公开(公告)号：US20250016480A1

公开(公告)日：2025-01-09

申请号：US18709995

申请日：2021-11-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Shin KANEKO ,  Takuya KANAI ,  Tomoaki YOSHIDA

IPC: H04Q11/00

Abstract: An aspect of the present invention is an optical transmission device including a connector that is able to be connected to an accommodation module accommodating an optical fiber such that optical communication is performed, an optical switch that receives an optical signal from the connector and outputs an optical signal to the connector, an optical switch controller that controls the optical switch, an up wavelength multiplexer/demultiplexer that multiplexes light of a plurality of wavelengths output from the optical switch and outputs the multiplexed light to a transmission line, and a down wavelength multiplexer/demultiplexer that demultiplexes light input from the transmission line and outputs the demultiplexed light to the optical switch, wherein the connector can be connected to any one of a one-core accommodation module and a two-core accommodation module as the accommodation module.

公开(公告)号：US20240275496A1

公开(公告)日：2024-08-15

申请号：US18569573

申请日：2021-07-05

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hiroaki KATSURAI ,  Tomoaki YOSHIDA

IPC: H04B10/80

CPC classification number: H04B10/807

Abstract: An optical power feeding device including a photodiode array having a same number of photodiodes as a number of cores included in a multicore fiber, in which each of light receiving surfaces of the respective photodiodes faces a corresponding one of the cores of the multicore fiber, and at least the two photodiodes are connected in series to a power feeding target.

公开(公告)号：US20230353249A1

公开(公告)日：2023-11-02

申请号：US18019280

申请日：2020-09-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiaki SHITABA ,  Tomoaki YOSHIDA ,  Akihiro TANABE ,  Takashi MITSUI

IPC: H04B10/516 ,  H04B10/50

CPC classification number: H04B10/516 ,  H04B10/503

Abstract: An optical transmission device includes a distribution unit which generates a first modulated signal and a second modulated signal by distribution processing for an input signal; a first phase modulator which generates a first optical signal phase-modulated in accordance with the first modulated signal by using a laser beam based on a first oscillation frequency; a phase adjustment unit which generates the second modulated signal of a phase opposite to a phase of the first modulated signal; a second phase modulator which generates a second optical signal phase-modulated in accordance with the second modulated signal of the opposite phase by using a laser beam based on a second oscillation frequency; a multiplexing unit which multiplexes the first optical signal and the second optical signal; and a detection unit which generates a frequency-modulated signal by performing square-law detection processing on a result of multiplexing.

公开(公告)号：US20230216586A1

公开(公告)日：2023-07-06

申请号：US18009600

申请日：2020-06-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kyo MINOGUCHI ,  Toshiaki SHITABA ,  Tomoaki YOSHIDA

IPC: H04B10/2513

CPC classification number: H04B10/2513

Abstract: An optical communication system includes a first optical communication device; a plurality of second optical communication devices configured to perform communication with the first optical communication device; a chromatic dispersion compensation device connected to the first optical communication device; and an optical transmission line connected to the chromatic dispersion compensation device, a path of the optical transmission line connected to the chromatic dispersion compensation device being split into a plurality of paths at a branch point, the resulting paths being respectively connected to the plurality of second optical communication devices, and the optical transmission line being configured to transmit optical signals through the paths, in which the chromatic dispersion compensation device includes a chromatic dispersion compensator configured to perform chromatic dispersion compensation corresponding to amounts of chromatic dispersion generated in optical signals propagated through respective paths between the first optical communication device and the plurality of second optical communication devices.

公开(公告)号：US20180145788A1

公开(公告)日：2018-05-24

申请号：US15576656

申请日：2016-05-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoaki YOSHIDA ,  Shigeru KUWANO

IPC: H04J14/02 ,  H04J14/08 ,  H04Q11/00

CPC classification number: H04J14/0246 ,  H04J14/0282 ,  H04J14/086 ,  H04L12/2885 ,  H04L12/44 ,  H04Q11/0067

Abstract: A station-side device performs transmission and reception of an optical signal to and from a subscriber-side device, and includes a communication control unit configured to perform optical signal communication using a plurality of wavelengths by wavelength division multiplexing and time division multiplexing; and a registration unit configured to set an acceptance period in at least one wavelength among the plurality of wavelengths, to perform a new registration of a subscriber-side device in response to a registration request of the subscriber-side device received within the acceptance period, and not to set the acceptance period in at least one other wavelength among the plurality of wavelengths.

