公开(公告)号：US09344199B2

公开(公告)日：2016-05-17

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: H04B10/06 ,  H04B10/61 ,  H04B10/69

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，并且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：US20230102995A1

公开(公告)日：2023-03-30

申请号：US17877259

申请日：2022-07-29

Applicant: Fujitsu Optical Components Limited

Inventor： Tetsuji YAMABANA ,  Koji Terada

IPC: H04B10/564 ,  H04B10/40 ,  H04B10/516 ,  H04B10/61

Abstract: An optical coherent transceiver includes a transmitter and a receiver that share laser light. The transmitter includes a pair of parent MZIs in a modulator, which are parent MZIs configured to perform quadrature modulation on the laser light according to a bias voltage, and two pairs of child MZIs in the modulator, which are child MZIs configured to perform phase modulation on the laser light according to the bias voltage. The transmitter includes a control circuit configured to control the bias voltage to be applied to the parent MZIs and the child MZIs. The control circuit is configured to, when turning light output of the transmitter off, with input of a data signal being set off, control the bias voltage such that a phase difference between the parent MZIs is around 90 degrees and a phase difference between the child MZIs in each of the pairs is 180 degrees.