公开(公告)号：US20240413907A1

公开(公告)日：2024-12-12

申请号：US18699923

申请日：2022-08-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Shin KANEKO ,  Masahisa KAWASHIMA

IPC: H04B10/27 ,  H04B10/294

Abstract: An optical communication device includes: a plurality of first distribution units that is connected to a plurality of optical transmission lines and outputs an optical signal input from any of first devices to any of the optical transmission lines; a plurality of second distribution units that is connected to a plurality of optical transmission lines and outputs an optical signal input from any of the optical transmission lines to any of second devices; and a multicast transfer unit configured to perform multicast transfer of the optical signal transmitted from the first device connected to any of the plurality of first distribution units to any of the plurality of second distribution units connected to the one or more second devices.

公开(公告)号：US20240388821A1

公开(公告)日：2024-11-21

申请号：US18691749

申请日：2021-09-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04Q11/00 ,  H04J14/02 ,  H04L41/34

Abstract: An optical communication system including: a management control device that manages communication between one or more first subscriber devices and one or more second subscriber devices that are provided at counterpart locations of the one or more first subscriber devices, in which the management control device includes a control signal generation unit that generates a control signal that is transmitted to the one or more first subscriber devices and used for management and control, and an optical transmission unit that converts the control signal generated by the control signal generation unit into an optical signal with a wavelength that is different from a wavelength of a main signal transmitted by the one or more second subscriber devices that perform communication with the one or more first subscriber devices and transmits the optical signal, and the optical communication system includes an optical multiplexing unit that is provided on a communication path between the one or more first subscriber devices and the one or more second subscriber devices and multiplexes the main signal transmitted by the one or more second subscriber devices with the optical signal transmitted from the optical transmission unit.

公开(公告)号：US20230421283A1

公开(公告)日：2023-12-28

申请号：US18035900

申请日：2020-11-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yumiko SENOO ,  Shin KANEKO ,  Ryo KOMA ,  Kazuaki HONDA

IPC: H04J14/08

CPC classification number: H04J14/08

Abstract: An optical communication device that communicates with another optical communication device by using at least a time division multiplexing system, the optical communication device including: a management control signal division unit that divides a management control signal used for management and control; and a transmission unit that transmits the management control signal divided, by including the management control signal divided in a burst signal to be transmitted at an assigned transmission timing.

公开(公告)号：US20230170999A1

公开(公告)日：2023-06-01

申请号：US17919595

申请日：2020-04-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04B10/516 ,  H04J14/00

CPC classification number: H04B10/516 ,  H04J14/00

Abstract: An aspect of the present disclosure is a transmission system including a modulated wave generation unit that generates an intermediate wave, which is a coherent wave in which a frequency component of either of two signals overlays a frequency spectrum, the two signals being a main signal indicating transmitted information to be transmitted and a control signal indicating management information, which is information on communication between a transmission source of the transmitted information and a communication destination of the transmission source, and a modulation unit that modulates the intermediate wave with a signal in which a frequency component does not overlay the frequency spectrum of the coherent wave generated by the modulated wave generation unit out of the two signals that are the main signal and the control signal. In the transmission system, a frequency band of the main signal and a frequency band of the control signal do not overlap each other.

公开(公告)号：US20230155712A1

公开(公告)日：2023-05-18

申请号：US17908223

申请日：2020-03-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Rintaro HARADA ,  Hirotaka UJIKAWA ,  Shin KANEKO ,  Jun TERADA

IPC: H04J14/02 ,  H04B10/272

CPC classification number: H04J14/0206 ,  H04B10/272 ,  H04J14/0213

Abstract: A wavelength multiplexing communication system includes a master station apparatus and a plurality of slave station apparatuses. The master station apparatus includes a wavelength multiplexing communication unit that performs wavelength multiplexing communication with the plurality of slave station apparatuses by wavelengths the number of which is equal to or less than the number of the plurality of slave station apparatuses using an optical signal of a wavelength in a first wavelength group and an optical signal of a wavelength in a second wavelength group. The slave station apparatuses include an optical communication unit that performs communication of the main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, which is different from a wavelength in the first wavelength group used by another slave station when the main signal communication is performed in the host slave station apparatus, and performs communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the second wavelength group, which is a wavelength same as a wavelength used by another slave station apparatus when the main signal communication is not performed in the host slave station apparatus.

