Patents Assigned to Fujikura Ltd.
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Publication number: 20240329348Abstract: An optical cable includes optical fiber units each including a bundle of optical fibers. The optical fiber units are twisted together in an S-Z configuration in which a twisting direction of the optical fiber units is reversed at a reversal part and an adjacent reversal part adjacent to the reversal part. A twisting angle, by which the optical fiber units are twisted in a circumferential direction between the reversal part and the adjacent reversal part, is 540 degrees or greater.Type: ApplicationFiled: April 19, 2022Publication date: October 3, 2024Applicant: Fujikura Ltd.Inventors: Shogo Shimizu, Soichiro Kaneko, Akira Namazue, Ken Osato
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Patent number: 12107379Abstract: A laser device includes at least one light source; a delivery fiber that is configured to propagate of laser light emitted from the light source; and a first light detection unit and a second light detection unit configured to detect a part of light propagating in a direction opposite to a propagation direction of the laser light through the delivery fiber. The first light detection unit detects first light included in a wavelength band of visible light. The second light detection unit detects second light included in a wavelength band of near-infrared light.Type: GrantFiled: February 27, 2020Date of Patent: October 1, 2024Assignee: Fujikura Ltd.Inventors: Shinichi Sakamoto, Yasuto Chiba, Wataru Kiyoyama, Yutaka Yamaguchi, Takashi Hasunuma
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Patent number: 12107310Abstract: A mode converter which converts between a mode of a post-wall waveguide and a mode of a line in which a strip-shaped conductor is formed on another substrate different from a substrate of the post-wall waveguide, is less likely to cause a transmission failure resulting from a change in environmental temperature. A mode converter (10) includes: a post-wall waveguide (PW) in which an opening (121) is provided in a wide wall (conductor layer 12); a dielectric substrate (15) having a main surface on which a strip-shaped conductor (16) is formed; and a joining member (solder 18) joining the wide wall (conductor layer 12) and the substrate (15), wherein in a plan view, the opening (121) and the strip-shaped conductor (16) overlap each other.Type: GrantFiled: June 5, 2020Date of Patent: October 1, 2024Assignee: FUJIKURA LTD.Inventor: Yusuke Uemichi
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Publication number: 20240319463Abstract: An optical fiber ribbon includes five or more optical fibers disposed in a disposition direction perpendicular to a longitudinal direction of the optical fiber ribbon and connection parts disposed intermittently in the longitudinal and disposition directions. Each of the connection parts is disposed between and connects adjacent ones of the optical fibers. The optical fiber ribbon has a first high-density region and a first low-density region disposed at different positions in the longitudinal direction and a second high-density region and a second low-density region disposed at different positions in the longitudinal direction. At least two of the connection parts having different positions from each other in the longitudinal and disposition directions are disposed in the first high-density region. At least another two of the connection parts having different positions from each other in the longitudinal and disposition directions are disposed in the second high-density region.Type: ApplicationFiled: April 25, 2022Publication date: September 26, 2024Applicant: Fujikura Ltd.Inventors: Noriaki Yamashita, Itaru Ishida, Ken Osato
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Patent number: 12098968Abstract: A device that pulls out an optical fiber includes: a bobbin support that supports a bobbin rotatably about a rotation axis; a first pulling out unit that holds a first end of the optical fiber, pulls out a first portion of the optical fiber wound around the bobbin from a side of the first end in a state where the bobbin rotates in a predetermined direction, and returns a part of the first portion to the bobbin in a state where the bobbin rotates in a direction opposite to the predetermined direction; and a second pulling out unit that holds a second end of the optical fiber after the first pulling out unit pulls out the first portion from the side of the first end, and pulls out a second portion of the optical fiber wound around the bobbin from a side of the second end.Type: GrantFiled: September 29, 2020Date of Patent: September 24, 2024Assignee: Fujikura Ltd.Inventors: Shengyang Luo, Satoshi Matsunaga
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Publication number: 20240310690Abstract: A light diffraction element includes microcells disposed along a plane and each of which includes subcells. Each of the subcells has a refractive index with respect to at least one of in-plane directions of the plane. The refractive index is one of n predetermined refractive indexes, where n is an integer of not less than 2.Type: ApplicationFiled: January 27, 2022Publication date: September 19, 2024Applicant: Fujikura Ltd.Inventor: Yuichiro Kunai
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Patent number: 12092859Abstract: A multicore fiber includes: a cladding; and three or more and five or less cores disposed at rotationally asymmetric positions on a circumference centered at a center of the cladding. No core is disposed at the center of the cladding. Angles formed by adjacent ones of lines connecting the center of the cladding and respective ones of the cores are all larger than 60°.Type: GrantFiled: December 16, 2020Date of Patent: September 17, 2024Assignee: Fujikura Ltd.Inventors: Katsuhiro Takenaga, Yusuke Sasaki, Masaki Ohzeki
