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公开(公告)号：US20230120581A1
公开(公告)日：2023-04-20
申请号：US17910891
申请日：2021-03-05
Inventor： Yuki YOSHIDA , Naokatsu YAMAMOTO
IPC: H04B10/61
Abstract: A system for estimating an imbalance between electrical-optical responses of an in-phase (I) channel and a quadrature (Q) channel in an optical amplitude and phase modulator (optical IQ modulator) includes an optical detector (PD), an analog-digital converter (ADC), and an imbalance operation unit that estimates an imbalance between electrical-optical responses of an I channel and a Q channel in the optical IQ modulator, wherein the imbalance operation unit includes an input signal information receiving unit that receives information regarding a first modulation signal, and an intensity information receiving unit that receives intensity information of the digitalized output signal from the ADC, and the imbalance operation unit estimates an imbalance between electrical-optical responses of an I channel and a Q channel in the optical IQ modulator using information regarding a first modulation signal and intensity information of the digitalized output signal.
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公开(公告)号：US20210364642A1
公开(公告)日：2021-11-25
申请号：US17278306
申请日：2019-06-03
Inventor： Keizo INAGAKI , Toshimasa UMEZAWA , Naokatsu YAMAMOTO , Tetsuya KAWANISHI
IPC: G01S17/894 , G01S7/48 , G02F1/295
Abstract: [Problem] To provide a camera with high sensitivity even if an output to the outside is weak. [Solution] This camera includes a light source 3, a demultiplexing unit 5 which demultiplexes light from the light source 3 into first demultiplexed light and second demultiplexed light, a first modulator 7 which modulates the first demultiplexed light to obtain a modulated signal, an emission unit 9 which emits the modulation signal modulated by the first modulator 7, and a phase imparting means 11 which imparts a plurality of types of phase shifts to the second demultiplexed light to obtain phase-imparted local light. The camera further includes a multiplexing unit 13 which multiplexes light incident from the outside of the camera and the phase-imparted local light and obtains multiplexed light, a light receiving element 17 which detects the multiplexed light, and includes a light receiving unit 15, and an analysis processing unit 19 which, on the basis of the multiplexed light received by the light receiving element 17, analyzes the position of a subject or the distance between the subject and the camera.
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公开(公告)号：US20210167855A1
公开(公告)日：2021-06-03
申请号：US17267002
申请日：2019-06-03
Inventor： Ryo TAKAHASHI , Tetsuya KAWANISHI , Naokatsu YAMAMOTO
IPC: H04B10/275 , H04J14/02 , H04L12/40 , H04L12/46
Abstract: [Problem] To provide a novel optical network which can be used as an in-vehicle optical backbone network and exhibits high capacity, low delay, low power consumption, low noise and low cost. [Solution] An optical network system, wherein: a signal processing unit 13 controls a light source 11, and generates an optical signal which includes an information portion to be read by one of the gateway units 5a, and a continuous light portion to be written thereby; a network control unit 15 generates an electrical signal which designates a gate y unit 5a and pertains to whether the information incorporated into the optical signal is to be read or written; and when designated by the electrical signal, each of the gateway units 5a transfers information to and from an electronic control unit 7, and reads information included in the corresponding optical signal or writes information in the continuous light portion, on the basis of the information included in the electrical signal about whether to read or write information.
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Patent Agency Ranking
公开(公告)号：US20190250484A1
公开(公告)日：2019-08-15
申请号：US16336467
申请日：2017-09-12
Inventor： Takahide SAKAMOTO , Naokatsu YAMAMOTO , Atsushi MATSUMOTO
CPC classification number: G02F2/02 , G02F1/0123 , G02F2203/56
Abstract: To provide an optical comb generation device and an optical comb signal generation method capable of stably generating an optical comb signal having an optical frequency interval exceeding the drive electric signal band of a modulator. When light output from a first optical modulator 5 and a second optical modulator 7 is multiplexed in a multiplexing unit 13, the first optical modulator 5 and the second optical modulator 7 cancel the even-ordered components or odd-ordered components included in the light output from the first optical modulator 5 and the second optical modulator 7 and, when light output from a third optical modulator 9 and a fourth optical modulator 11 is multiplexed in the multiplexing unit 13, the third optical modulator 9 and the fourth optical modulator 11 cancel the even-ordered components or odd-ordered components included in the light output from the third optical modulator 9 and the fourth optical modulator 11, wherein the same components cancelled in the light output from the first optical modulator 5 and the second optical modulator 7 are cancelled.
