公开(公告)号：US10718899B2

公开(公告)日：2020-07-21

申请号：US16370421

申请日：2019-03-29

Applicant: FUJIKURA LTD.

Inventor： Kazuhiro Goi

IPC: G02B6/12 ,  G02B6/122 ,  H04J14/02

Abstract: An optical device includes: a first port group P including n ports Pi; a second port Q; and a wavelength multiplexer/demultiplexer disposed between the first port group P and the second port Q. In a case where light beams Li of predetermined different n wavelengths λi corresponding to the respective ports Pi are inputted to the wavelength multiplexer/demultiplexer, the wavelength multiplexer/demultiplexer combines the light beams Li into light L and outputs the light L to the second port Q. In a case where light L′ is inputted to the second port Q, the wavelength multiplexer/demultiplexer separates the light L′ into light beams L′i of the wavelengths λi and outputs the light beams L′i to the corresponding ports Pi.

公开(公告)号：US10365507B2

公开(公告)日：2019-07-30

申请号：US15977050

申请日：2018-05-11

Applicant: FUJIKURA LTD.

Inventor： Norihiro Ishikura ,  Kazuhiro Goi

IPC: G02F1/01

Abstract: Provided is a semiconductor optical integrated circuit which consumes less electric power than a conventional semiconductor optical integrated circuit. A semiconductor optical integrated circuit (1) includes a semiconductor layer (13) in which (i) an optical waveguide (LG) including heated section I1 through I3 and (ii) heater parts H1 and H2 are provided. The optical waveguide (LG) meanders such that the heated sections I1 through I3 are juxtaposed to one another. Each heater part Hi is arranged between a heated section Ii and a heated section Ii+1 which are adjacent to each other.

公开(公告)号：US10267995B2

公开(公告)日：2019-04-23

申请号：US15689121

申请日：2017-08-29

Applicant: FUJIKURA LTD.

Inventor： Shinichi Sakamoto ,  Kazuhiro Goi ,  Norihiro Ishikura

IPC: G02F1/35 ,  G02B6/293 ,  G02B6/10 ,  G02B6/125 ,  G02B6/126 ,  G02F1/035

Abstract: In order to reduce a high frequency loss of a substrate-type optical waveguide without facilitating, in a low frequency domain, a reflection by an entrance end of a traveling-wave electrode, the substrate-type optical waveguide includes a coplanar line, provided on an upper surface of an upper cladding, which includes (i) a traveling-wave electrode connected to a P-type semiconductor region and (ii) an earth conductor connected to an N-type semiconductor region. The traveling-wave electrode and the earth conductor are provided so that a distance D therebetween decreases as a distance from an entrance end of the traveling-wave electrode increases.

公开(公告)号：US10261385B2

公开(公告)日：2019-04-16

申请号：US15850791

申请日：2017-12-21

Applicant: FUJIKURA LTD.

Inventor： Kazuhiro Goi

IPC: G02F1/035 ,  G02F1/225 ,  G02F1/01 ,  H04B10/50 ,  G02F1/017 ,  G02F1/21

Abstract: A light modulation element constituted by a substrate type optical waveguide has a Mach-Zehnder interferometer; and a traveling wave electrode having a signal electrode arranged at least between a first phase modulator and a second phase modulator and electrically connected to both of the first phase modulator and the second phase modulator. A polarity of a semiconductor region of the first phase modulator connected to the signal electrode and a plurality of a semiconductor region of the second phase modulator connected to the signal electrode are different from each other.

公开(公告)号：US20180341126A1

公开(公告)日：2018-11-29

申请号：US15977050

申请日：2018-05-11

Applicant: FUJIKURA LTD.

Inventor： Norihiro Ishikura ,  Kazuhiro Goi

IPC: G02F1/01

CPC classification number: G02F1/0147 ,  G02F2201/06 ,  G02F2202/10 ,  G02F2203/21

Abstract: Provided is a semiconductor optical integrated circuit which consumes less electric power than a conventional semiconductor optical integrated circuit. A semiconductor optical integrated circuit (1) includes a semiconductor layer (13) in which (i) an optical waveguide (LG) including heated section I1 through I3 and (ii) heater parts H1 and H2 are provided. The optical waveguide (LG) meanders such that the heated sections I1 through I3 are juxtaposed to one another. Each heater part Hi is arranged between a heated section Ii and a heated section Ii+1 which are adjacent to each other.

