公开(公告)号：US20240259285A1

公开(公告)日：2024-08-01

申请号：US18560933

申请日：2021-05-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hiroshi O ,  Kota ASAKA ,  Keita NISHIMOTO

IPC: H04L43/0852

CPC classification number: H04L43/0852

Abstract: Delay measurement can be performed by a dedicated circuit without use of software. A delay measurement device includes a general-purpose processor, and a delay measurement circuit that operates according to a pre-installed circuit without use of a program. An opposing terminal communicates with the delay measurement device. The delay measurement circuit includes a measurement packet generation unit, a response packet reception unit, and a delay time calculation unit that are pre-installed. The measurement packet generation unit generates a measurement packet, transmits the measurement packet to the opposing terminal, and stores the transmission time of the measurement packet. The response packet reception unit receives a response packet from the opposing terminal. The delay time calculation unit calculates a reciprocation delay time by subtracting the transmission time from the reception time. The opposing terminal transmits the response packet when receiving the measurement packet.

公开(公告)号：US20240223295A1

公开(公告)日：2024-07-04

申请号：US18563379

申请日：2021-05-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kota ASAKA ,  Keita NISHIMOTO ,  Hiroshi O

IPC: H04J3/06 ,  H04B10/27

CPC classification number: H04J3/0661 ,  H04B10/27

Abstract: An optical communication device connected to an optical path in an optical communication network includes a controller. The controller generates an additional information signal having a carrier frequency different from a carrier frequency of a main optical signal. The controller generates an output optical signal by superimposing the additional information signal on the main optical signal, and outputs the output optical signal to the optical path. The additional information signal includes a time stamp reflecting a timing at which the additional information signal is generated.

公开(公告)号：US20220113478A1

公开(公告)日：2022-04-14

申请号：US17427866

申请日：2020-01-31

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Takeshi IMAI ,  Yumiko SENOO ,  Kota ASAKA

IPC: G02B6/42 ,  H01L31/0232

Abstract: A wavelength-selective optical reception device includes a photoreceptor (21) that converts optical signals (201) into electric signals and outputs the electric signals, a base (31) on which the photoreceptor (21) is provided, a housing (41) that is mounted on the base (31) and surrounds the photoreceptor (21) along with the base (31), and that is provided with a window (51) to pass optical signals (203) including the optical signals (201) and including optical signals (202) of a wavelength different from a first wavelength of the optical signals (201) and a window (52) to pass the optical signals (202), and an optical filter (61) that is disposed inside the housing between the window (51) and the photoreceptor (21) along the optical axis (205) of the optical signals (203), and that outputs, out of the optical signals (203) that enter thereto, the optical signals (201) toward the photoreceptor (21), and reflects the optical signals (202) toward a near side in a direction of travel of the optical signals (203).

公开(公告)号：US20210250238A1

公开(公告)日：2021-08-12

申请号：US17052884

申请日：2019-05-15

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita NISHIMOTO ,  Tomoya HATANO ,  Kota ASAKA

IPC: H04L12/24

Abstract: An information management system includes a first information storage configured to store first attribute information regarding a communication device, a second information storage configured to store second attribute information regarding the communication device, a related information storage configured to store information representing a relationship between the first attribute information and the second attribute information, a detector configured to detect update, addition, or deletion of the first attribute information or the second attribute information, and an updater configured to output a command for the update or the like of the second attribute information associated with the first attribute information to the second information storage when the update or the like of the first attribute information is detected, and to output a command for the update or the like of the first attribute information associated with the second attribute information to the first information storage when the update or the like of the second attribute information is detected.

公开(公告)号：US20160127045A1

公开(公告)日：2016-05-05

申请号：US14896067

申请日：2014-06-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kota ASAKA ,  Katsuhisa TAGUCHI ,  Hirotaka NAKAMURA

IPC: H04B10/516 ,  H04B10/564

CPC classification number: H04B10/516 ,  H04B10/505 ,  H04B10/564

Abstract: A bias point of an external modulator is set to different values according to on and off of a burst control signal and an optical source is driven continuously in a burst optical signal transmission device. The burst optical signal transmission device avoid generation of transient fluctuation of a wavelength and a light amount at the time of burst signal rising.