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Patent number: 12092675Abstract: An evaluation device includes a radio communication module that contains a temperature regulator that adjusts a temperature of a radio communication module to be evaluated, a housing case that houses the radio communication module and the temperature regulator, a gas supplier that supplies dry gas inside the housing case, and a measurement antenna that is disposed so as to face the radio communication module, and that transmits and receives radio waves for measurement. The housing case includes a case main body and a shutter plate that closes an opening of the case main body. The shutter plate is formed of a dielectric foam material, and the shutter plate is capable of contacting and separating from an open edge of the case main body. At least a part of the shutter plate separates from the open edge of the case main body to release gas from inside the housing case when an inner pressure of the housing case is greater than or equal to a predetermined value.Type: GrantFiled: December 27, 2022Date of Patent: September 17, 2024Assignee: FUJIKURA LTD.Inventors: Yuki Suto, Eiji Takenaka, Katsumasa Takahashi, Go Katsura
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Patent number: 12092879Abstract: A multicore fiber includes: a cladding; a center core at a center of the cladding; and seven or more outer cores disposed at rotationally asymmetric positions on a circumference centered at the center of the cladding. Angles formed by adjacent ones of lines connecting the center core and respective ones of the outer cores are all 60° or less.Type: GrantFiled: December 16, 2020Date of Patent: September 17, 2024Assignee: Fujikura Ltd.Inventors: Katsuhiro Takenaga, Yusuke Sasaki, Masaki Ohzeki
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Patent number: 12095220Abstract: An optical module unit includes: optical modules each including light emitting elements; and a mount on which the light emitting elements are disposed on one side of the mount, and includes a sub-passage; and a manifold to which the optical modules are fixed. The manifold includes a first main passage to which a first end of each of the sub-passages is connected in parallel.Type: GrantFiled: June 12, 2019Date of Patent: September 17, 2024Assignee: Fujikura Ltd.Inventor: Yukihiko Takahashi
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Patent number: 12095435Abstract: A high frequency variable attenuation circuit includes an input terminal, an output terminal, a first resistor, a second resistor, a third resistor, and a first switching circuit. The first switching circuit has an output side resistor and an output side switching element that are connected in series to each other. The first switching circuit has a first circuit end connected to the second end of the second resistor and the output terminal, and a second circuit end connected to the ground.Type: GrantFiled: January 25, 2023Date of Patent: September 17, 2024Assignee: FUJIKURA LTD.Inventor: Masayuki Yoshiyama
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Publication number: 20240302618Abstract: A storage unit includes a wound body made of wound linear material and a storage body that stores the wound body. The wound body includes a first spiral part in which the wound linear material is spirally wound in a first winding direction such that a distance between the wound linear material of the first spiral part and a center of the wound body gradually decreases, a first inversion part, disposed inside the first spiral part, that inverts a winding direction of the wound linear material from the first winding direction to a second winding direction opposite to the first winding direction, and a second spiral part, disposed outside the first inversion part, in which the wound linear material is spirally wound in the second winding direction such that a distance between the wound linear material of the second spiral part and the center gradually increases.Type: ApplicationFiled: February 21, 2022Publication date: September 12, 2024Applicant: FUJIKURA LTD.Inventors: Go Taki, Shengyang Luo, Masayuki Ishioka, Minoru Takahashi
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Publication number: 20240304968Abstract: A digital phase shifter of the present invention is a digital phase shifter in which digital phase shift circuits are cascade-connected, each of the digital phase shift circuits including a signal line, a pair of inner lines provided on both sides of the signal line, a pair of outer lines provided on outer sides of the inner lines, a first ground conductor connected to one ends of the inner lines and one ends of the outer lines, a second ground conductor connected to the other ends of the outer lines, and a pair of electronic switches provided between the other ends of the inner lines and the second ground conductors.Type: ApplicationFiled: August 8, 2022Publication date: September 12, 2024Applicant: Fujikura Ltd.Inventor: Yusuke Uemichi
