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：US20230333439A1

公开(公告)日：2023-10-19

申请号：US18165039

申请日：2023-02-06

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki SUGIYAMA

IPC: G02F1/225 ,  G02F1/21 ,  G02F1/01 ,  H04J14/06

CPC classification number: G02F1/2252 ,  G02F1/212 ,  G02F1/0121 ,  H04J14/06 ,  G02F2201/12 ,  G02F2201/17 ,  G02F2203/50

Abstract: An optical modulator includes a first shifter and a second shifter. The first shifter includes a first waveguide through which first light passes, and a first electrode that causes power according to a drive voltage to act on the first waveguide. The first shifter shifts a phase of the first light passing through the first waveguide in accordance with the drive voltage applied to the first electrode. The second shifter includes a second waveguide through which second light passes, and a second electrode that causes power according to a drive voltage to act on the second waveguide. The second shifter shifts a phase of the second light passing through the second waveguide in accordance with the drive voltage applied to the second electrode. The second shifter is constituted to have a smaller amount of phase shift according to a predetermined amount of drive voltage than the first shifter.

公开(公告)号：US20230324726A1

公开(公告)日：2023-10-12

申请号：US18085995

申请日：2022-12-21

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki SUGIYAMA

IPC: G02F1/065

CPC classification number: G02F1/065

Abstract: A device includes a waveguide, an electrode that has a coplanar structure, and an interaction unit that is constituted such that the interaction unit is inserted into a slot of the waveguide, that is formed using an electro-optical polymer, and that acts on light passing through the waveguide according to a voltage received from the electrode. The device includes an excessive length unit that extends to an input side and an output side of the interaction unit and that is formed using the electro-optical polymer, and an other waveguide that is not connected to the waveguide and that is formed by inserting the excessive length unit into the slot located between a first doped layer that is connected to a ground electrode disposed parallel to the excessive length unit and a second doped layer that is connected to a signal electrode disposed parallel to the excessive length unit.

公开(公告)号：US20230238774A1

公开(公告)日：2023-07-27

申请号：US18065954

申请日：2022-12-14

Applicant: Fujitsu Optical Components Limited

Inventor： Hirotomo IZUMI ,  Suguru AKIYAMA ,  Ayahito UETAKE ,  Seimi SASAKI

IPC: H01S5/10 ,  H01S5/14 ,  H01S5/50 ,  H01S5/026

CPC classification number: H01S5/1014 ,  H01S5/141 ,  H01S5/50 ,  H01S5/026

Abstract: A wavelength tunable laser device includes: a first mirror; a second mirror; an optical amplifier provided between the first mirror and the second mirror; a wavelength tunable filter provided between the first mirror and the second mirror; and an optical waveguide coupling the optical amplifier and the wavelength tunable filter. The optical waveguide includes a first waveguide formed with a first width and a second waveguide formed with a second width wider than the first width.

公开(公告)号：US20230231632A1

公开(公告)日：2023-07-20

申请号：US18077829

申请日：2022-12-08

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Koji OTSUBO ,  Kazumasa TAKABAYASHI ,  Masaki SUGIYAMA ,  Shuntaro MAKINO

IPC: H04B10/69 ,  H04B10/50 ,  H04B10/516

CPC classification number: H04B10/69 ,  H04B10/503 ,  H04B10/5161 ,  H01S5/50

Abstract: An optical device includes an optical coupler that inputs an optical signal received from a light source, a semiconductor optical amplifier that amplifies the optical signal received from the optical coupler, and a light receiving element that receives spontaneous emission light received from the semiconductor optical amplifier. The optical coupler includes a first input port to which the optical signal received from the light source is input, a second input port that is connected to an input stage of the light receiving element and that is different from the first input, and an output port that is connected to an input stage of the semiconductor optical amplifier, and that outputs optical signal received from the first input port to the semiconductor optical amplifier. The light receiving element receives, via the output port and the second input port, spontaneous emission light received from the semiconductor optical amplifier.

