公开(公告)号：US20230055033A1

公开(公告)日：2023-02-23

申请号：US17911238

申请日：2020-03-17

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Atsuko KAWAKITA ,  Yasutaka KIMURA ,  Kazutaka HARA

IPC分类号： H04B10/032 ,  H04B10/275

摘要： 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：US20220264438A1

公开(公告)日：2022-08-18

申请号：US17625435

申请日：2019-07-10

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Tomoki MURAKAMI ,  Toshiro NAKAHIRA ,  Ryota SHIINA ,  Kazutaka HARA ,  Tomohiro TANIGUCHI

IPC分类号： H04W48/18 ,  H04W48/16

摘要： A control station device includes a policy generation unit that calculates a priority order of a plurality of wireless communication systems having different types of systems on a basis of information acquired from a wireless terminal device that selects one wireless communication system from among the plurality of wireless communication systems to perform wireless communication, and generates a selection policy indicating the priority order of the plurality of wireless communication systems, and a policy delivery unit that delivers the selection policy indicating the priority order of the plurality of wireless communication systems to the wireless terminal device. With this configuration, an optimal wireless communication system that maximizes the performance of each wireless terminal device can be selected while reducing the load and calculation time imposed on the control station device.

公开(公告)号：US20240187099A1

公开(公告)日：2024-06-06

申请号：US18285926

申请日：2021-04-14

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Shin KANEKO ,  Junichi KANI ,  Kazutaka HARA ,  Takuya KANAI

IPC分类号： H04B10/27 ,  H04B10/58

CPC分类号： H04B10/27 ,  H04B10/58

摘要： An optical switch receives an input of an optical signal which has been transmitted by a first optical communication device from a first port, and outputs the optical signal from a second port connected to a first optical transmission line included in an optical route in which an optical path between the first optical communication device and a second optical communication device is set. An optical branching unit branches a part of the optical signal which has been transmitted through the first optical transmission line, and outputs the branched optical signal to a second optical transmission line. An optical transmitting and receiving apparatus includes a reception unit, a transmission unit, and a light cutoff unit. The reception unit receives an input of the optical signal which has been branched by the optical branching unit from the second optical transmission line, and acquires a signal addressed to a destination different from the second optical communication device from the input optical signal. The transmission unit generates an optical signal using light emitted by a light source. The light cutoff unit prevents the light from the light source from being input to the second optical transmission line.

公开(公告)号：US20230310674A1

公开(公告)日：2023-10-05

申请号：US18015685

申请日：2020-11-02

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC分类号： A61L2/10 ,  A61L2/24 ,  G02F1/37

CPC分类号： A61L2/10 ,  A61L2/24 ,  G02F1/37 ,  A61L2202/11

摘要： 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：US20230130486A1

公开(公告)日：2023-04-27

申请号：US17915850

申请日：2020-04-02

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Ryota SHIINA ,  Tomohiro TANIGUCHI ,  Kazutaka HARA ,  Shinya TAMAKI ,  Tomoki MURAKAMI ,  Toshiro NAKAHIRA

IPC分类号： H04B10/112 ,  H04B10/2575 ,  H04W4/90 ,  H04W4/38

摘要： An object of the present disclosure is to inform a user of a safe evacuation guidance route in real time using smart lightings without deploying dedicated evacuation guidance facilities.
The present disclosure is a wireless communication system including: one or more wireless base stations that wirelessly communicate with a terminal; a plurality of optical base stations that transmit an optical signal to the terminal; and a base station control device that controls the optical signal transmitted by the optical base stations, wherein the base station control device collects environment information around the optical base stations, detects a disaster around the optical base stations using the collected environment information, and when detecting a disaster, causes the optical base station installed at a position close to a disaster occurrence location and the optical base station installed at a position far from the disaster occurrence location to output light of different colors.

