公开(公告)号：US09634768B2

公开(公告)日：2017-04-25

申请号：US14811940

申请日：2015-07-29

Applicant: Fujitsu Optical Components Limited

Inventor： Akihiro Toya

IPC: H04B10/2507 ,  H04B10/50

CPC classification number: H04B10/50575

Abstract: An optical communication device has a Mach-Zehnder optical modulator; a monitor configured to monitor a modulated light output from the optical modulator; a first controller configured to set a substrate bias voltage or an amplitude of a drive signal applied to the first waveguide of a waveguide pair of the optical modulator to a desired level that provides a first modulation index; and a second controller configured to control a substrate bias voltage or an amplitude of the drive signal applied to the second waveguide of the waveguide pair based upon an output signal from the monitor such that a second modulation index for the second waveguide becomes the same or closer to the first modulation index set for the first waveguide.

公开(公告)号：US09762331B2

公开(公告)日：2017-09-12

申请号：US14810537

申请日：2015-07-28

Applicant: Fujitsu Optical Components Limited

Inventor： Akihiro Toya

IPC: H04B10/516 ,  H04B10/50 ,  H04B10/556

CPC classification number: H04B10/5057 ,  H04B10/50575 ,  H04B10/5561

Abstract: An optical communication apparatus includes an optical modulator having a Mach-Zehnder interferometer with a pair of waveguides and configured to modulate a phase of light emitted from a light source, a first controller configured to control a first substrate bias voltage or an amplitude of a first drive signal applied to a first waveguide of the waveguide pair of the optical modulator based upon an output of the optical modulator or a wavelength of the light source; and a second controller configured to control a second substrate bias voltage or an amplitude of a second drive signal applied to a second waveguide of the waveguide pair of the optical modulator independently from the first controller, based upon the output of the optical modulator or the wavelength of the light source.

公开(公告)号：US09762330B2

公开(公告)日：2017-09-12

申请号：US14810541

申请日：2015-07-28

Applicant: Fujitsu Optical Components Limited

Inventor： Akihiro Toya

IPC: H04B10/25 ,  H04B10/50 ,  H04B10/588

CPC classification number: H04B10/5053 ,  H04B10/50575 ,  H04B10/588

Abstract: An optical communication device includes an optical modulator of a Mach-Zehnder type, a low frequency superimposing circuit configured to superimpose a low frequency signal on a substrate bias voltage applied to the optical modulator, a monitor configured to monitor a modulated light output from the optical modulator, and a substrate bias controller configured to control the substrate bias voltage based upon a low frequency component contained in a monitor signal output from the monitor.

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

IPC: G02F1/035 ,  G02F1/225 ,  G02F1/01 ,  G02F1/21

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。

公开(公告)号：US09007675B2

公开(公告)日：2015-04-14

申请号：US13663758

申请日：2012-10-30

Applicant: Fujitsu Optical Components Limited

Inventor： Akihiro Toya ,  Tsuyoshi Morishita

IPC: G02F1/01 ,  H04B10/50 ,  H04B10/556

CPC classification number: G02F1/01 ,  G02F1/0123 ,  H04B10/50572 ,  H04B10/50575 ,  H04B10/50577 ,  H04B10/5561

Abstract: In an optical modulation device, a first drive signal and a first bias signal are applied to a phase modulation unit, a second drive signal and a second bias signal are applied to a phase modulation unit, and a third bias signal is applied to a π/2 phase shift unit. A control unit adjusts the third bias signal in a first adjustment period, adjusts the first drive signal and the first bias signal in a second adjustment period next to the first adjustment period, and adjusts the second drive signal and the second bias signal in a third adjustment period next to the second adjustment period. The control unit starts the second adjustment period before a gap between the current value of an adjustment reference signal and a target value is filled, and starts the third adjustment period before a gap in the second adjustment period is filled.

Abstract translation: 在光调制装置中，将第一驱动信号和第一偏置信号施加到相位调制单元，将第二驱动信号和第二偏置信号施加到相位调制单元，并将第三偏置信号施加到＆pgr ; / 2相移单元。 控制单元在第一调整周期中调整第三偏置信号，在与第一调整周期相邻的第二调整周期中调整第一驱动信号和第一偏置信号，并且在第三调整周期中调整第二驱动信号和第二偏置信号 调整期在第二个调整期之后。 控制单元在填充调整基准信号的当前值和目标值之间的间隙之前开始第二调整周期，并且在第二调整周期中的间隙被填满之前开始第三调整周期。