Patents Assigned to Fujitsu Optical Components Limited
  • Publication number: 20240077673
    Abstract: An optical chip includes a chip area located on a wafer, and an optical circuit arranged in the chip area. The optical chip includes a first waveguide that is connected to a first operational fiber, a second waveguide, and a first coupler that includes a first port that is connected to the first waveguide and the second waveguide and a second port that is connected to the optical circuit. Furthermore, the optical chip includes a first trench that is formed on a surface of the chip area, that is connected to the second waveguide, and in which a first test purpose fiber is inserted.
    Type: Application
    Filed: July 28, 2023
    Publication date: March 7, 2024
    Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki SUGIYAMA
  • Publication number: 20240072900
    Abstract: An optical amplifier includes a first path and a second path, and an amplification unit that is arranged on one of the first path and the second path. The amplifier includes a first switch that is arranged on an input stage of the amplification unit, and that switches a third path that connects between the first path and the amplification unit or a fourth path that connects between the second path and the amplification unit. The amplifier includes a second switch that is arranged on an output stage of the amplification unit and that switches a fifth path that connects between the first path and the amplification unit or a sixth path that connects between the second path and the amplification unit. The first switch switches the third path over to the fourth path, and the second switch switches the fifth path to the sixth path.
    Type: Application
    Filed: June 30, 2023
    Publication date: February 29, 2024
    Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Daisuke MATSUKAWA
  • Patent number: 11914189
    Abstract: An optical device includes a plurality of first Si waveguides that split and output an optical signal received from an input unit, plurality of LN waveguides that are included in a LN modulator and that transmit the optical signals that are split and output by the first Si waveguides, and a plurality of second Si waveguides that multiplex and output the associated optical signals that are output from the plurality of respective LN waveguides. The device includes an output unit that outputs the optical signal multiplexed by the second Si waveguides, and a plurality of Mach-Zehnder interferometers disposed on each of waveguides connected by the first Si waveguides, the LN waveguides, and the second Si waveguides, respectively. When there are differences among waveguide lengths of the LN waveguides, the device is configured such that the optical path lengths of the waveguides for the respective Mach-Zehnder interferometers are equalized.
    Type: Grant
    Filed: October 12, 2021
    Date of Patent: February 27, 2024
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki Sugiyama
  • Patent number: 11914233
    Abstract: An optical device includes an optical waveguide, a buffer layer that is layered on the optical waveguide, and an opening that is formed at least in the buffer layer above a part near a side surface of the optical waveguide. The optical device further includes an electrode that is layered in the opening and that is configured to apply a signal to the optical waveguide and a silicon layer that is layered on the buffer layer excluding the opening.
    Type: Grant
    Filed: April 7, 2022
    Date of Patent: February 27, 2024
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki Sugiyama
  • Patent number: 11914202
    Abstract: The optical module includes a housing, a lid that closes an opening of the housing, an optical component arranged inside the housing, and a printed circuit board arranged on a front surface of the lid outside the housing so as to be used as a board on which a control circuit that controls the optical component is mounted. The optical module further includes a side electrode that is provided on a side surface of the housing and configured to be electrically connected to an electrode of the optical component; and a flexible substrate that provides electrical connection between the side electrode and an electrode of the control circuit. The optical module can be miniaturized by integrating the optical component and the control circuit.
    Type: Grant
    Filed: February 16, 2021
    Date of Patent: February 27, 2024
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Takuya Nakao
  • Patent number: 11901939
    Abstract: An optical receiver includes an optical amplifier that amplifies a received optical signal containing multiple wavelengths, a monitor circuit that monitors light intensities of the demultiplexed optical signal, a processor, and a memory having information representing a relationship between a total incident light intensity of the optical signal incident onto the optical amplifier and gains of the optical amplifier for the respective wavelengths.
    Type: Grant
    Filed: August 29, 2022
    Date of Patent: February 13, 2024
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Toshio Ishii, Naoki Kuwata
  • Patent number: 11892716
    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.
