公开(公告)号：US11711150B2

公开(公告)日：2023-07-25

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

CPC classification number: H04B10/572 ,  G02B6/287 ,  H04B10/272 ,  H04B10/506 ,  H04J14/0204

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：US12074945B2

公开(公告)日：2024-08-27

申请号：US17800739

申请日：2020-02-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomohiro Taniguchi ,  Shinya Tamaki ,  Tetsuya Suzuki ,  Yasutaka Kimura

IPC: H04L67/12

CPC classification number: H04L67/12

Abstract: An object of the present disclosure is to provide a data collection system capable of collecting various pieces of metadata other than sensing data and instrument information by existing communication protocols and associating the sensing data, the instrument information, and the metadata with each other without errors. A data collection system 301 is a data collection system that performs communication from a terminal 11 to a data collection unit 12 by one or a plurality of communication protocols, in which the terminal 11 includes a detection unit 11e other than a sensor device 11a that detects the sensing data and the instrument information, and stores metadata that is information detected by the detection unit 11e in an extended field specified by the communication protocols within a frame specified by the communication protocols for transmitting the sensing data or the instrument information, and the data collection unit 12 associates the sensing data, the instrument information, and the metadata with each other based on information for identifying the terminal 11 described in the frame.

公开(公告)号：US12058018B2

公开(公告)日：2024-08-06

申请号：US18026638

申请日：2020-09-30

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Shinya Tamaki ,  Ryota Shiina ,  Tetsuya Suzuki ,  Yasutaka Kimura ,  Tomohiro Taniguchi ,  Sei Kou ,  Tomoya Hatano

IPC: H04L43/08 ,  G16Y20/20 ,  G16Y40/10

CPC classification number: H04L43/08 ,  G16Y20/20 ,  G16Y40/10

Abstract: An object of the present disclosure is to collectively collect sensing data and metadata regarding normality of equipment by utilizing light communication protocol.
The present disclosure is a system that collects sensing data from a sensor terminal in a data collection unit using a data collection network, the sensor terminal including a detection unit configured to detect metadata regarding internal information of the sensor terminal other than a sensor device that detects sensing data and equipment information and transmitting the metadata detected by the detection unit using an extended area or an optional area defined in communication protocol for transmitting the sensing data or the equipment information in a frame defined in the communication protocol, and the data collection unit associating the sensing data, the equipment information, and the metadata on the basis of information for identifying the sensor terminal described in the frame.

公开(公告)号：US11956009B2

公开(公告)日：2024-04-09

申请号：US17911238

申请日：2020-03-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Atsuko Kawakita ,  Yasutaka Kimura ,  Kazutaka Hara

IPC: H04B10/275 ,  H04B10/032

CPC classification number: 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：US09276670B2

公开(公告)日：2016-03-01

申请号：US14241280

申请日：2012-11-15

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Youichi Fukada ,  Takashi Mitsui ,  Takeshi Sakamoto ,  Naoto Yoshimoto ,  Yasutaka Kimura

IPC: H04B10/032 ,  H04Q11/06 ,  H04Q11/00 ,  H04L12/24

CPC classification number: H04B10/032 ,  H04L41/0654 ,  H04L43/50 ,  H04Q11/0067 ,  H04Q2011/0081 ,  H04Q2011/0083

Abstract: A self-diagnostic method for PON protection system, in which optical switch-related failure can be previously inspected, and a PON protection system. A circuit is configured while an optical switch is switched so that signal light from an ONU is input to both a normal system OSU and a redundancy system OSU of an optical access network including the ONU, and there are conducted a circuit configuration test in which the signal light to the normal system OSU and the signal light to the redundancy system OSU are monitored for a predetermined period of time, and when the signal light to one of the OSUs and the signal light to the other do not correspond to each other, it is judged as abnormality and an open state test in which an optical switch is opened so that the signal light from the ONU is input to only the normal system OSU of the optical access network including the ONU, a circuit of the redundancy system OSU and the ONU is brought into an open state, the signal light to redundancy system OSU is monitored for a predetermined time of period, and when the signal light to the redundancy system exists, it is judged as abnormality.