公开(公告)号：US20230194801A1

公开(公告)日：2023-06-22

申请号：US18071994

申请日：2022-11-30

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki SUGIYAMA

IPC: G02B6/42 ,  G02B6/43

CPC classification number: G02B6/4206 ,  G02B6/43

Abstract: An optical device is formed on an optical integrated circuit (IC) chip. The optical device includes: an optical circuit, a first grating coupler, a second grating coupler, a first 1×2 coupler, and a second 1×2 coupler. The first 1×2 coupler is equipped with a first optical port provided at a single-port end and a second optical port and a third optical port provided at a two-port end. The second 1×2 coupler is equipped with a fourth optical port provided at a single-port end and a fifth optical port and a sixth optical port provided at a two-port end. The first grating coupler is coupled to the first optical port. The second optical port is coupled to the optical circuit. The third optical port is coupled to the fourth optical port. The fifth optical port is coupled to the second grating coupler.

公开(公告)号：US11662522B2

公开(公告)日：2023-05-30

申请号：US17454734

申请日：2021-11-12

Applicant: Fujitsu Optical Components Limited

Inventor： Akira Oka

IPC: G02B6/27 ,  G02B6/122 ,  G02B6/14 ,  G02B6/126 ,  G02B6/12

CPC classification number: G02B6/2773 ,  G02B6/126 ,  G02B6/1228 ,  G02B6/14 ,  G02B6/2726 ,  G02B2006/12097

Abstract: An optical waveguide device includes first and second waveguides formed parallel to each other. The first waveguide includes a first rib and a first slab. The first slab is formed in a region between the first rib and the second waveguide. The second waveguide includes a second rib, a second slab and a third slab. The second rib is provided between the second slab and the third slab. The first and second slabs are integrally formed. At one end of the optical waveguide device, a first effective refractive index that indicates an effective refractive index of a TEi mode in the first waveguide is higher than a second effective refractive index that indicates an effective refractive index of a TEj mode in the second waveguide. At another end, the first effective refractive index is lower than the second effective refractive index.

公开(公告)号：US11616156B2

公开(公告)日：2023-03-28

申请号：US16854489

申请日：2020-04-21

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Nami Yasuoka

IPC: H01L31/052 ,  H01L31/0525 ,  H01L31/0745 ,  H01L31/054 ,  H01L23/34

Abstract: An optical semiconductor element includes an optical receiver including a first semiconductor layer, a heater for heating the first semiconductor layer; and a monitor. A first semiconductor layer that absorbs light and generates electric carriers; a heater for heating the first semiconductor layer; and a monitor including a second semiconductor layer in which dark current is changed by heat generated by the heater.

公开(公告)号：US20230090619A1

公开(公告)日：2023-03-23

申请号：US17882147

申请日：2022-08-05

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki SUGIYAMA

IPC: G02F1/01

Abstract: An optical device includes a substrate, a dielectric substance laminated on the substrate, an optical waveguide surrounded by the dielectric substance, a heater electrode that is disposed above the optical waveguide and that is surrounded by the dielectric substance, and a trench. The trench includes a plurality of split trenches each of which is formed in a hollow segmented shape in the dielectric substance and in which the split trenches are disposed in parallel with the heater electrode. The split trenches are disposed in parallel with the heater electrode such that an area of the dielectric substance located between an end of each of the split trenches and a side surface of the heater electrode is gradually expanded.

公开(公告)号：US20230082895A1

公开(公告)日：2023-03-16

申请号：US17882992

申请日：2022-08-08

Applicant: Fujitsu Optical Components Limited

Inventor： Takeshi Matsumoto

IPC: G02B6/42

Abstract: Optical device, that is provided between optical output element and optical propagation element, includes: first lens circuit configured to include one or more lenses through which output light of the optical output element passes; and second lens circuit configured to include one or more lenses and guide output light of the first lens circuit to the optical propagation element. When F11 represents distance between the optical output element and the first lens circuit, F12 represents distance between the first lens circuit and first beam waist position of the first lens circuit, F21 represents distance between the first beam waist position and the second lens circuit, and F22 represents distance between the second lens circuit and second beam waist position of the second lens circuit, F11 and F22 are equal to each other and F12 and F21 are equal to each other.