公开(公告)号：US20150188639A1

公开(公告)日：2015-07-02

申请号：US14575020

申请日：2014-12-18

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Tamotsu AKASHI

IPC: H04B10/564

CPC classification number: H04B10/50575 ,  H04B10/40

Abstract: An optical transmitter includes an optical modulator to modulate light output from a light source with a drive signal, a monitor to detect an average value and an alternating-current (AC) component of output light intensity of the optical modulator, and a controller to select one of a first bias control and a second bias control in accordance with an amplitude of the drive signal. The first bias control controls a bias voltage of the drive signal based on the average value, and the second bias control controls the bias voltage of the drive signal based on the AC component.

Abstract translation: 光发射机包括光调制器，用于利用驱动信号调制从光源输出的光;监视器，用于检测光调制器的输出光强度的平均值和交流（AC）分量;以及控制器选择 根据驱动信号的幅度的第一偏置控制和第二偏置控制中的一个。 第一偏置控制器基于平均值控制驱动信号的偏置电压，并且第二偏置控制器基于AC分量来控制驱动信号的偏置电压。

公开(公告)号：US20210318588A1

公开(公告)日：2021-10-14

申请号：US17158445

申请日：2021-01-26

Applicant: Fujitsu Optical Components Limited

Inventor： Kazuyuki WAKABAYASHI ,  Tamotsu AKASHI ,  Toshihiro OHTANI

IPC: G02F1/225 ,  G02F1/03

Abstract: An optical modulator includes an optical waveguide, a first slab and a second slab. The optical waveguide is formed by filling polymer in a slot portion formed between a first rail and a second rail disposed in parallel to the first rail. The first slab includes a first partial slab electrically connected to a first electrode and a second partial slab that electrically connects the first rail and the first partial slab. In the first slab, a thickness dimension of the second partial slab is set small compared with that of the first rail. The second slab includes a third partial slab electrically connected to a second electrode and a fourth partial slab that electrically connects the second rail and the third partial slab. In the second slab, a thickness dimension of the fourth partial slab is set small compared with that of the second rail.

公开(公告)号：US20140334831A1

公开(公告)日：2014-11-13

申请号：US14444010

申请日：2014-07-28

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Kenichi KAWAZOE ,  Yuji ISHII ,  Tamotsu AKASHI ,  Koji TERADA

IPC: H04B10/61

CPC classification number: H04B10/616 ,  A61M5/1456 ,  A61M5/1458 ,  A61M2209/082 ,  A61M2209/084 ,  H04B10/693

Abstract: An optical receiver receives coherent light. The optical receiver includes an amplitude adjuster, a signal processor, and a controller. The amplitude adjuster adjusts amplitude of an input signal to output an analog signal. The signal processor receives a digital signal generated from the analog signal output from the amplitude adjuster, extracts clock components from the digital signal, and after establishing synchronization between the clock components and data components, extracts the data components from the digital signal to process the data components. The controller sets amplitude of the analog signal to first amplitude before establishment of synchronization by the digital signal, and changes the set amplitude to second amplitude that is smaller than the first amplitude after the establishment of synchronization.

Abstract translation: 光接收机接收相干光。 光接收机包括幅度调节器，信号处理器和控制器。 幅度调节器调节输入信号的幅度以输出模拟信号。 信号处理器接收从幅度调节器输出的模拟信号产生的数字信号，从数字信号中提取时钟分量，在建立时钟分量和数据分量之间的同步之后，从数字信号中提取数据分量以处理数据 组件。 控制器在通过数字信号建立同步之前将模拟信号的幅度设置为第一幅度，并且在建立同步之后将设定幅度改变为小于第一幅度的第二幅度。

公开(公告)号：US20140328588A1

公开(公告)日：2014-11-06

申请号：US14254161

申请日：2014-04-16

Applicant: Fujitsu Optical Components Limited

Inventor： Yoshio SAKAI ,  Tamotsu AKASHI

IPC: H04B10/2507

CPC classification number: H04B10/63 ,  H04B10/6164

Abstract: An optical communication system includes an optical transmitter, and an optical receiver connected via a transmission line to the optical transmitter, in which system the optical transmitter transmits a continuous-wave light signal that enables beat detection when combined with a local oscillator signal in the optical receiver, and the optical receiver acquires a beat waveform through digital sampling by detecting the light signal using the local oscillator signal, performs frequency analysis on digitally sampled data having the beat waveform prior to demodulation, and controls the local oscillator frequency based upon the beat frequency.

Abstract translation: 光通信系统包括光发射机和经由传输线路连接到光发射机的光接收机，在该系统中，光发射机发射连续波光信号，当与光学发射机中的本地振荡器信号组合时，能够进行拍频检测 接收机，并且光接收机通过使用本地振荡器信号检测光信号通过数字采样获取拍频波形，对在解调之前具有拍频波形的数字采样数据进行频率分析，并且基于拍频来控制本地振荡器频率 。

公开(公告)号：US20130156444A1

公开(公告)日：2013-06-20

申请号：US13654913

申请日：2012-10-18

Applicant: Fujitsu Optical Components Limited

Inventor： Tamotsu AKASHI

IPC: H04B10/04

CPC classification number: G02F1/0123 ,  G02F2001/212 ,  H04B10/5057 ,  H04B10/50575

Abstract: In an optical modulation device, a driver applies a drive signal based on a data signal to a modulation unit, the modulation unit modulates the light input from an LD by the drive signal, and a bias control unit calculates a bias voltage value so as to make the f0 element closer to “0,” according to a detection result in a synchronization detection unit, and supplies a bias voltage of the calculated voltage value to the modulation unit. The bias control unit stops ABC control when the data signal is in a state different from a predefined state during the ABC control, and, after the stop of the ABC control, restarts the ABC control using, as an initial value, a bias voltage value calculated before the stop of the ABC control.

Abstract translation: 在光调制装置中，驱动器将基于数据信号的驱动信号施加到调制单元，调制单元通过驱动信号调制从LD输入的光，偏置控制单元计算偏置电压值，以便 根据同步检测单元中的检测结果使f0元件更接近于“0”，并将计算出的电压值的偏置电压提供给调制单元。 当在ABC控制期间数据信号处于与预定义状态不同的状态时，偏置控制单元停止ABC控制，并且在ABC控制停止之后，使用作为初始值的偏置电压值重新开始ABC控制 在ABC控制停止之前计算。