公开(公告)号：US20230055033A1

公开(公告)日：2023-02-23

申请号：US17911238

申请日：2020-03-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Atsuko KAWAKITA ,  Yasutaka KIMURA ,  Kazutaka HARA

IPC: H04B10/032 ,  H04B10/275

Abstract: An object of the present invention is to provide an optical communication system and an optical communication method capable of achieving a long transmission distance with a passive element and obtaining redundancy of a ring topology.
The optical communication system according to the present invention is a PON system having a ring configuration, in which an unequal branch optical splitter having a left-right symmetrical configuration is disposed in a trunk fiber wired in a loop shape. An OLT and an ONU have a configuration in which two sets of Tx (transmitter) and Rx (receiver) are mounted. Two sets of Tx (transmitters) and Rx (receivers) in each of a plurality of ONUs are respectively connected to left and right symmetrical ports of one unequally branched light beam SP.

公开(公告)号：US20230310674A1

公开(公告)日：2023-10-05

申请号：US18015685

申请日：2020-11-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomohiro TANIGUCHI ,  Ayako IWAKI ,  Kazuhide NAKAJIMA ,  Nobutomo HANZAWA ,  Takashi MATSUI ,  Yuto SAGAE ,  Chisato FUKAI ,  Kazutaka HARA ,  Atsuko KAWAKITA

IPC: A61L2/10 ,  A61L2/24 ,  G02F1/37

CPC classification number: A61L2/10 ,  A61L2/24 ,  G02F1/37 ,  A61L2202/11

Abstract: An object of the present invention is to provide a light irradiation system capable of securing economic efficiency, flexibility, reliability, and safety, and further capable of reducing a transmission loss between a center side and a remote side.
The present light irradiation system can secure economic efficiency by sharing a single light source installed on the center side with a plurality of irradiation places. The present light irradiation system can irradiate a place to be sterilized with ultraviolet light output by moving the optical fiber tip end on the remote side in a pinpoint manner, and can also secure flexibility. In addition, the present light irradiation system can secure reliability and safety by performing output control of the light source on the center side. Furthermore, in the present light irradiation system, light in a low-loss wavelength region is transmitted from the center side through the optical fiber, wavelength conversion is performed on the remote side, and thus the transmission loss between the center side and the remote side can be reduced.

公开(公告)号：US20230163852A1

公开(公告)日：2023-05-25

申请号：US17908527

申请日：2020-03-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Masamichi FUJIWARA ,  Kazutaka HARA ,  Takuya KANAI ,  Yasutaka KIMURA ,  Atsuko KAWAKITA

IPC: H04B10/2575 ,  H04B10/278 ,  H04J14/02

CPC classification number: H04B10/25756 ,  H04B10/278 ,  H04J14/0202

Abstract: An optical communication system configured with a station-side apparatus and a plurality of subscriber-side apparatuses in a bus network topology includes an optical amplification unit installed on a station side, and a drop unit configured to branch an optical signal and excitation light, wherein the optical amplification unit includes an amplifier configured to amplify a downlink signal, and an excitation light output unit configured to output the excitation light for amplifying an uplink signal to a communication path, and the drop unit changes a branching ratio in accordance with a wavelength of the optical signal so that a transmission loss of the excitation light with respect to a trunk fiber is reduced.

公开(公告)号：US20220173813A1

公开(公告)日：2022-06-02

申请号：US17437925

申请日：2020-03-06

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Atsuko KAWAKITA ,  Kazutaka HARA ,  Yasutaka KIMURA ,  Kenji HORIKAWA ,  Hiroyuki FURUKAWA

IPC: H04B10/572 ,  G02B6/287 ,  H04B10/272 ,  H04B10/50 ,  H04J14/02

Abstract: An object is to provide an optical communication system and an optical communication method that are capable of, when assigning wavelengths on a per-service basis and providing services on a per-area basis, preventing degradation of signal quality due to linear crosstalk and preventing an increase in cost and size. An optical communication system according to the present invention includes an optical splitter 300 connecting N first ports and M second ports by a combination of 2×2 fiber optical splitters, N and M each being an integer of two or more, where wavelengths of optical signals to be received are limited for each group of optical receivers 106, by using a correlation between a fused extension length of at least one 2×2 fiber optical splitter directly connected to the first port, among the 2×2 fiber optical splitters, and wavelength output characteristics of the second port of the optical splitter 300.

公开(公告)号：US20240250757A1

公开(公告)日：2024-07-25

申请号：US18290383

申请日：2021-05-19

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Chisato Fukai ,  Tomohiro TANIGUCHI ,  Kazuhide Nakajima ,  Ayako IWAKI ,  Takashi Matsui ,  Nobutomo HANZAWA ,  Yuto SAGAE ,  Kazutaka HARA ,  Atsuko KAWAKITA

IPC: H04B10/80 ,  G02B6/02 ,  G02B6/04 ,  G02B6/10

CPC classification number: H04B10/801 ,  G02B6/02042 ,  G02B6/04 ,  G02B6/102

Abstract: An object of the present invention is to provide an ultraviolet optical transmission system in which cutting of an optical fiber or a complicated procedure is not necessary when an optical fiber is exchanged.
The present invention provides a system in which light with an ultraviolet band is transmitted along an optical transmission path formed of a quartz-based optical fiber, and in which an optical transmission unit is switched by a rotation mechanism in which an optical transmission path of one of an optical coupling unit rotates about an axis, the optical coupling unit including an optical transmission path including a plurality of optical transmission units on the same circumference from a center on an end surface of the optical coupling unit; an optical transmission path in which the optical transmission units are arranged on the same circumference as a circumference on which the plurality of optical transmission units are arranged; two ferrules each containing the two optical transmission paths; and a cylindrical sleeve in which the two ferrules are inserted in a hollow.

