公开(公告)号：US20180026426A1

公开(公告)日：2018-01-25

申请号：US15708994

申请日：2017-09-19

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Yasumasa KAWAKITA ,  Yasutaka HIGA ,  Norihiro IWAI ,  Tatsuro KUROBE

IPC: H01S5/14 ,  H01S5/00 ,  G02B5/28 ,  H01S5/06 ,  H01S5/026 ,  H01S5/0687

CPC classification number: H01S5/142 ,  G02B5/284 ,  H01S5/0085 ,  H01S5/02415 ,  H01S5/026 ,  H01S5/0261 ,  H01S5/0612 ,  H01S5/06256 ,  H01S5/0687 ,  H01S5/1014 ,  H01S5/1021 ,  H01S5/1032 ,  H01S5/1209 ,  H01S5/2275

Abstract: A wavelength tunable laser device includes: a laser cavity formed of a grating and a reflecting mirror including a ring resonator filter; a gain portion; and a phase adjusting portion. The grating creates a first comb-shaped reflection spectrum. The ring resonator filter includes a ring-shaped waveguide and two arms and creates a second comb-shaped reflection spectrum having peaks of a narrower full width than peaks in the first comb-shaped reflection spectrum at a wavelength interval different from that of the first comb-shaped reflection spectrum. One of the peaks in the first comb-shaped reflection spectrum and one of the peaks in the second comb-shaped reflection spectrum are overlapped on a wavelength axis, and a spacing between cavity modes is narrower than the full width at half maximum of the peaks in the first comb-shaped reflection spectrum.

公开(公告)号：US20210367405A1

公开(公告)日：2021-11-25

申请号：US17392878

申请日：2021-08-03

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masaki WAKABA ,  Yasutaka HIGA

IPC: H01S5/227 ,  H01S5/024 ,  H01S5/026 ,  H01S5/22

Abstract: A semiconductor device includes: a mesa portion that has a semiconductor layered structure, and that extends in a predetermined direction; an extending portion that extends along the mesa portion and that is separated by trench grooves arranged respectively on both sides of the mesa portion; insulating portions that are made from an insulating material, and are arranged in the respective trench grooves; and a conductive portion that is arranged on an upper side of the mesa portion. Further, at least one of the insulating portions adheres intimately to the mesa portion, and forms a gap between the at least one of the insulating portions and the extending portion in at least a part of an extending direction of the mesa portion, and the conductive portion is arranged across at least one of the insulating portions and the mesa portion.

公开(公告)号：US20210367401A1

公开(公告)日：2021-11-25

申请号：US17392899

申请日：2021-08-03

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Yasutaka HIGA ,  Yasumasa KAWAKITA ,  Kazuaki KIYOTA

IPC: H01S5/10 ,  H01S5/12 ,  H01S5/026

Abstract: An optical functional device includes: first and second optical couplers each including a multi-mode interferometer waveguide portion having a first end portion and a second end portion, two units of first input/output ports and two units of second input/output ports; and first and second arc-shaped waveguides each optically connecting one of the first and second input/output ports of the first and second optical coupler and one of the first and second input/output ports of the second optical coupler, respectively. Further, the first optical coupler, the second optical coupler, the first arc-shaped waveguide, and the second arc-shaped waveguide constitute a ring resonator, and each of the multi-mode waveguide portions of the first optical coupler and the second optical coupler have a narrow portion, an average width of the narrow portion in a longitudinal direction being narrower than widths at the first end portion and the second end portion.