    Type: Grant
    Filed: January 4, 2022
    Date of Patent: February 6, 2024
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki Sugiyama
  • Patent number: 11874512
    Abstract: An optical module includes: a module body that is configured to be inserted into a cage, at an entrance of the cage an electromagnetic wave shielding terminal being provided, and has a groove formed on one surface thereof and configured to engage with a latch part formed on the cage; and an engagement release member including a body that is provided with a pull tab, the body being slidably attached to the module body and configured to slide in response to an external force, and an arm part that extends from the body along the groove, and slides with respect to the groove in conjunction with the sliding of the body and release the engagement in a state in which the electromagnetic wave shielding terminal is pressed. The module body has a concave part on a surface of the groove, the surface being in contact with the arm part.
    Type: Grant
    Filed: October 9, 2020
    Date of Patent: January 16, 2024
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Kazuyuki Kuramochi
  • Publication number: 20240004141
    Abstract: An optical device includes two first waveguides arranged side by side, and a single second waveguide arranged so as to be side by side with and away from the first waveguides. The first waveguide includes first tapered waveguide and second tapered waveguide. The second waveguide includes a third tapered waveguide and a third waveguide. The first tapered waveguide is constituted such that width is wider as the first tapered waveguide is closer to the second tapered waveguide. The second tapered waveguide is constituted such that width is narrower as the second tapered waveguide is farther away from the first tapered waveguide. The third tapered waveguide is constituted such that width is wider as the third tapered waveguide is closer to the third waveguide. The first waveguide has a structure constituted such that first gap between the two first waveguides is made wider than second gap between the two first waveguides.
    Type: Application
    Filed: May 26, 2023
    Publication date: January 4, 2024
    Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki SUGIYAMA
  • Publication number: 20240006846
    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.
    Type: Application
    Filed: May 23, 2023
    Publication date: January 4, 2024
    Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Toshio ISHII
  • Patent number: 11864354
    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.
    Type: Grant
    Filed: September 22, 2021
    Date of Patent: January 2, 2024
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Kazuya Sasaki, Takatoshi Yagisawa, Tsutomu Ohtsu, Masami Kamioka
  • Patent number: 11852878
    Abstract: An optical device includes a modulator and a tap coupler. The modulator includes an optical waveguide that is formed of a thin-film lithium niobate (LN) substrate and through which light passes, and an electrode that applies voltage to the optical waveguide, and modulates a phase of light that passes through the optical waveguide in accordance with an electric field in the optical waveguide, where the electric field corresponds to the voltage. The tap coupler includes at least a part formed of the thin-film LN substrate, and splits a part of the light that passes through an inside of the optical waveguide. The tap coupler includes a delayed interferometer that splits a part of the light that passes through the optical waveguide, at a split ratio corresponding to a phase difference of light that passes through an inside of the tap coupler from the optical waveguide.
    Type: Grant
    Filed: June 14, 2022
    Date of Patent: December 26, 2023
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Masaki Sugiyama
  • Patent number: 11852948
    Abstract: In an optical transmitter having an electro-optic modulator with first child MZI and a second child MZI nested to form a parent MZI, and a processor that controls the bias voltages of electro-optic modulator. In the first section of a control loop, the processor simultaneously superimposes different dither signals onto the first bias voltage of the first child MZI and the second bias voltage of the second child MZI, and extracts the first phase error information for the first child MZI and the first-round third phase error for the parent MZI from a first monitoring result. In the second section of the control loop, the processor simultaneously superimposes different dither signals onto the first and second bias voltages, and extracts the second phase error information for the second child MZI and the second-round third phase error for the parent MZI from a second monitoring result.