公开(公告)号：US20230270898A1

公开(公告)日：2023-08-31

申请号：US18018038

申请日：2020-10-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takashi MATSUI ,  Kazuhide NAKAJIMA ,  Nobutomo HANZAWA ,  Yuto SAGAE ,  Chisato FUKAI ,  Ayako IWAKI ,  Tomohiro TANIGUCHI ,  Kazutaka HARA ,  Atsuko KAWAKITA

IPC: A61L2/10 ,  A61L9/20

CPC classification number: A61L2/10 ,  A61L9/20 ,  A61L2202/11 ,  A61L2202/15

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and a decontamination method that can perform decontamination economically without any input from a user.
The ultraviolet light irradiation system forms a linear or planar ultraviolet light irradiation space by spatially bundling a plurality of ultraviolet light beams with high energy density or moving the ultraviolet light with high energy density at high speed. The ultraviolet light irradiation system can decontaminate a human body and clothing simply by passing through the space. Further, since the ultraviolet light irradiation system performs decontamination in the space, bacteria and viruses emitted from a carrier are not passed through the space.

公开(公告)号：US20230161039A1

公开(公告)日：2023-05-25

申请号：US17922778

申请日：2020-07-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Atsuko KAWAKITA ,  Tomohiro TANIGUCHI ,  Kazutaka HARA

IPC: G01S17/42 ,  G01S7/481

CPC classification number: G01S17/42 ,  G01S7/4818

Abstract: It is an object of the present invention to provide a position measuring system, a position measuring device, and a method for measuring a position that can accurately measure the position of an object to be measured without being limited by an environment or an optical axis.
A position measuring device 20 according to the present invention is characterized by including a light receiving unit 21 configured to receive scattered light Lsc emitted from a side surface of an optical fiber 50, a database 22 configured to store a correspondence between information on the scattered light and a position of the object to be measured, and a determination unit 23 configured to determine, based on the correspondence stored in the database, a position of the object to be measured from information on the scattered light received by the light receiving unit.

公开(公告)号：US20230074152A1

公开(公告)日：2023-03-09

申请号：US17798295

申请日：2020-02-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazutaka HARA ,  Yasutaka KIMURA ,  Atsuko KAWAKITA

IPC: H04B10/2507 ,  H04J14/02 ,  H04B10/25

Abstract: An optical communication system according to the present invention cancels waveform distortion due to wavelength dispersion by extracting the spectrum of a transmitted optical signal and passing the optical signal to a fiber having a dispersion value opposite to a dispersion amount corresponding to a transmission distance received by the spectrum component and compensates for a transmission path loss due to the fiber having the opposite dispersion value using optical splitters having different split ratios. With this configuration, the present invention can compensate for waveform distortion due to wavelength dispersion by a simple method in an access network and achieve an increase in the reachable transmission distance of the farthest user or an increase in the number of connectable users.

公开(公告)号：US20230293741A1

公开(公告)日：2023-09-21

申请号：US18018035

申请日：2020-10-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takashi MATSUI ,  Kazuhide NAKAJIMA ,  Nobutomo HANZAWA ,  Yuto SAGAE ,  Chisato FUKAI ,  Ayako IWAKI ,  Tomohiro TANIGUCHI ,  Kazutaka HARA ,  Atsuko KAWAKITA

IPC: A61L2/10 ,  G02B6/10 ,  A61L2/26 ,  A61L2/24

CPC classification number: A61L2/10 ,  A61L2/24 ,  A61L2/26 ,  G02B6/102 ,  A61L2202/11 ,  A61L2202/14

Abstract: An object of the present invention is to provide an ultraviolet light irradiation system and a decontamination method that are economical and easy to operate, and that can perform decontamination without any input from a user. In the present invention, an optical fiber or an optical waveguide that radiates ultraviolet light in a lateral direction, the optical fiber or the optical waveguide is built in a sheet shape, and irradiates a surface with the ultraviolet light. Specifically, a material in which a material having a high scattering coefficient is added to the optical fiber is used, a grating is formed in the optical fiber, the optical fiber is given a minute bending with a minute ruggedness, and an arbitrary bending is given on the optical fiber, or the like, thereby achieving side radiation. By such a feature, it has the effect that ultraviolet light decontamination can be performed at all times or at necessary timing for an object touched by an unspecified number of people.

公开(公告)号：US20230147193A1

公开(公告)日：2023-05-11

申请号：US17910557

申请日：2020-03-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yasutaka KIMURA ,  Kazutaka HARA ,  Atsuko KAWAKITA

IPC: H04B10/073

CPC classification number: H04B10/073

Abstract: In response to the above issue, an object of the present invention is to provide a diagnostic apparatus and a diagnostic method capable of accurately recognizing whether to use a long extension function at the time of relocation of an accommodation station of an OLT. The diagnostic apparatus according to an aspect of the present invention has an allowable line length list that is a relationship between a center wavelength and an allowable line distance that satisfies a selected spectrum width in an optical fiber used in an optical communication system, measures a center wavelength and a spectrum width of a spectrum for each ONU, matches the allowable line length list, and obtains an allowable line distance of each ONU.