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公开(公告)号：US20200044745A1
公开(公告)日：2020-02-06
申请号：US16494766
申请日：2018-03-07
Inventor： Toshimasa UMEZAWA , Takahide SAKAMOTO , Atsushi KANNO , Naokatsu YAMAMOTO , Tetsuya KAWANISHI
IPC: H04B10/60 , H01L27/144 , G02B6/42 , H04J14/04 , H04B10/2581
Abstract: To provide a photodetector which enables reception of massively parallel optical communication, and with which a large volume of data for multi-mode transmission or multi-core transmission can be received instantaneously at once. A photodetector comprising a two-dimensional photodetector array in which a plurality of photodetectors 9 are arranged in a two-dimensional array, and which includes a wire 12 having a width of not more than 4 μm between the plurality of photodetectors. Each of the photodetectors has a light reception area with a side measuring not more than 100 μm. The plurality of photodetectors arranged in a two-dimensional array are spaced apart from each other by not less than 20 μm.
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6.发明申请公开(公告)号：US20190097734A1
公开(公告)日：2019-03-28
申请号：US16080661
申请日：2017-02-23
Inventor： Keizo INAGAKI , Tetsuya KAWANISHI , Atsushi KANNO , Naokatsu YAMAMOTO
Abstract: To provide a method and device capable of easily measuring the CMRR vs. frequency characteristics of an optical receiver. Light having a measurement frequency (ω [hz]) is split into two different paths, and a first optical two-tone signal, which is signal light and has a frequency difference (ω−Δω [hz]), and a second optical two-tone signal, which is local light and has a frequency difference (ω-Δω [hz]), are obtained and input into a coherent receiver to be measured, wherein electrical signals output from the receiver are measured to obtain both the ratio of the intensity of a signal component having the frequency ω−Δω [hz] to the intensity of a signal component having the frequency ω [hz], which corresponds to the CMRR on the signal light side, and the ratio of the intensity of a signal component having the frequency ω+Δω [hz] to the intensity of the signal component having the frequency ω [hz], which corresponds to the CMRR on the local light side.
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公开(公告)号：US20190020319A1
公开(公告)日：2019-01-17
申请号：US16069457
申请日：2017-01-10
Inventor： Toshimasa UMEZAWA , Kouichi AKAHANE , Atsushi MATSUMOTO , Atsushi KANNO , Naokatsu YAMAMOTO , Tetsuya KAWANISHI
Abstract: There is provided a photoelectric converter that converts an optical signal into an electrical signal for amplification, the photoelectric converter including a photoelectric conversion element that converts the optical signal into an electrical signal and outputs the electrical signal from an output terminal, a high-frequency amplifier that includes an input terminal of an electrical signal output from the output terminal and a DC cut-off capacitor which is disposed at an output stage of the input terminal and is serially connected to the input terminal and that amplifies the electrical signal, and an inductance element that is disposed between a bias power supply applying bias voltage or bias current to the photoelectric conversion element and the input terminal and which is connected in parallel to the DC cut-off capacitor.
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8.发明申请公开(公告)号：US20180375291A1
公开(公告)日：2018-12-27
申请号：US16008261
申请日：2018-06-14
Inventor： Atsushi MATSUMOTO , Kouichi AKAHANE , Naokatsu YAMAMOTO
Abstract: A semiconductor optical device 1 includes an active layer 4 provided on a substrate 2, a clad layer 5 provided on the active layer 4, and a contact layer 7 provided on the clad layer 5. The contact layer 7 contains a first impurity and a second impurity different from the first impurity. A semiconductor light source includes the active layer 4 provided on the substrate 2, the clad layer 5 provided on the active layer 4, and the contact layer 7 provided on the clad layer 5. The contact layer 7 contains the first impurity and the second impurity different from the first impurity.
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