公开(公告)号：US20240187099A1

公开(公告)日：2024-06-06

申请号：US18285926

申请日：2021-04-14

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shin KANEKO ,  Junichi KANI ,  Kazutaka HARA ,  Takuya KANAI

IPC: H04B10/27 ,  H04B10/58

CPC classification number: H04B10/27 ,  H04B10/58

Abstract: 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：US20230344522A1

公开(公告)日：2023-10-26

申请号：US18026550

申请日：2020-09-23

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Masamichi FUJIWARA ,  Takuya KANAI

IPC: H04B10/61

CPC classification number: H04B10/61

Abstract: A coherent optical reception device includes a coherent receiver that receives signal light in which an AMCC signal is superimposed on a main signal, converts the signal light into an analog electric signal, and outputs an in-phase component and a quadrature-phase component of a reception signal for each polarization state, and a polarization combiner that performs polarization combining on the in-phase component and the quadrature-phase component of the reception signal output from the coherent receiver for each polarization state and outputs the reception signal as an AMCC signal identification reception signal that is the reception signal used for identification of the AMCC signal and a main signal identification reception signal that is the reception signal used for identification of the main signal.

公开(公告)号：US20230163856A1

公开(公告)日：2023-05-25

申请号：US17921253

申请日：2020-05-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Shin KANEKO ,  Kazuaki HONDA ,  Junichi KANI ,  Hiroo SUZUKI ,  Jun TERADA

IPC: H04B10/60 ,  H04B10/077

CPC classification number: H04B10/60 ,  H04B10/077

Abstract: An optical signal processing apparatus includes a removal unit and a superimposition unit. The removal unit receives, from a first optical transmission path, an optical signal converted from an electrical signal, in which a first signal and a second signal having different frequencies from each other have been superimposed, and removes the second signal from the optical signal which has been input. The superimposition unit superimposes a third signal having a frequency different from a frequency of the first signal on the optical signal in which the second signal has been removed by the removal unit, and outputs the optical signal in which the third signal has been superimposed to a second optical transmission path.

公开(公告)号：US20210399809A1

公开(公告)日：2021-12-23

申请号：US17271169

申请日：2019-08-30

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Masamichi FUJIWARA ,  Takuya KANAI

IPC: H04B10/61 ,  H04B10/077 ,  H04L27/20 ,  H04L27/22

Abstract: Upon receipt of a coherent optical signal that includes a training signal generated using a code sequence constituted by multi-value phase modulation symbols, in which a deviation angle of a vector average of a one-symbol delay differential component of a signal generated on the basis of the code sequence has a prescribed angle and a modulation phase difference between adjacent symbols has a fixed, repeated pattern, a reception training signal corresponding to a training code sequence for frequency offset estimation is detected within a reception signal acquired by converting the received coherent optical signal into an electric signal, a plurality of delay differential components are calculated on the basis of the detected reception training signal and at least two delay signals of the reception training signal, each delay signal having a different number of delay symbols, and an averaged frequency offset amount is calculated using the calculated plurality of delay differential components.

公开(公告)号：US20250088269A1

公开(公告)日：2025-03-13

申请号：US18721550

申请日：2021-12-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yasunari TANAKA ,  Kazutata HARA ,  Takuya KANAI ,  Shin KANEKO ,  Yumiko SENOO ,  Junichi KANI

IPC: H04B10/079 ,  H04B10/25

Abstract: One aspect of the present invention is an optical communication control device including an acquisition unit that acquires an optical power of an optical signal transmitted from a transmission device, a derivation unit that derives an attenuation amount for setting the optical power of the optical signal transmitted from the transmission device to an optical power receivable by a receiver device in a case in which the optical power acquired by the acquisition unit exceeds the optical power receivable by the receiver device, and an attenuation unit that causes an attenuator that attenuates the optical power of the optical signal transmitted from the transmission device to attenuate the optical power with the attenuation amount derived by the derivation unit.