公开(公告)号：US20170170923A1

公开(公告)日：2017-06-15

申请号：US15327449

申请日：2015-07-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoaki YOSHIDA ,  Shin KANEKO ,  Shunji KIMURA

IPC: H04J14/02 ,  H04B10/272 ,  H04L12/44 ,  H04B10/077 ,  H04J14/08 ,  H04L7/00

CPC classification number: H04J14/0278 ,  H04B10/077 ,  H04B10/272 ,  H04J14/0246 ,  H04J14/0269 ,  H04J14/0272 ,  H04J14/0282 ,  H04J14/08 ,  H04L7/0075 ,  H04L12/44

Abstract: A transmission start time correction method of a WDM/TDM-PON system includes: a completion instruction procedure in which a station-side subscriber accommodation apparatus issues an instruction using a downstream signal for instructing a subscriber apparatus to perform wavelength switching, the downstream signal including a transmission start time of an upstream signal indicating completion of the wavelength switching of the subscriber apparatus, the upstream signal being transmitted by the subscriber apparatus after the wavelength switching; an instruction completion transmission procedure in which the subscriber apparatus transmits the upstream signal indicating the completion of the wavelength switching at a wavelength after switching at the instructed transmission start time after the wavelength switching is completed in accordance with the instruction; and a transmission start time correction procedure in which the station-side subscriber accommodation apparatus measures a reception time of the upstream signal indicating the completion of the wavelength switching received after the wavelength switching and sets a time obtained by adding a time twice a time difference between a reception time of the upstream signal indicating the completion of the wavelength switching assumed before the wavelength switching and a reception time of the upstream signal indicating the completion of the wavelength switching received after the wavelength switching to the transmission start time of the upstream signal before the wavelength switching as a new transmission start time.

公开(公告)号：US20150326337A1

公开(公告)日：2015-11-12

申请号：US14655310

申请日：2013-12-06

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoaki YOSHIDA ,  Shinya TAMAKI ,  Shin KANEKO

IPC: H04J14/02 ,  H04Q11/00

CPC classification number: H04J14/0247 ,  H04J14/0252 ,  H04L12/44 ,  H04L12/6418 ,  H04Q11/0067 ,  H04Q2011/0016 ,  H04Q2011/0064 ,  H04Q2011/0086

Abstract: When dynamic wavelength bandwidth allocation using a fixed cycle such as a multiple request method is realized in wavelength tunable WDM/TDM-PON, there is required a wavelength switching method that can suppress a transmission delay of an uplink signal and an increase in burst characteristics, that is, suppress an increase in an allocation cycle to a minimum.An ONU requests a bandwidth of an uplink signal, and in accordance with this, an OLT calculates a time when the OLT transmits the uplink signal and a transmission duration time and performs an instruction, and a DBA cycle in which the ONU transmits the uplink signal in accordance with the instruction and a dynamic wavelength allocation cycle in which the OLT instructs wavelength switching, and the ONU switches the wavelength and belongs to a different LC are separated. While the ONU switches the wavelength, the DBA cycles can be performed plural times in the ONU whose wavelength is not switched, the switching of the wavelength is confirmed after the wavelength has been switched, and then DBA operation is performed at the switched wavelength.

Abstract translation: 在波长可调WDM / TDM-PON中实现使用诸如多请求方法等固定周期的动态波长带宽分配时，需要能够抑制上行链路信号的传输延迟和突发特性的增加的波长切换方法， 即将分配周期的增加抑制到最小。 ONU请求上行链路信号的带宽，根据这一点，OLT计算OLT发送上行链路信号的时间和发送持续时间并执行指令，以及ONU发送上行链路信号的DBA周期 根据指令和OLT指示波长切换的动态波长分配周期，并且ONU切换波长并属于不同的LC被分离。 当ONU切换波长时，可以在波长不被切换的ONU中进行多次DBA周期，在切换波长后确认波长切换，然后在切换波长下进行DBA运算。