Abstract translation: 外部调制器的偏置点根据突发控制信号的导通和关断设置为不同的值，并且在突发光信号传输装置中连续驱动光源。 突发光信号传输装置避免在突发信号上升时产生波长的瞬态波动和光量。

公开(公告)号：US20240406952A1

公开(公告)日：2024-12-05

申请号：US18700904

申请日：2021-10-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hiroko NOMURA ,  Kenji MIYAMOTO ,  Kota ASAKA

IPC: H04W72/1263 ,  H04W72/566

Abstract: A control device includes: a scheme determination unit configured to determine whether a packet to which an identifier of a priority is assigned is transmitted in conformity with a grant-free scheme; a time estimation unit configured to estimate a time in which a traffic volume of the packet is equal to or more than a threshold; and a transfer control unit configured to generate a control signal of a signal transfer device so that the signal transfer device transfers a packet that has arrived at the signal transfer device in the estimated time in accordance with the identifier of the priority. The scheme determination unit determines whether the repeated transmission of the packet is performed. The time estimation unit estimates a time in which the plurality of packets arrive at the signal transfer device a predetermined number of times at predetermined time intervals when it is determined that the repeated transmission of the packets is performed.

公开(公告)号：US20240405909A1

公开(公告)日：2024-12-05

申请号：US18694838

申请日：2021-10-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hiroko NOMURA ,  Hirotaka UJIKAWA ,  Kenji MIYAMOTO ,  Kota ASAKA ,  Yoshihito SAKAI ,  Tatsuya SHIMADA

IPC: H04J14/02

Abstract: A control device includes an acquisition unit that acquires information from a distributed station that notifies the information related to one or more events occurred within a predetermined time period at a predetermined notification frequency, an information analysis unit that executes analysis processing on the information, a frequency derivation unit that derives an occurrence frequency of the information, a load derivation unit that derives a load of analysis processing of the information, and a frequency control unit that controls the predetermined notification frequency with a frequency lower than the occurrence frequency as an upper limit on the basis of at least one of an analysis result of the information, an occurrence frequency of the information, and a load of analysis processing of the information.

公开(公告)号：US20240305370A1

公开(公告)日：2024-09-12

申请号：US18279153

申请日：2021-03-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita NISHIMOTO ,  Kota ASAKA ,  Yukio TOYOSHIMA

IPC: H04B10/077

CPC classification number: H04B10/0775

Abstract: Provided is an optical transmission system including: an optical transmission apparatus; an optical reception apparatus; a communication device that is a delay measurement target; and a transmission device that transmits a signal between the optical reception apparatus and the communication device, in which the optical transmission apparatus includes a main signal transfer unit that transmits a main signal, the transmission device transmits, to the optical reception apparatus, a first main signal transmitted from the optical transmission apparatus and transmitted via the communication device and a second main signal transmitted from the optical transmission apparatus and not transmitted via the communication device, and the optical reception apparatus includes a reception processing unit that measures a delay occurring in the communication device by using the first main signal and the second main signal transmitted from the transmission device.

公开(公告)号：US20230056684A1

公开(公告)日：2023-02-23

申请号：US17796866

申请日：2020-02-07

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita NISHIMOTO ,  Kota ASAKA ,  Takashi YAMADA ,  Junichi KANI

IPC: H04L45/76

Abstract: A terminal function device and a proxy transfer agent device generate, on mutually-connecting physical lines, logical paths to be correlated with physical port transmitting/receiving units. In a case of receiving a signal received at one of the physical port transmitting/receiving units, the terminal function device sends the signal out to a logical path corresponding to the physical port transmitting/receiving unit that received this signal. In a case of receiving a signal through the logical path, the proxy transfer agent device correlates the signal with information identifying the physical port transmitting/receiving unit corresponding to the logical path that received this signal, and transfers the information along with the signal. Ina case of sending out a signal to the logical path, the proxy transfer agent device sends out the signal to the logical path corresponding to the physical port transmitting/receiving unit specified as a transfer destination of the signal. In a case of receiving a signal through the logical path, the terminal function device sends out the signal from the physical port transmitting/receiving unit corresponding to the logical path that received the signal.

公开(公告)号：US20170237232A1

公开(公告)日：2017-08-17

申请号：US15519170

申请日：2015-10-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kota ASAKA ,  Katsuhisa TAGUCHI

IPC: H01S5/042 ,  H04B10/50

CPC classification number: H01S5/042 ,  H01S5/0085 ,  H01S5/0427 ,  H01S5/06213 ,  H01S5/06216 ,  H01S5/12 ,  H04B10/503 ,  H04B10/54

Abstract: A burst optical signal transmission device which includes a light source for generating and outputting burst signal light, a light source driving circuit for outputting, to the light source, a driving signal for switching between an output time and a stop time of the burst signal light, based on a burst control signal, and a pre-emphasis circuit for outputting a pre-emphasis control signal for superimposing an additional signal for charging a capacitor included in the light source, onto the driving signal, at a timing in the vicinity of the beginning of the burst control signal.