公开(公告)号：US20180131461A1

公开(公告)日：2018-05-10

申请号：US15564231

申请日：2016-04-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoaki YOSHIDA ,  Kota ASAKA ,  Shunji KIMURA

IPC: H04J14/02 ,  H04Q11/00 ,  H04L12/803

CPC classification number: H04J14/0247 ,  H04J14/02 ,  H04J14/0223 ,  H04L12/44 ,  H04L47/125 ,  H04L47/762 ,  H04Q11/0067 ,  H04Q2011/0083 ,  H04Q2011/0086

Abstract: In a case where a wavelength to be assigned to a subscriber-side device, to which a downstream wavelength has been assigned, is to be changed from the currently used (Source) downstream wavelength to a different changeover target (Target) downstream wavelength, a downstream wavelength changeover instruction message that indicates the change target wavelength is generated. In a case where a wavelength to be assigned to the subscriber-side device, to which an upstream wavelength has been assigned, is to be changed from the currently used (Source) upstream wavelength to a different changeover target (Target) upstream wavelength, an upstream wavelength changeover instruction message that indicates the change target wavelength is generated. The downstream wavelength changeover instruction message and the upstream wavelength changeover instruction message are respectively independently generated, and only the wavelength for which the wavelength changeover instruction message was generated is changed.

公开(公告)号：US20160269105A1

公开(公告)日：2016-09-15

申请号：US15029489

申请日：2014-10-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoaki YOSHIDA ,  Shin KANEKO ,  Shunji KIMURA

IPC: H04B10/032 ,  H04J14/08 ,  H04Q11/00 ,  H04J14/02 ,  H04L12/26

CPC classification number: H04B10/032 ,  H04B10/272 ,  H04J14/0256 ,  H04J14/0268 ,  H04J14/0282 ,  H04J14/0294 ,  H04J14/08 ,  H04L41/0663 ,  H04L43/0864 ,  H04Q11/0067 ,  H04Q2011/0016 ,  H04Q2011/0081 ,  H04Q2213/1301

Abstract: In an optical communication abnormality-recovery system and method, when an abnormality occurs in transmission and reception of one wavelength of an optical line terminal of a PON system, an optical network unit that is performing communication at a certain wavelength switches the wavelength for performing the communication to another backup wavelength that is instructed in advance. The optical line terminal also performs switching so that the communication is performed using the same backup wavelength as in the optical network unit.

Abstract translation: 在光通信异常恢复系统和方法中，当在PON系统的光线路终端的一个波长的发送和接收中发生异常时，以一定波长进行通信的光网络单元切换用于执行PON 与预先指示的另一个备用波长的通信。 光线路终端也进行与光网络单元相同的备用波长的通信。

公开(公告)号：US20240380496A1

公开(公告)日：2024-11-14

申请号：US18691149

申请日：2021-09-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo MIYATAKE ,  Kenta ITO ,  Hiroaki KATSURAI ,  Yoichi FUKADA ,  Tomoaki YOSHIDA

IPC: H04B10/80 ,  H04J14/02

Abstract: An optical communication device includes: a control signal generation unit that generates, on the basis of a communication log, a sleep cancellation signal including information about at least one time at which communication with a terminal device performing wireless communication with a power-receiving optical communication device is expected to be successful, the communication log including information about a result of communication at a time when sleep state cancellation is performed on the power-receiving optical communication device that is driven by electrical power obtained from an optical signal for power supply; and an optical communication unit that converts the generated sleep cancellation signal into an optical signal, and transmits the optical signal to the power-receiving optical communication device.

公开(公告)号：US20240162991A1

公开(公告)日：2024-05-16

申请号：US18281773

申请日：2021-04-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo MIYATAKE ,  Yoichi FUKADA ,  Toshiaki SHITABA ,  Akihiro TANABE ,  Tomoaki YOSHIDA

IPC: H04B10/516 ,  H04B10/50 ,  H04J14/00

CPC classification number: H04B10/5161 ,  H04B10/503 ,  H04J14/00

Abstract: An optical transmission device includes: a first optical phase modulator that outputs a first optical signal by phase-modulating the laser beam having a first oscillation frequency according to the first electric signal in a case where the first electric signal is output to the first transmission path, a second optical phase modulator that outputs a laser beam having a second oscillation frequency as the second optical signal in a case where the first electric signal is output to the first transmission path; an optical multiplexer/distributor that outputs a third optical signal and a fourth optical signal by multiplexing the first optical signal and the second optical signal and distributing a result of the multiplexing; a first detection unit that converts the third optical signal into a first heterodyne detection signal; a second detection unit that converts the fourth optical signal into a second heterodyne detection signal; and a first optical intensity modulator that intensity-modulates a laser beam having a third oscillation frequency according to one of the first heterodyne detection signal and the second heterodyne detection signal.

公开(公告)号：US20240056193A1

公开(公告)日：2024-02-15

申请号：US18269491

申请日：2020-12-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Akihiro TANABE ,  Toshiaki SHITABA ,  Yoichi FUKADA ,  Ryo MIYATAKE ,  Tomoaki YOSHIDA

IPC: H04B10/516

CPC classification number: H04B10/516

Abstract: An optical transmission device includes: an FM batch conversion unit that performs FM batch conversion on a carrier signal input from the outside, to generate an FM batch conversion signal; a signal branching unit that causes the FM batch conversion signal to branch into a first path and a second path; an optical transmission unit that is provided in the first path, converts the FM batch conversion signal into an optical signal, and transmits the optical signal to the outside; and a detection unit that is provided in the second path, and detects quality degradation of the FM batch conversion signal on the basis of the signal level of the FM batch conversion signal.