Abstract translation: PON保护系统的自诊断方法，其中可以预先检查光交换机故障，以及PON保护系统。 在光开关切换时配置电路，使得来自ONU的信号光被输入到包括ONU的光接入网的正常系统OSU和冗余系统OSU，并且进行电路配置测试，其中 监视到正常系统OSU的信号光和到冗余系统OSU的信号光预定的时间段，并且当向OSU中的一个和信号光之间的信号光彼此不对应时， 被判断为光开关打开的异常和开状态测试，使得来自ONU的信号光仅输入到包括ONU的光接入网的正常系统OSU，冗余系统OSU的电路和 ONU进入打开状态，信号光到冗余系统OSU被监视预定时间段，并且当到冗余系统的信号光存在时，判断为异常。

公开(公告)号：US12136323B2

公开(公告)日：2024-11-05

申请号：US17927500

申请日：2020-05-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryota Shiina ,  Tomohiro Taniguchi ,  Shinya Tamaki ,  Kazutaka Hara ,  Koji Tsuji ,  Tetsuya Suzuki ,  Yasutaka Kimura

IPC: G08B13/196 ,  G06V20/52

Abstract: The present disclosure provides a monitoring system including an edge processing apparatus including a space distinct ID management database, a space distinct ID control unit, a storage unit, an analysis unit, and an abnormality determination unit, and a controller, a transmitter, and a camera with sensor that are installed in a location to be monitored, in which the space distinct ID management database stores a space distinct ID and a transmission time of the space distinct ID in association with the location to be monitored, the space distinct ID control unit acquires the space distinct ID associated with the location to be monitored from the space distinct ID management database and transmits the space distinct ID that is acquired to the controller in the associated location to be monitored, the controller transmits the space distinct ID acquired from the space distinct ID control unit to the transmitter, the transmitter generates a signal based on the space distinct ID acquired from the controller and diffuses, in a space of the location to be monitored, the signal that is generated, the camera with sensor includes a sensor that captures an image of the location to be monitored where the camera with sensor is installed and receives the signal diffused by the transmitter, and the camera with sensor transmits a received signal received by the sensor to the storage unit, the storage unit stores the received signal received from the camera with sensor in association with the location to be monitored where the camera with sensor is installed, the analysis unit extracts a space distinct ID from the received signal stored in the storage unit and transmits the space distinct ID that is extracted to the abnormality determination unit in association with the location to be monitored, and the abnormality determination unit compares and determines whether there is a match between the space distinct ID associated with the location to be monitored from the analysis unit and current time, and the space distinct ID and the transmission time of the space distinct ID associated with the location to be monitored that are stored in the space distinct ID management database.

公开(公告)号：US12068776B2

公开(公告)日：2024-08-20

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.

公开(公告)号：US11881893B2

公开(公告)日：2024-01-23

申请号：US17798295

申请日：2020-02-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazutaka Hara ,  Yasutaka Kimura ,  Atsuko Kawakita

IPC: H04J14/00 ,  H04B10/2507 ,  H04B10/25 ,  H04J14/02

CPC classification number: H04B10/25073 ,  H04B10/25891 ,  H04J14/0204 ,  H04J14/0252

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：US11290189B2

公开(公告)日：2022-03-29

申请号：US17271222

申请日：2019-08-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Atsuko Kawakita ,  Kazutaka Hara ,  Hiroyuki Furukawa ,  Yasutaka Kimura ,  Kenji Horikawa

IPC: H04J14/00 ,  H04B10/272 ,  G02B6/27 ,  H04L12/44

Abstract: To provide an optical communication system and an optical communication method able to achieve a high reliable access network capable of long haul distance transmission considering the optical energy efficiency even if the user distribution is biased. An uneven branch optical splitter included in an optical communication system according to the present invention can output the optical intensities different for each output port by adjusting the branching configuration and the branching ratio. For example, a reach transmission distance of the farmost user can be extended or the number of connectible users can be increased by adjusting the branching configuration of the uneven branch optical splitter or the branching ratios such that the near minimum reception sensitivity is given for the ONU installed near the telecommunications carrier.

公开(公告)号：US11996895B2

公开(公告)日：2024-05-28

申请号：US17798068

申请日：2020-02-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazutaka Hara ,  Yasutaka Kimura ,  Atsuko Kawakita

IPC: H04B10/61 ,  H04B10/25

CPC classification number: H04B10/614 ,  H04B10/25891

Abstract: In order to solve the problems described above, an object of the present invention is to provide an optical communication system and a control method that automatically adjust a branching ratio of an optical splitter in accordance with a connection of a new ONU. An optical communication system according to the present invention causes an operation system or a DBA (Dynamic Bandwidth Allocation) function and a determining unit of a branching ratio of an optical splitter to cooperate with each other, adjusts the branching ratio so as to enable ranging with an active ONU, and takes into consideration an initial connection sequence through which an ONU is newly connected.