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公开(公告)号：US10122467B2
公开(公告)日：2018-11-06
申请号：US15409731
申请日：2017-01-19
Applicant: Fujitsu Optical Components Limited
Inventor： Hiroshi Nishimoto
IPC: H04B10/00 , H04B10/516 , G08C23/04 , H04B10/532 , H04B10/572
Abstract: An optical transmitter that transmits an optical signal includes a dither superimposing circuit configured to generate a dither signal, the dither signal being used to control an operation of the optical transmitter to output the optical signal, and a control circuit configured to control intermittent superimposition of the dither signal onto a target to be controlled.
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公开(公告)号：US10122507B2
公开(公告)日：2018-11-06
申请号：US15172289
申请日：2016-06-03
Applicant: Fujitsu Optical Components Limited
Inventor： Hiroshi Nishimoto
IPC: H04B10/10 , H04B10/08 , H04B10/516 , H04B10/564 , H04L5/00 , H04B10/50 , H04L27/00 , H04L27/20 , H04L27/36 , H04L27/18
Abstract: An optical transmitter has an optical modulator with a Mach-Zehnder interferometer, a pilot signal generator configured to generate a pilot signal to be superimposed on a drive signal for driving the optical modulator or on a substrate bias voltage applied to the optical modulator, and a controller configured to detect a ratio between a pilot component and a direct current component contained in a light output from the optical modulator and control at least one of an amplitude of the drive signal and a level of the substrate bias voltage such that the ratio becomes a constant value.
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Patent Agency Ranking
公开(公告)号：US09069224B2
公开(公告)日：2015-06-30
申请号：US14541897
申请日：2014-11-14
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Hiroshi Nishimoto , Hiroshi Kuwahara
IPC: H04J14/02 , H04B10/04 , H04J14/08 , H04B10/02 , H04J14/06 , G02F1/295 , G02F1/225 , H04B10/50 , G02F1/01 , G02F1/21
CPC classification number: G02F1/2257 , G02F1/0123 , G02F2001/212 , H04B10/50572 , H04B10/50575
Abstract: An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator.
Abstract translation: 光调制器包括：调制器，包括设置在具有电光效应的半导体衬底中的光波导和电极，以根据偏置电压和调制信号向光波导施加电场; 驱动电路，用于根据输入信号产生调制信号; 叠加器，用于将参考信号叠加在所述偏置电压上，所述参考信号的频率低于所述调制信号; 以及控制器，用于基于从调制器生成的调制光信号中提取的参考信号的频率分量来控制与调制器的调制方向正交的方向上的偏置电压。
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公开(公告)号：US09448458B2
公开(公告)日：2016-09-20
申请号：US14950198
申请日：2015-11-24
Applicant: Fujitsu Optical Components Limited
Inventor： Hiroshi Nishimoto , Akihiro Toya
CPC classification number: G02F1/2255 , G02F1/0123 , G02F1/2257 , G02F2001/212 , H04B10/50575
Abstract: An optical communication device has a pair of Mach-Zehnder optical modulators; a voltage monitor configured to monitor a voltage component acquired by optical-to-electric conversion of combined light output from the Mach-Zehnder optical modulators; a power monitor configured to monitor a power component acquired by square law detection of the optical-to-electric converted combined light from the Mach-Zehnder optical modulators; a first controller configured to control a substrate bias voltage or a driving amplitude applied to one of two waveguides of each of the Mach-Zehnder optical modulators based upon an output of the power monitor, and a second controller configured to control the substrate bias voltage or the driving amplitude applied to the other of the two waveguides of each of the Mach-Zehnder optical modulator based upon an output of the voltage monitor.
Abstract translation: 光通信装置具有一对马赫 - 策德尔光学调制器; 电压监视器，被配置为监视从马赫 - 策德尔光调制器输出的组合光的光电转换获得的电压分量; 功率监视器，被配置为监视通过来自马赫 - 策德尔光学调制器的光电转换组合光的平方律检测获得的功率分量; 第一控制器，被配置为基于功率监视器的输出来控制施加到每个马赫 - 曾德尔光学调制器的两个波导中的一个波导的衬底偏置电压或驱动振幅;以及第二控制器，被配置为控制衬底偏置电压或 基于电压监视器的输出，驱动振幅施加到每个Mach-Zehnder光学调制器的两个波导中的另一个的另一个。
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公开(公告)号：US09450679B2
公开(公告)日：2016-09-20
申请号：US14283699
申请日：2014-05-21
Applicant: Fujitsu Optical Components Limited
Inventor： Hiroshi Nishimoto
CPC classification number: H04B10/616 , H04B10/40
Abstract: An optical receiver includes: an optical receiving device configured to generate an analog received signal that represents a received modulated optical signal; an A/D converter configured to generate a digital received signal from the analog received signal; an E/O circuit configured to generate an optical digital signal from the digital received signal; an O/E circuit configured to generate an electric digital signal from the optical digital signal; and a digital signal processor configured to recover a data signal from the electric digital signal.
Abstract translation: 光接收器包括：光接收装置，被配置为产生表示接收到的调制光信号的模拟接收信号; A / D转换器，被配置为从模拟接收信号产生数字接收信号; 被配置为从数字接收信号产生光学数字信号的E / O电路; O / E电路，被配置为从光学数字信号产生电数字信号; 以及配置成从电数字信号中恢复数据信号的数字信号处理器。
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公开(公告)号：US20160147129A1
公开(公告)日：2016-05-26
申请号：US14950198
申请日：2015-11-24
Applicant: Fujitsu Optical Components Limited
Inventor： Hiroshi Nishimoto , AKIHIRO TOYA
CPC classification number: G02F1/2255 , G02F1/0123 , G02F1/2257 , G02F2001/212 , H04B10/50575
Abstract: An optical communication device has a pair of Mach-Zehnder optical modulators; a voltage monitor configured to monitor a voltage component acquired by optical-to-electric conversion of combined light output from the Mach-Zehnder optical modulators; a power monitor configured to monitor a power component acquired by square law detection of the optical-to-electric converted combined light from the Mach-Zehnder optical modulators; a first controller configured to control a substrate bias voltage or a driving amplitude applied to one of two waveguides of each of the Mach-Zehnder optical modulators based upon an output of the power monitor, and a second controller configured to control the substrate bias voltage or the driving amplitude applied to the other of the two waveguides of each of the Mach-Zehnder optical modulator based upon an output of the voltage monitor.
Abstract translation: 光通信装置具有一对马赫 - 策德尔光学调制器; 电压监视器，被配置为监视从马赫 - 策德尔光调制器输出的组合光的光电转换获得的电压分量; 功率监视器，被配置为监视通过来自马赫 - 策德尔光学调制器的光电转换组合光的平方律检测获得的功率分量; 第一控制器，被配置为基于功率监视器的输出来控制施加到每个马赫 - 曾德尔光学调制器的两个波导中的一个波导的衬底偏置电压或驱动振幅;以及第二控制器，被配置为控制衬底偏置电压或 基于电压监视器的输出，驱动振幅施加到每个Mach-Zehnder光学调制器的两个波导中的另一个的另一个。
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公开(公告)号：US09244328B2
公开(公告)日：2016-01-26
申请号：US14541864
申请日：2014-11-14
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Hiroshi Nishimoto , Hiroshi Kuwahara
IPC: H04J14/02 , H04B10/04 , H04J14/08 , H04B10/02 , G02F1/295 , G02F1/225 , H04B10/50 , G02F1/01 , G02F1/21
CPC classification number: G02F1/2257 , G02F1/0123 , G02F2001/212 , H04B10/50572 , H04B10/50575
Abstract: An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator.
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