公开(公告)号：US20240381012A1

公开(公告)日：2024-11-14

申请号：US18286401

申请日：2021-04-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazutaka HARA ,  Junichi KANI ,  Shin KANEKO ,  Takuya KANAI ,  Yumiko SENOO

IPC: H04Q11/00

Abstract: Provided is an optical access system that performs communication using an optical signal on which a management control signal used for management and control is superimposed, the optical access system including: a subscriber device on a transmitting side that generates an optical signal by superimposing the management control signal on a main signal and transmits the generated optical signal; a management control unit that outputs a management control signal which is superimposed on the optical signal transmitted by the subscriber device on the transmitting side and which has a frequency band different from a frequency of the management control signal superimposed on the optical signal; and a control signal superimposing unit that superimposes the management control signal output from the management control unit on the optical signal.

公开(公告)号：US20240372625A1

公开(公告)日：2024-11-07

申请号：US18561416

申请日：2021-05-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Kazuaki HONDA ,  Yasunari TANAKA ,  Shin KANEKO ,  Kazutaka HARA

IPC: H04B10/516 ,  H04J3/00

Abstract: One mode of the present invention is an optical communication device that includes: a detector that detects the falling edge or the rising edge of a control signal outputted from a user device to an optical communication path; and an optical modulator that superimposes a new control signal on a main signal, when the falling edge or the rising edge of a control signal has been detected by the detector.

公开(公告)号：US20230361876A1

公开(公告)日：2023-11-09

申请号：US18028414

申请日：2020-09-30

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yasunari TANAKA ,  Junichi KANI ,  Hiroo SUZUKI ,  Takuya KANAI

IPC: H04B10/25 ,  H04B10/40

CPC classification number: H04B10/2589 ,  H04B10/40

Abstract: An optical communication system includes: an optical fiber including a plurality of cores formed in parallel to a longitudinal direction; a first optical communication device including an optical transmission unit and an optical reception unit, and provided with connection ends of the optical transmission unit and the optical reception unit each connected to one end of any one of the cores on an interface surface; and a second optical communication device including an optical transmission unit and an optical reception unit, and provided with connection ends of the optical transmission unit and the optical reception unit each connected to another end of any one of the cores on an interface surface, in which the connection ends are provided in an arrangement in which a type of transmission and reception of one of the connection ends of the first optical communication device and a type of transmission and reception of one of the connection ends of the second optical communication device are a transmission and reception pair, the one of the connection ends of the first optical communication device and the one of the connection ends of the second optical communication device being in a line-symmetric positional relationship with respect to a vertical line to a horizontal plane of when the first optical communication device and the second optical communication device are installed on the horizontal plane such that the interface surfaces of the first optical communication device and the second optical communication device face a front.

公开(公告)号：US20230030158A1

公开(公告)日：2023-02-02

申请号：US17788537

申请日：2020-09-29

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Hiroo SUZUKI ,  Junichi KANI ,  Shin KANEKO ,  Kazuaki HONDA ,  Manabu YOSHINO ,  Tomoaki YOSHIDA

IPC: H04B10/291 ,  H04B10/27

Abstract: An optical communication apparatus includes an optical switch, a wavelength management control unit, and an optical switch control unit. The optical switch is connected to a plurality of transmission lines and outputs an optical signal input from one of the transmission lines to another of the transmission lines. The wavelength management control unit assigns a wavelength to a subscriber terminal according to a communication destination. The optical switch control unit controls the optical switch such that it outputs an optical signal transmitted from the subscriber terminal, to which a wavelength has been assigned, to a transmission line corresponding to its forwarding destination on a path to the communication destination.

公开(公告)号：US20250016479A1

公开(公告)日：2025-01-09

申请号：US18708949

申请日：2021-12-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04Q11/00 ,  H04B10/27

Abstract: An optical node device to which a first subscriber device and a second subscriber device are connected in an optical communication system in which the first subscriber device and the second subscriber device are mixed, the first subscriber device being connected by one core using different wavelengths in transmission and reception, the second subscriber device being connected by two cores using the same wavelength in transmission and reception, the optical node device including: a transmission/reception separator that transfers an optical signal transmitted from the first subscriber device and an optical signal addressed to the first subscriber device without interference; and an optical switch that controls a connection relationship between ports such that an optical signal transmitted from the first subscriber device or an optical signal addressed to the first subscriber device passes through the transmission/reception separator and an optical signal transmitted from the second subscriber device or an optical signal addressed to the second subscriber device does not pass through the transmission/reception separator, and outputs an optical signal input from a certain optical transmission line from another optical transmission line.