pairs, and distributed arithmetic circuits (2-m) that calculate values z[m] that are sums of products of data x[m, n] of a data set X[m] containing M pairs of data x[m, n] and the coefficients c[n], in parallel for each of the M pairs. The distributed arithmetic circuit (2-m) includes binomial distributed arithmetic circuits that, for each of the pairs, calculate sums of products of a value obtained by pairing N data x[m, n] corresponding to the circuit two by two and a value obtained by pairing the coefficients c[n] two by two, and a figure matching circuit that matches a number of decimal figures of the sums with a predetermined number of decimal figures.
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公开(公告)号：US11432005B2
公开(公告)日：2022-08-30
申请号：US16452025
申请日：2019-06-25
发明人： Akiko Shimazaki , Ken Nakamura , Takayuki Onishi , Takashi Sano
IPC分类号： H04N19/00 , H04N19/593 , H04N19/176 , H04N19/159 , H04N19/14 , H04N19/107 , H04N19/11 , H04N19/126 , H04N19/182 , H04N19/61 , H04N19/625
摘要： A computation unit subtracts a prediction image from an input image. An orthogonal transformation unit applies orthogonal transformation to an output of the computation unit. A quantization unit quantizes an output of the orthogonal transformation unit. An encoding unit encodes an output of the quantization unit. A prediction mode determination unit determines a prediction mode from the input image. The prediction mode is different according to types of an I-picture, a P-picture and a B-picture.
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公开(公告)号：US11333950B2
公开(公告)日：2022-05-17
申请号：US17295669
申请日：2019-08-30
发明人： Atsushi Kusayama , Yasuyuki Nanaumi , Kiyoshi Kido , Yuji Akahori
摘要： An optical module of a configuration that ensures use of commercially available electronic components and reduction of the number of current generation circuits and electric wirings. The optical module includes an electronic component mounted on a separate board from a light wave circuit board provided with an optical component such as an optical switch, and they are each electrically connected by wire bonding. For this reason, the optical module can use a commercially available electronic component. In addition, the module has a configuration in which heaters of optical switches, which do not simultaneously flow currents, are grouped and a current from one current generation circuit is supplied to any one of the heaters in the group by means of one electrical switch. For this reason, the optical module does not have to be prepared with the same number of electrical switches and current generation circuits as the number of heaters.
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公开(公告)号：US11287578B2
公开(公告)日：2022-03-29
申请号：US16982491
申请日：2019-03-26
摘要： There is provided a small MCS with the number of leads reduced by half as compared with the conventional configuration. A multicast switch according to the present invention is formed on a substrate, comprising: M input ports, N output ports; M×N optical switch units (optical SU); optical waveguides optically connecting the M input ports, M×N optical SU, and N output ports; and leads connected to the respective M×N optical SU. A multicast switch is configured such that by activating one optical SU, an optical signal input to an input port associated with the activated optical SU is output from an output port associated with the activated optical SU. The M×N optical SU include at least a gate switch and a main switch. In each optical SU, the gate switch and the main switch are connected to the common lead.
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公开(公告)号：US20220019030A1
公开(公告)日：2022-01-20
申请号：US17295669
申请日：2019-08-30
发明人： Atsushi KUSAYAMA , Yasuyuki NANAUMI , Kiyoshi KIDO , Yuji AKAHORI
IPC分类号： G02B6/35
摘要： An optical module of a configuration that ensures use of commercially available electronic components and reduction of the number of current generation circuits and electric wirings. The optical module includes an electronic component mounted on a separate board from a light wave circuit board provided with an optical component such as an optical switch, and they are each electrically connected by wire bonding. For this reason, the optical module can use a commercially available electronic component. In addition, the module has a configuration in which heaters of optical switches, which do not simultaneously flow currents, are grouped and a current from one current generation circuit is supplied to any one of the heaters in the group by means of one electrical switch. For this reason, the optical module does not have to be prepared with the same number of electrical switches and current generation circuits as the number of heaters.
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公开(公告)号：US11228366B2
公开(公告)日：2022-01-18
申请号：US17269023
申请日：2020-02-03
IPC分类号： H04B10/071 , H04B10/50 , H04B10/588 , H04B10/61
摘要： A process of estimating a transfer function or an inverse transfer function of the optical transmitter from first data obtained by the optical receiver when a first known signal is transmitted from the transmitter to the receiver, and a temporary transfer function or a temporary inverse transfer function of the optical receiver, is performed for multiple frequency offsets between the optical transmitter and the optical receiver. At this time, the transfer function or the inverse transfer function of the optical transmitter is estimated by comparing the first data obtained by compensating at least one or none of a temporary transfer function of the optical receiver and transmission path characteristics detected in the receiver, with a first known signal before transmission to which what is not compensated for the first data between the temporary transfer function of the optical receiver and the transmission path characteristic is added.
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公开(公告)号：US11217705B2
公开(公告)日：2022-01-04
申请号：US16433739
申请日：2019-06-06
发明人： Makoto Shimizu , Hiroki Itoh , Tadao Ishibashi , Isamu Kotaka
IPC分类号： H01L29/06 , H01L29/861 , H01Q23/00 , H01L29/36 , H01L29/205 , H01L29/66
摘要： A semiconductor element capable of adjusting a barrier height ϕBn and performing zero-bias operation and impedance matching with an antenna for improving detection sensitivity of high-frequency RF electric signals, a method of manufacturing the same, and a semiconductor device having the same. In the semiconductor element, a concentration of InGaAs (n-type InGaAs layer) is intentionally set to be high over a range for preventing the “change of the barrier height caused by the bias” described above up to a deep degeneration range. An electron Fermi level (EF) increases from a band edge of InGaAs (n-type InGaAs layer) to a band edge of InP (InP depletion layer).
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公开(公告)号：US20210344424A1
公开(公告)日：2021-11-04
申请号：US17273544
申请日：2019-10-07
发明人： Tomohiro TAKAMUKU , Mitsuteru YOSHIDA , Tsutomu TAKEYA , Kazuhito TAKEI , Katsuichi OYAMA , Tomoharu SEMBOKU
IPC分类号： H04B10/2569 , H04B10/61
摘要： First compensation circuitry includes a first digital filter compensating a phase difference between a phase of a symbol of a received signal and a sampling timing, and first filter coefficient calculation circuitry calculating a filter coefficient of the first digital filter as a first filter coefficient. Second filter coefficient calculation circuitry calculates, as a second filter coefficient, a filter coefficient for adaptive equalization that compensates distortion due to temporally changing polarization dispersion, based on an output of the first digital filter. Coefficient combination circuitry combines the first filter coefficient and the second filter coefficient. Second compensation circuitry includes a second digital filter which uses a filter coefficient combined by the coefficient combination circuitry and performs a compensation of the phase difference between the phase of the symbol of the received signal and the sampling timing, and a process of the adaptive equalization at the same time.
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