公开(公告)号：US20210376558A1

公开(公告)日：2021-12-02

申请号：US17401190

申请日：2021-08-12

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masayoshi NISHITA ,  Hiroyuki ISHII ,  Toshihito SUZUKI

IPC: H01S5/026 ,  H01S5/20 ,  G02B6/12

Abstract: A semiconductor optical integrated device in which a forward-bias optical device and a semiconductor laser are monolithically integrated on a semiconductor substrate, includes: a passive waveguide portion that is arranged between the forward-bias optical device and the semiconductor laser; and a ground electrode that is arrange on a lower surface of the semiconductor substrate. Further, the semiconductor laser includes a mirror having a length on a side closer to the forward-bias optical device, the forward-bias optical device includes a forward-bias optical-device electrode on a side opposite to a side in contact with the semiconductor substrate, the passive waveguide portion includes a passive waveguide electrode on a side opposite to a side in contact with the semiconductor substrate, and the passive waveguide electrode is electrically connected to the ground electrode.

公开(公告)号：US20240006847A1

公开(公告)日：2024-01-04

申请号：US18465228

申请日：2023-09-12

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Akihisa KONDO ,  Masayoshi KIMURA ,  Jun MIURA ,  Masayoshi NISHITA

IPC: H01S5/0687 ,  H01S5/0683

CPC classification number: H01S5/0687 ,  H01S5/06837

Abstract: A laser apparatus includes: a laser unit including a light source unit configured to change a frequency of laser light to be output; and a monitor unit configured to acquire a monitor value corresponding to a frequency equivalent amount corresponding to the frequency of the laser light; and a control unit configured to control the frequency of the laser light by supplying a control amount to the laser unit. The monitor unit at least includes: a first frequency filter and a second frequency filter; a first detection unit; and a second detection unit. The control unit is configured to acquire a target frequency, acquire a first ratio and a second ratio, set, as a monitor value corresponding to the frequency of the laser light, one of the first ratio, the second ratio, a third ratio, acquire a target value, and control the control amount.

公开(公告)号：US20210249836A1

公开(公告)日：2021-08-12

申请号：US17168257

申请日：2021-02-05

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masayoshi NISHITA ,  Masahiro YOSHIDA ,  Etsuji KATAYAMA

IPC: H01S5/022 ,  H01S5/024 ,  G02B6/42

Abstract: An optical device includes: a base having first and second ends in first and second directions, respectively, and extends in the first direction; an optical module having a head adjacent to the base and is positioned close to the second end and a neck protruding from the head and is thinner than the head; a substrate attached on the base arranged with the head; and a pressing member having a first fixing portion fixed to the base, a second fixing portion fixed to the base, a first extension portion extending from the first fixing portion, a second extension portion extending from the second fixing portion, and a pressing portion provided in at least one of the first and the second extension portions and presses the head against the base.

公开(公告)号：US20200373735A1

公开(公告)日：2020-11-26

申请号：US16991086

申请日：2020-08-12

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masayoshi NISHITA ,  Atsushi YAMAMOTO

IPC: H01S5/06 ,  H01S5/024 ,  H01S5/00 ,  H04B10/50 ,  H04B10/572 ,  H01S5/0687

Abstract: A method for controlling a wavelength of an optical module, includes: a laser light source unit emitting a laser beam; a wavelength filter having a periodical transmission characteristic with respect to a wavelength of light; a temperature controller on which the wavelength filter is placed and that adjusting a temperature of the wavelength filter; a heat generating body placed on the temperature controller; and a control device controlling the wavelength of the laser beam emitted from the laser light source unit and control the transmission characteristic of the wavelength filter based on an intensity of the laser beam transmitted through the wavelength filter, the method including changing at least one of a target value of the wavelength control of the laser beam and a target value of the control of the wavelength filter based on a current value of the heat generating body.

公开(公告)号：US20170237499A1

公开(公告)日：2017-08-17

申请号：US15432290

申请日：2017-02-14

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masayoshi NISHITA ,  Kengo MURANUSHI ,  Atsushi YAMAMOTO

IPC: H04B10/50

CPC classification number: H04B10/506 ,  H04B10/503 ,  H04B10/572 ,  H04J14/0224 ,  H04J14/0226 ,  H04J14/0227

Abstract: A method of controlling a wavelength of a wavelength tunable laser module includes: referring to data of measured frequencies and wavelength filter control values at two or more points for each basic frequency channel, the data being stored in a memory of a controller; selecting the basic frequency channel closest to a frequency of laser light that a laser light source is instructed to emit; calculating a first wavelength filter control value for providing the instructed frequency of laser light from the data of the measured frequencies allocated to the basic frequency channel closest to the instructed frequency and the wavelength filter control values; and controlling the transmission characteristic of a wavelength filter using the first wavelength filter control value.