公开(公告)号：US20220361070A1

公开(公告)日：2022-11-10

申请号：US17619663

申请日：2019-06-20

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Ryota SHIINA ,  Kazutaka HARA ,  Tomohiro TANIGUCHI ,  Tomoki MURAKAMI ,  Toshiro NAKAHIRA

IPC分类号： H04W36/08 ,  H04B10/079 ,  H04B10/112

摘要： The present disclosure aims to enable communication to be performed with stable quality even when a user uses a terminal while moving. In the wireless communication system according to the present disclose, a switching control unit 15 sets switching illuminance pth for maintaining illuminance of an optical signal received by a terminal 91 at requested illuminance corresponding to throughput or higher during the time until connection switching between the communication with an optical wireless access point 92 and the communication with an RF wireless access point 93 is completed, and when the received illuminance p becomes lower than the switching illuminance pth during connection with the optical wireless access point 92, the switching control unit 15 performs connection switching from the optical wireless communication to the RF wireless communication.

公开(公告)号：US20220352993A1

公开(公告)日：2022-11-03

申请号：US17624126

申请日：2019-07-02

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Tomohiro TANIGUCHI ,  Ryota SHIINA ,  Kazutaka HARA ,  Tomoki MURAKAMI ,  Toshiro NAKAHIRA

IPC分类号： H04B10/85 ,  H04B10/112 ,  H04W12/06

摘要： An object is to provide a communication system, a base station, and a communication method that can avoid a state in which an RF wireless communication cannot be started due to the quality of optical wireless communication.
In an optical communication system according to the present invention, a base station device repeatedly transmits an authentication information frame addressed to a terminal device at a predetermined cycle by the optical wireless communication, the frame including authentication information for connection to the terminal device by the RF wireless communication. Even if the terminal fails to acquire the authentication information at a certain timing due to the quality of optical wireless communication, the communication system has a mechanism that acquires the same authentication information at regular time intervals, so that terminal authentication processing can be performed at the time when the terminal acquires the authentication information.

公开(公告)号：US20210266071A1

公开(公告)日：2021-08-26

申请号：US17262976

申请日：2019-07-23

申请人： Nippon Telegraph and Telephone Corporation

发明人： Ryota SHIINA ,  Kazutaka HARA ,  Satoshi IKEDA

IPC分类号： H04B10/2575 ,  H04B17/309 ,  H04W24/02 ,  H04B10/079

摘要： An object of the present invention is to provide an optical/RF wireless hybrid communication system and a control method capable of solving the instability of link states of an RF wireless link and an optical wireless link. According to an optical/RF wireless hybrid communication system and a control method of the present invention, when data is transmitted, the link is not limited to one of an RF wireless link and an optical wireless link, a link state is determined based on signal quality received in channels of both the RF wireless link and the optical wireless link, and a distribution of data to be transmitted in each link is determined based on a result thereof. For this reason, the link can be switched according to circumstances of the transmission state due to an external disturbance and the like.

公开(公告)号：US20240250757A1

公开(公告)日：2024-07-25

申请号：US18290383

申请日：2021-05-19

申请人： Nippon Telegraph and Telephone Corporation

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

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

CPC分类号： H04B10/801 ,  G02B6/02042 ,  G02B6/04 ,  G02B6/102

摘要： 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：US20240201316A1

公开(公告)日：2024-06-20

申请号：US18288011

申请日：2021-05-20

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takeshi IMAI ,  Naotaka SHIBATA ,  Kazutaka HARA ,  Ryo IGARASHI

IPC分类号： G01S5/16

CPC分类号： G01S5/16

摘要： A mobile terminal according to the present invention is configured to: acquire position information from a lighting device which transmits the position information by a change in a light output mode; derive a first distance between a first coordinate and a terminal projection position, the first coordinate indicating a position obtained by projecting, on a projection plane parallel to a floor surface, a first lighting device from which first position information is acquired as the position information, and the terminal projection position being obtained by projecting the mobile terminal on the projection plane; derive a second distance between a second coordinate and the terminal projection position, the second coordinate indicating a position obtained by projecting, on the projection plane, a second lighting device from which second position information is acquired as the position information; acquire a rotation angle of rotation of the mobile terminal on the projection plane from acquisition of the first position information to acquisition of the second position information; and estimate a coordinate indicating the terminal projection position based on the first coordinate, the first distance, the second coordinate, the second distance, and the rotation angle.