公开(公告)号：US20180180965A1

公开(公告)日：2018-06-28

申请号：US15850791

申请日：2017-12-21

Applicant: FUJIKURA LTD.

Inventor： Kazuhiro Goi

IPC: G02F1/225 ,  G02F1/01 ,  H04B10/50 ,  G02F1/035

CPC classification number: G02F1/2257 ,  G02F1/0121 ,  G02F1/01708 ,  G02F1/035 ,  G02F1/2255 ,  G02F2001/212 ,  G02F2201/127 ,  G02F2203/05 ,  H04B10/505 ,  H04B10/50575

Abstract: A light modulation element constituted by a substrate type optical waveguide has a Mach-Zehnder interferometer; and a traveling wave electrode having a signal electrode arranged at least between a first phase modulator and a second phase modulator and electrically connected to both of the first phase modulator and the second phase modulator. A polarity of a semiconductor region of the first phase modulator connected to the signal electrode and a plurality of a semiconductor region of the second phase modulator connected to the signal electrode are different from each other.

公开(公告)号：US09817294B2

公开(公告)日：2017-11-14

申请号：US14748895

申请日：2015-06-24

Applicant: FUJIKURA LTD.

Inventor： Kazuhiro Goi ,  Hiroki Ishihara ,  Kensuke Ogawa ,  Kenji Oda ,  Hiroyuki Kusaka ,  Ryokichi Matsumoto ,  Hitoshi Uemura

IPC: G02F1/035 ,  G02F1/225 ,  G02F1/025 ,  G02F1/21 ,  G02B6/293 ,  G02B6/122 ,  G02B6/12 ,  G02B6/125

CPC classification number: G02F1/2257 ,  G02B6/122 ,  G02B6/1228 ,  G02B6/125 ,  G02B6/29353 ,  G02B6/29355 ,  G02B2006/12097 ,  G02B2006/12142 ,  G02B2006/12147 ,  G02B2006/12159 ,  G02F1/025 ,  G02F1/218 ,  G02F1/2255 ,  G02F2001/212 ,  G02F2201/58

Abstract: An optical modulation device configured of a planar optical waveguide, includes: a light incidence unit which allows light to be incident on the planar optical waveguide; a Mach-Zehnder interferometer which includes a first optical splitter section branching the light incident on the light incidence unit, two arm portions guiding the light branched by the first optical splitter section, a phase modulation unit linearly disposed on each of the two arm portions, and a first optical coupler section combining the light guided from the two arm portions; a light launching unit which launches the light combined by the first optical coupler section from the planar optical waveguide; and a traveling-wave electrode which includes an input unit and an output unit, and applies a voltage to the phase modulation unit.

公开(公告)号：US20170176681A1

公开(公告)日：2017-06-22

申请号：US15450942

申请日：2017-03-06

Applicant: FUJIKURA LTD.

Inventor： Hiroyuki Kusaka ,  Ryokichi Matsumoto ,  Kazuhiro Goi ,  Kensuke Ogawa

IPC: G02B6/126 ,  G02B6/27 ,  G02B6/12 ,  G02F1/225 ,  G02B6/125 ,  G02B6/122

CPC classification number: G02B6/126 ,  G02B6/12 ,  G02B6/12004 ,  G02B6/122 ,  G02B6/1228 ,  G02B6/125 ,  G02B6/13 ,  G02B6/278 ,  G02B2006/12123 ,  G02F1/225 ,  G02F2001/212

Abstract: An optical waveguide element includes a core and a cladding that is made of SiO2. When ng_i_TE is a group refractive index of a TE0 polarized wave in the i-th waveguide counted from a light incidence plane of the core and ng_i_TM is a group refractive index of a TM0 polarized wave in the i-th waveguide, the length L_i[m] of the i-th waveguide satisfies a predetermined relation.