公开(公告)号：US20190109668A1

公开(公告)日：2019-04-11

申请号：US16139503

申请日：2018-09-24

Applicant: Fujitsu Optical Components Limited

Inventor： Kiyotoshi NOHEJI ,  Masato NISHIHARA

IPC: H04J14/02 ,  H04L27/26 ,  H04B10/572

CPC classification number: H04J14/0278 ,  H04B10/506 ,  H04B10/548 ,  H04B10/572 ,  H04J14/0256 ,  H04J14/0298 ,  H04L27/2697

Abstract: An optical transmitter includes: a light source; a wavelength detecting unit configured to detect a wavelength of light emitted from the light source; a wavelength difference information generating unit configured to generate wavelength difference information representing a wavelength difference between a predetermined reference wavelength and a wavelength of the light detected by the wavelength detecting unit; a subcarrier count determination unit configured to determine a number of subcarriers to be used, based on the wavelength difference indicated by the wavelength difference information; a multi-valued level determination unit configured to determine, for each of the subcarriers, a multi-valued level which is a number of bits transmitted by a corresponding subcarrier of the subcarriers; a modulated signal generating unit configured to generate a modulated signal by modulating the subcarriers such that each of the subcarriers has the determined multi-valued level.

公开(公告)号：US10256938B2

公开(公告)日：2019-04-09

申请号：US15636058

申请日：2017-06-28

Applicant: Fujitsu Optical Components Limited

Inventor： Toshio Ishii

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

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.

公开(公告)号：US20190103922A1

公开(公告)日：2019-04-04

申请号：US16205483

申请日：2018-11-30

Applicant: Fujitsu Optical Components Limited

Inventor： Masaru Akizawa ,  Naoki Kuwata ,  Toshio Ishii

IPC: H04B10/69

Abstract: An optical receiver includes photodetectors each provided on a corresponding channel of multiple channels and configured to detect an optical signal at the corresponding channel, a delay adjuster circuit provided before the photodetectors and configured to adjust a delay time of an optical waveform of an incoming signal on at least one channel, and a processor that controls the delay time such that a change point of a first optical waveform of a first channel is away from a data decision timing of a second optical waveform of a second channel, using information acquired from an electrical signal produced after photo-detection.

公开(公告)号：US10243667B2

公开(公告)日：2019-03-26

申请号：US15946202

申请日：2018-04-05

Applicant: Fujitsu Optical Components Limited

Inventor： Sukeyuki Iwata ,  Toshiki Tanaka ,  Masato Nishihara ,  Naoki Kuwata

IPC: H04B10/04 ,  H04B10/588 ,  H04B10/61 ,  H04B10/54

Abstract: An optical transmitter includes an optical modulator configured to modulate light from a light source; and a processor configured to generate a drive signal that is input into the optical modulator. The processor inserts a bias control signal amplitude-modulated at a low frequency, into an analog signal at fixed intervals, to generate the drive signal.

公开(公告)号：US20190041581A1

公开(公告)日：2019-02-07

申请号：US16047498

申请日：2018-07-27

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki SUGIYAMA

IPC: G02B6/293

Abstract: A tunable light source includes a light source; a wavelength selecting device that selects, according to a control signal, output light with a specific wavelength from light output from the light source; and a wavelength monitor including a wavelength filter including multiple output ports corresponding to filtering paths through which the output light passes, and a light-receiving device that is disposed to face one of the output ports and receives light output from the one of the output ports. The wavelength filter is configured such that a maximum quantity of the light output from the one of the output ports facing the light-receiving device becomes greater than a maximum quantity of light output from another one of the output ports.

公开(公告)号：US10175553B2

公开(公告)日：2019-01-08

申请号：US15384854

申请日：2016-12-20

Applicant: Fujitsu Optical Components Limited

Inventor： Akira Ishii ,  Shinji Maruyama ,  Yuki Sakurai ,  Masaharu Doi ,  Osamu Oyama ,  Masami Kamioka

IPC: G02F1/225 ,  G02B6/126 ,  H01R9/05 ,  H01R12/51 ,  H01R12/59 ,  H01R12/79 ,  H01R24/38 ,  H01R12/70 ,  H01R24/50

Abstract: An optical module includes a driver that generates an electric signal and an optical modulator that has a notch in which at least a portion of the driver is accommodated and performs optical modulation using an electric signal generated by the driver. The optical module also includes a first connector electrically connected to the driver in the notch of the optical modulator. The optical module further includes a second connector provided on a surface of the notch of the optical modulator, the surface being opposed to the first connector. The second connector is electrically connected to the optical modulator. Furthermore, the optical module includes a coaxial pin that is connected to the first connector and the second connector and transmits the electric signal generated by the driver to the optical modulator.

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.

公开(公告)号：US10120209B2

公开(公告)日：2018-11-06

申请号：US15244438

申请日：2016-08-23

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/01 ,  G02F1/025

Abstract: An optical transmission device includes: an optical modulation package that includes a plurality of terminals that are exposed to an outside from a front surface thereof, and performs optical modulation on electrical signals input from the terminals; a flexible board that includes: an electrode arrangement part on which electrodes respectively connected to the terminals are arranged side by side to transmit the electrical signals to the terminals; and an arm part that projects more outward than an electrode located on an end of the electrode arrangement part and extends toward the optical modulation package to be locked to the optical modulation package; and an optical transmission member that transmits an optical signal obtained by the optical modulation performed by the optical modulation package.

公开(公告)号：US10107958B2

公开(公告)日：2018-10-23

申请号：US15131389

申请日：2016-04-18

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02B6/12 ,  G02B6/42

Abstract: A flexible substrate includes a first pad that extends from an end of the flexible substrate to a center of the flexible substrate, and at least a part of which is fixed to the first part; a second pad that extends from the end of the flexible substrate to the center at a position adjacent to the first pad, and at least a part of which is fixed to the first part; a signal line that connects a tip of the first pad and the second part and that is narrower in width than the first pad; and a coverlay that covers an area where the signal line is arranged and that includes a protrusion protruding, at a position at which the first pad is arranged, toward the end of the flexible substrate relative to the area where the signal line is arranged.

公开(公告)号：US10103809B2

公开(公告)日：2018-10-16

申请号：US15822673

申请日：2017-11-27

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: H04B10/572 ,  H04B10/079 ,  G02B6/12

Abstract: A wavelength tunable light source includes a light source, a wavelength monitor circuit configured to receive light emitted from the light source, and a processor that controls the light source based upon an output value of the wavelength monitor circuit, wherein the wavelength monitor circuit has a wavelength filter with a periodic transmission spectrum, and three photo detectors connected to outputs of the wavelength filter, and wherein the processor is configured to calculate a ratio of photo-detection normalized with two of three quantities of light received at the three photo detectors and control electric current input to the light source such that a calculated ratio of photo-detection approaches a target ratio at a designated wavelength.