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公开(公告)号：US20190094573A1
公开(公告)日：2019-03-28
申请号：US16079096
申请日：2017-02-23
Inventor： Atsushi KANNO , Tetsuya KAWANISHI
Abstract: To provide a method whereby a bias voltage capable of easily realizing a required extinction ratio can be controlled by utilizing a high-extinction ratio modulator even when a generic AD converter/control board is used, and a device for realizing the method. In the present invention, the step quantity (variation quantity) ΔV of a control voltage is no more than 0.1 times the half-wave voltage Vπ [V]. For example, in the case of searching for the minimum point, the light intensity is measured when a bias that is larger by the step voltage ΔV and a bias that is smaller by the step voltage ΔV are applied, the current bias voltage being used as a reference, and the bias voltage is moved toward the smaller of the measured light intensities. The process of setting the moved bias voltage as a reference, comparing the light intensities for the bias points in both neighboring positions, and changing the reference bias voltage is then repeated. A configuration may be adopted whereby ΔV then gradually decreases in accordance with a predetermined algorithm.
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公开(公告)号：US20180356598A1
公开(公告)日：2018-12-13
申请号：US16001951
申请日：2018-06-07
Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, NATIONAL INSTITUTES OF NATURAL SCIENCES , NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
Inventor： Hitoshi KIUCHI , Atsushi KANNO , Tetsuya KAWANISHI
CPC classification number: G02B6/3586 , G01L1/246 , H04B10/12 , H04B10/506 , H04J14/02 , H04Q11/0001
Abstract: To provide a method for performing phase control of coherent two light wave signals while maintaining coherence in the state of the light signal, and a device which realizes such a method, there is provided, as illustrated in FIG. 1, a phase adjustment device 1 for two light waves including: a two light wave source 3, a wavelength separator 5, a first phase modulator 7, and a second phase modulator 9, whereby coherent two light waves are used as input signals to perform wavelength separation of those input signals thereafter to control optical phases of the respective light signals thereafter to multiplex them by using a multiplexer 11, thus to be able to obtain an output signal of which optical phase has been adjusted.
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Patent Agency Ranking
公开(公告)号：US20140086588A1
公开(公告)日：2014-03-27
申请号：US14035471
申请日：2013-09-24
Inventor： Tetsuya KAWANISHI , Atsushi KANNO
CPC classification number: H04B1/3827 , H04B10/118 , H04B10/25
Abstract: A high-speed communication control system is provided to resolve the problem of transmission delay, while a communication capacity is ensured.A communication system includes a transmission station 13 and a reception station 15. A communication system 17 includes an optical fiber line 19 and a wireless path 21 that connect the transmission station 13 to the reception station 15 so that information is transmitted and received. The transmission station 13 includes a communication control unit 11 that controls a communication path. The reception station 15 is able to communicate with the transmission station 13. The communication control unit 11 controls whether the information is transmitted to the reception station 15 via one of the optical fiber line 19 and the wireless path 21.
Abstract translation: 提供高速通信控制系统，以解决传输延迟的问题，同时确保通信容量。 通信系统包括发送站13和接收站15.通信系统17包括将发送站13连接到接收站15的光纤线路19和无线路径21，以便发送和接收信息。 发送站13包括控制通信路径的通信控制单元11。 接收站15能够与发送站13通信。通信控制单元11通过光纤线路19和无线路径21之一来控制信息是否被发送到接收站15。
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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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5.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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公开(公告)号：US20130195394A1
公开(公告)日：2013-08-01
申请号：US13754183
申请日：2013-01-30
Applicant: Sumitomo Osaka Cement Co., Ltd. , National Institute of Information and Communications Technology
Inventor： Youichi HOSOKAWA , Kaoru HIGUMA , Tetsuya KAWANISHI , Atsushi KANNO
IPC: G02F1/035
CPC classification number: G02F1/035 , G02F1/0123 , G02F1/225 , G02F2201/18 , H04B10/5053 , H04B10/541
Abstract: The optical modulator includes optical modulation units. The plurality of optical modulation units is disposed in parallel on the same substrate. One input waveguide branches off to be connected to the Mach-Zehnder type optical waveguide of each optical modulation unit, and an entire optical waveguide is formed such that outputs from the Mach-Zehnder type optical waveguides are combined and output through one output waveguide. A modulation signal with the same intensity is applied to a modulation electrode of each optical modulation unit. In at least some of the optical modulation units, mechanical structures including the modulation electrodes of the optical modulation units are configured such that an amplitude value of an optical output modulated by the modulation signal of the optical modulation unit is ½n (n is a natural number) of a maximum amplitude value in other optical modulation units.
Abstract translation: 光调制器包括光调制单元。 多个光学调制单元平行设置在同一基板上。 一个输入波导分支连接到每个光调制单元的马赫 - 曾德尔型光波导，并且形成整个光波导，使得来自马赫 - 策德尔型光波导的输出被组合并通过一个输出波导输出。 具有相同强度的调制信号被施加到每个光调制单元的调制电极。 在至少一些光调制单元中，包括光调制单元的调制电极的机械结构被配置为使得由光调制单元的调制信号调制的光输出的振幅值为½n（n为自然数 ）其他光调制单元中的最大振幅值。
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