公开(公告)号：US20220260866A1

公开(公告)日：2022-08-18

申请号：US17568261

申请日：2022-01-04

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/035

Abstract: An optical device includes a substrate, a layered structure provided on the substrate and including an intermediate layer, an optical waveguide formed of a thin crystal film having an electro-optic effect, and a buffer layer stacked in this order, and an electrode provided on or above the buffer layer and configured to apply a direct current voltage to the optical waveguide. The resistivity of the intermediate layer is higher than the resistivity of the buffer layer.

公开(公告)号：US11372181B2

公开(公告)日：2022-06-28

申请号：US17245883

申请日：2021-04-30

Applicant: Fujitsu Optical Components Limited

Inventor： Takatoshi Yagisawa ,  Tsuyoshi Gamo

IPC: H04B10/00 ,  G02B6/42

Abstract: An optical module includes: a housing formed of a conductor that is insertable and removable with respect to an opening portion of an apparatus; a substrate arranged in an internal space of the housing; and a blocking unit that divides the internal space in which the substrate is arranged into two spaces. The blocking unit includes: a first conductor pattern formed on one surface of the substrate; a second conductor pattern formed on another surface of the substrate; a plurality of vias that penetrate through the substrate and connect the first conductor pattern and the second conductor pattern; a first auxiliary member formed of a conductor that comes into contact with the first conductor pattern and the housing; and a second auxiliary member formed of a conductor that comes into contact with the second conductor pattern and the housing.

公开(公告)号：US20220163827A1

公开(公告)日：2022-05-26

申请号：US17496304

申请日：2021-10-07

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki SUGIYAMA

IPC: G02F1/035 ,  G02F1/225 ,  G02F1/21

Abstract: An optical device has a silicon (Si) substrate, a ground electrode, a lithium niobate (LN) optical waveguide, and a signal electrode. The ground electrode is an electrode that is at ground potential and that is layered on the Si substrate. The LN optical waveguide is an optical waveguide that is formed by a thin film LN substrate that is layered on the ground electrode. The signal electrode is an electrode that is disposed at a position opposite the ground electrode with the LN optical waveguide interposed therebetween and that applies a high-frequency signal.

公开(公告)号：US11320715B2

公开(公告)日：2022-05-03

申请号：US16897432

申请日：2020-06-10

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/225 ,  G02F1/21

Abstract: An optical device includes an optical modulator formed on an optical IC chip. A shape of the IC chip is a rectangle or a parallelogram. The optical modulator includes an interferometer, wiring patterns, a first polymer pattern, and a second polymer pattern. The interferometer includes an optical waveguide that is formed in a direction from a first edge to a second edge of the optical IC chip. The wiring patterns are formed parallel to the optical waveguide. The first polymer pattern is formed along the first edge or the second edge. The second polymer pattern is connected to the first polymer pattern and formed on the optical waveguide without overlapping the wiring patterns.

公开(公告)号：US11320595B2

公开(公告)日：2022-05-03

申请号：US17141288

申请日：2021-01-05

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02B6/293 ,  G02F1/21 ,  G02B6/12 ,  G02F1/225

Abstract: An optical device includes: a substrate; an optical waveguide that forms a Mach-Zehnder interferometer; a signal electrode; and a ground electrode. The optical waveguide is placed between the signal electrode and the ground electrode. An electric field is generated in a direction along a surface of the substrate when a voltage is applied between the signal electrode and the ground electrode. The optical waveguide includes a first waveguide through which input light propagates, a curved waveguide which is optically coupled to the first waveguide, and a second waveguide which is optically coupled to the curved waveguide. The signal electrode includes first and second electrodes that are respectively placed near the first and second waveguides. An electric signal is supplied to the first electrode, and an inverted electric signal is supplied to the second electrode.

公开(公告)号：US20220104388A1

公开(公告)日：2022-03-31

申请号：US17481492

申请日：2021-09-22

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Kazuya SASAKI ,  Takatoshi YAGISAWA ,  Tsutomu OHTSU ,  Masami KAMIOKA

IPC: H05K7/20 ,  H05K7/14

Abstract: An optical communication module includes: a circuit board; optical communication devices that are provided on an upper surface side of the circuit board; a case that accommodates the circuit board and the optical communication devices; and a heatsink that is attached to the case. The optical communication devices include a first device and a second device. The first device is located closer to an inlet opening for cooling air for cooling the heatsink than the second device is. A height from the circuit board to a top of the first device is greater than a height from the circuit board to a top of the second device. The heatsink is not equipped with a cooling fin in a first region where the first device is provided, and the heatsink is equipped with a cooling fin in a second region where the second device is provided.

公开(公告)号：US20220004031A1

公开(公告)日：2022-01-06

申请号：US17334040

申请日：2021-05-28

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/035

Abstract: An optical device includes: a ground electrode having a ground potential; a thin film optical waveguide formed by a thin film substrate stacked on the ground electrode; a signal electrode that is arranged at a position facing the ground electrode across the thin film optical waveguide and that transmits a high frequency signal; and a dielectric that covers at least a part of an exposed surface of the signal electrode.

公开(公告)号：US20210382233A1

公开(公告)日：2021-12-09

申请号：US17241190

申请日：2021-04-27

Applicant: Fujitsu Optical Components Limited

Inventor： Takeshi BABA

IPC: G02B6/14 ,  G02B6/126

Abstract: A mode converter for converting mode of propagating light is provided. The mode converter includes: a mode order conversion unit that includes an input-side first rib unit, an output-side first rib unit that extends along the input-side first rib unit, and a first slab unit arranged between the input-side first rib unit and the output-side first rib unit; and a rib channel conversion unit that includes an output-side second rib unit that is in contact with the output-side first rib unit, a second slab unit that is in contact with the first slab unit and a side surface of the output-side second rib unit, and a third slab unit that is in contact with another side surface of the output-side second rib unit.

公开(公告)号：US20210325760A1

公开(公告)日：2021-10-21

申请号：US17165562

申请日：2021-02-02

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro Makino ,  Yoshinobu Kubota ,  Yasuhiro Ohmori ,  Masaharu Doi ,  Teruo Kurahashi ,  Shintaro Takeuchi

IPC: G02F1/225 ,  G02F1/03 ,  G02F1/035

Abstract: An optical waveguide device includes a substrate on which an intermediate layer, a thin-film LN layer of lithium niobate, and a buffer layer are stacked; an optical waveguide formed in the thin-film LN layer; and a plurality of electrodes near the optical waveguide. The intermediate layer and the buffer layer contain a same material of a metal element of any one of group 3 of group 18 of a periodic table of elements.

公开(公告)号：US11153007B2

公开(公告)日：2021-10-19

申请号：US16789084

申请日：2020-02-12

Applicant: FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Masaki Sugiyama

IPC: H04B10/077 ,  H04B10/25 ,  H04B10/50 ,  G02B6/42

Abstract: An optical device has an optical transmitter circuit formed in a substrate, a first port configured to output an optical signal generated by the optical transmitter circuit from an edge of the substrate during services and to input a test light from the edge of the substrate during a test, and a photodetector configured to detect the test light input from the first port.