公开(公告)号：US20140348500A1

公开(公告)日：2014-11-27

申请号：US14258287

申请日：2014-04-22

Applicant: Fujitsu Optical Components Limited

Inventor： Toshio ISHII

IPC: H04B10/079 ,  H04B10/40 ,  H04B10/60

CPC classification number: H04B10/695

Abstract: An optical receiver includes a first discriminator in which an optimal point of a slice level is set and that compares a received signal to the slice level and discriminately outputs the received signal; a second discriminator that is connected in parallel to the first discriminator, compares the received signal to a slice level, and discriminately outputs the received signal; and a computing device that variably controls the slice level of the first and the second discriminators, respectively. The computing device executes a first process of setting the slice level of the first discriminator to be a predetermined slice level, calculating a pseudo error rate obtained when the slice level of the second discriminator is caused to variably scan, and setting the slice level of the first discriminator within a range in which the error rate does not vary.

Abstract translation: 光接收机包括：第一鉴频器，其中设置限幅电平的最佳点，并将接收信号与限幅电平进行比较，并区分输出接收信号; 与第一鉴别器并联连接的第二鉴频器将接收信号与限幅电平进行比较，并区分输出接收信号; 以及分别可变地控制第一和第二鉴别器的限幅电平的计算装置。 计算装置执行将第一鉴别器的限幅电平设置为预定限幅电平的第一处理，计算当第二鉴别器的限幅电平被引起可变扫描时获得的伪错误率，并且设置 在错误率不变的范围内的第一鉴别器。

公开(公告)号：US20240006846A1

公开(公告)日：2024-01-04

申请号：US18200936

申请日：2023-05-23

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Toshio ISHII

IPC: H01S5/0683 ,  H01S5/04 ,  H01S5/06 ,  H01S5/062 ,  H04B10/54

CPC classification number: H01S5/06832 ,  H01S5/041 ,  H01S5/0617 ,  H01S5/062 ,  H04B10/54

Abstract: An optical device includes a generator, a light emitter, a modulator, an optical amplifier, a current source, a storage, and a controller. The generator generates an electric signal of a multilevel amplitude modulation method. The light emitter emits laser light. The modulator modulates the laser light using the electric signal and outputs an optical signal. The optical amplifier optically amplifies the modulated optical signal according to a drive current. The current source adjusts the drive current to be supplied to the optical amplifier. The storage previously stores an information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the drive current. The controller acquires, from the storage, the input-output characteristics corresponding to the drive current value of the drive current supplied to the optical amplifier and controls the electric signal based on the acquired input-output characteristics.

公开(公告)号：US20220317377A1

公开(公告)日：2022-10-06

申请号：US17592801

申请日：2022-02-04

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Kenta KANNARI ,  Toshio ISHII

IPC: G02B6/293 ,  G02F1/21 ,  G02B6/12

Abstract: An optical transmission apparatus includes an emitter that emits an optical signal in accordance with a bias current, and a Mach-Zehnder optical modulator that optically modulates the optical signal in accordance with an electrical signal. The optical modulator includes a detector that detects a temperature inside the optical modulator, and a controller that, when detecting activation of a power supply, controls the temperature inside the optical modulator such that the temperature detected by the detector reaches a target temperature.

公开(公告)号：US20230098306A1

公开(公告)日：2023-03-30

申请号：US17897867

申请日：2022-08-29

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Toshio ISHII ,  Naoki KUWATA

IPC: H04B10/079 ,  H04J14/02 ,  H04B10/60 ,  H04B10/40

Abstract: An optical receiver includes an optical amplifier that amplifies a received optical signal containing multiple wavelengths, a monitor circuit that monitors light intensities of the demultiplexed optical signal, a processor, and a memory having information representing a relationship between a total incident light intensity of the optical signal incident onto the optical amplifier and gains of the optical amplifier for the respective wavelengths. The processor repeats first calculation for determining the gains of the respective wavelengths from the memory, based on a drive current for driving the optical amplifier and an estimation value of the total incident light intensity of the optical signal, second calculation for calculating the incident light intensities of the respective wavelengths of the optical signal based on the gains and the monitored light intensities, and third calculation to calculate the total incident light intensity of the optical signal, until the total incident light intensity converges.

公开(公告)号：US20180006756A1

公开(公告)日：2018-01-04

申请号：US15636058

申请日：2017-06-28

Applicant: Fujitsu Optical Components Limited

Inventor： Toshio ISHII

IPC: H04J14/02 ,  H04B10/69 ,  H04B10/40

CPC classification number: H04J14/0221 ,  H04B10/40 ,  H04B10/671 ,  H04B10/69 ,  H04B10/6911

Abstract: An optical receiver includes a demultiplexer configured to demultiplex, for each channel, optical signals input through a plurality of channels, a photoelectric converter having a number of light receivers corresponding to the plurality of channels, the photoelectric converter being configured to convert an optical signal into an electric signal for each channel, a monitor circuit configured to monitor, for each channel, an amplitude characteristic of the optical signal converted into the electric signal by the photoelectric converter, and a control circuit configured to control, based on a monitored result of the monitor circuit, a bias voltage to be applied to the light receiver such that an amount of variability in the amplitude characteristic between the channels is minimum or falls within a predetermined range.