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Patent number: 12087991Abstract: An aspect of the present invention reduces loss that may occur in cases where electromagnetic waves are guided from one main surface side of a substrate to the other main surface side of the substrate. A waveguide device (10, 10A, 20) includes: a substrate (11); a first conductor layer (12A) and a second conductor layer (12B) which are provided on both main surfaces of the substrate, respectively; a main conductor post (MP) which penetrates between the both main surfaces; and one or more sub-conductor posts (SP) which penetrate between the both main surfaces and which, together with the main conductor post, guide a TEM mode or a quasi-TEM mode.Type: GrantFiled: April 7, 2020Date of Patent: September 10, 2024Assignee: FUJIKURA LTD.Inventor: Yusuke Uemichi
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Publication number: 20240288649Abstract: An optical termination box includes a housing, a module case slidably attached in a front-rear direction with respect to the housing, a front adapter fixed to a front end of the module case, an adapter holder disposed on a rear end side of the module case, a rear adapter fixed to the adapter holder, and an optical fiber that connects the front adapter to the rear adapter. The adapter holder is fixed to a rear end portion of the housing such that the rear adapter is exposed rearward of the housing.Type: ApplicationFiled: November 12, 2021Publication date: August 29, 2024Applicant: Fujikura Ltd.Inventors: Hiroyuki Takamizawa, Toshiaki Nakajima, Tomoyuki Shinoda
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Publication number: 20240288646Abstract: An optical fiber cable includes a core including optical fibers and a wrapping member that wraps the optical fibers, a sheath housing the core, and a rip cord disposed between the core and the sheath. A recessed portion is recessed inward in a radial direction of the core in the wrapping member. At least a portion of the rip cord is disposed inside the recessed portion.Type: ApplicationFiled: March 8, 2022Publication date: August 29, 2024Applicant: Fujikura Ltd.Inventors: Daisuke Hikima, Shinnosuke Sato, Daiki Takeda, Ken Osato
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Publication number: 20240275010Abstract: A digital phase shift circuit includes a signal line extending in a predetermined direction, two inner lines arranged to be separated from the signal line by a predetermined distance at both one side and the other side of the signal line, two outer lines provided at positions farther from the signal line than the inner lines at both the one side and the other side of the signal line, a first ground conductor electrically connected to one ends of the inner lines and the outer lines in the predetermined direction, and a second ground conductor electrically connected to the other ends of the outer lines in the predetermined direction. On both or one of the first ground conductor and the second ground conductor, a region between the outer line and the inner line is formed in a multilayer structure.Type: ApplicationFiled: August 8, 2022Publication date: August 15, 2024Applicant: Fujikura Ltd.Inventor: Yusuke Uemichi
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Publication number: 20240271841Abstract: A cold plate includes a main body in contact with a heat source. The main body has: an inflow hole through which a refrigerant flows in; an outflow hole through which the refrigerant flows out; and an internal space communicating with the inflow hole and the outflow hole and through which the refrigerant flows, and includes: a first heat exchange layer in the internal space; and a second heat exchange layer in the internal space. The first heat exchange layer and the second heat exchange layer are laminated in a thickness direction of the first heat exchange layer and of the second heat exchange layer.Type: ApplicationFiled: February 13, 2024Publication date: August 15, 2024Applicant: Fujikura Ltd.Inventors: Masahiro Matsuda, Yoji Kawahara
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Publication number: 20240272378Abstract: A ferrule includes: a ferrule main body having: a connection end surface, and fiber holes disposed in a first direction and through which optical fibers are inserted; and a protruding portion protruding from the ferrule main body in the first direction. The connection end surface faces forward in a longitudinal direction of the fiber holes. The protruding portion has a protruding-portion rear surface facing rearward in the longitudinal direction of the fiber holes. A distance in the longitudinal direction between the protruding-portion rear surface and the connection end surface is shorter than a distance in the longitudinal direction between the protruding-portion rear surface and a rear end of the ferrule main body.Type: ApplicationFiled: February 21, 2022Publication date: August 15, 2024Applicant: Fujikura Ltd.Inventor: Masayuki Hirose
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Patent number: 12060481Abstract: A flame retardant resin composition includes a polyolefin resin, a phosphate compound, and an organic phosphorus compound. The phosphate compound includes a salt of a phosphoric acid represented by the following formula: where m represents an integer of 1 to 100, and an amine compound containing an amino group in a molecule, and the organic phosphoric compound (C) is represented by the following formula: where X1 and X2 are the same or different, and are represented by the following formula: ALAr)n??(3), where AL is a branched or linear aliphatic hydrocarbon group having 1 to 5 carbon atoms, Ar is a phenyl group, a naphthyl group or an anthryl group which may include a substituted group, and bonds with an optional carbon atom in the AL, and n indicates an integer of 1 to 3.Type: GrantFiled: October 16, 2018Date of Patent: August 13, 2024Assignee: Fujikura Ltd.Inventors: Masayuki Iwata, Seiichi Taira, Tomonori Kondo, Shoichiro Nakamura