    Type: Grant
    Filed: May 12, 2022
    Date of Patent: December 26, 2023
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Tetsuji Yamabana
  • Patent number: 11849538
    Abstract: A terminal substrate includes a signal terminal disposed on a terminal surface of an insulation ceramic layer. An insulation resin layer of a flexible substrate includes a first surface facing the terminal surface, and a second surface on an opposite side of the first surface. A first signal pad disposed on the first surface is joined to the signal terminal. A first penetration conductive part penetrates the insulation resin layer from the first signal pad. A first signal line is disposed on the second surface. A second penetration conductive part penetrates the insulation resin layer from the first signal line. A second signal line is disposed on the first surface. A third penetration conductive part penetrates the insulation resin layer from the second signal line. A second signal pad is disposed on the second surface.
    Type: Grant
    Filed: August 24, 2021
    Date of Patent: December 19, 2023
    Assignees: NGK ELECTRONICS DEVICES, INC., NGK INSULATORS, LTD., Fujitsu Optical Components Limited
    Inventors: Noboru Kubo, Masato Ishizaki, Kento Takahashi
  • Patent number: 11837676
    Abstract: An apparatus includes a first semiconductor layer including a first bandgap; and a second semiconductor layer of a first polarity including a second bandgap smaller than the first bandgap and formed over the first semiconductor layer. The first semiconductor layer includes a first conductive region of the first polarity, a second conductive region of a second polarity, and a non-conductive region between the first conductive region and the second conductive region, and the second semiconductor layer is in contact with the first conductive region and the non-conductive region.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: December 5, 2023
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Takasi Simoyama
  • Publication number: 20230388021
    Abstract: An optical module includes a case that contains a built-in optical component related to optical communication, a built-in electronic component, and a built-in temperature sensor that detects temperature of at least one of the optical component and the electronic component. Furthermore, the optical module includes a flow channel that is formed on at least one of surfaces of the case, that extends in a longitudinal direction of the case, and through which air flows.
    Type: Application
    Filed: April 3, 2023
    Publication date: November 30, 2023
    Applicant: Fujitsu Optical Components Limited
    Inventors: Yasushi TAKAMIYA, Kazuya SASAKI, Tsuyoshi GAMO, Takatoshi YAGISAWA
  • Publication number: 20230378716
    Abstract: An optical semiconductor device includes a first optical device formed on a silicon substrate having a first surface, and a second optical device including a compound semiconductor, mounted on the first optical device, and having a second surface facing the first surface. The first optical device includes a first protrusion that protrudes toward the second surface, and a portion of the second surface makes contact with the first protrusion. In a plan view, the first protrusion is located on an inner side of an outer edge of the second optical device.
    Type: Application
    Filed: April 24, 2023
    Publication date: November 23, 2023
    Applicant: Fujitsu Optical Components Limited
    Inventor: Nobuaki HATORI
  • Publication number: 20230341641
    Abstract: An optical device includes a substrate that includes a substrate-side electrode, and a chip that includes N active layers and a chip-side electrode that is mounted on the substrate-side electrode. From among bumps that are disposed side by side with an Nth layer on both sides of a surface that is located opposite the Nth layer and that is included in the substrate-side electrode, bumps located at a position farther away from the center of gravity of all of the bumps are defined as first bumps, and bumps located at a position closer to the center of gravity are defined as second bumps. In at least one combination of the first bump and the second bump, the first bump and the second bump are arranged on the substrate-side electrode such that a distance between the first bump and the surface is longer than a distance between the second bump and the surface.
    Type: Application
    Filed: March 3, 2023
    Publication date: October 26, 2023
    Applicant: Fujitsu Optical Components Limited
    Inventor: Takeshi MATSUMOTO
  • Publication number: 20230333439
    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.
    Type: Application
    Filed: February 6, 2023
    Publication date: October 19, 2023
    Applicant: Fujitsu Optical Components Limited
    Inventor: Masaki SUGIYAMA
  • Publication number: 20230324726
    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.
    Type: Application
    Filed: December 21, 2022
    Publication date: October 12, 2023
    Applicant: Fujitsu Optical Components Limited
    Inventor: Masaki SUGIYAMA