公开(公告)号：US20190037288A1

公开(公告)日：2019-01-31

申请号：US16077136

申请日：2017-02-08

Applicant: NEC CORPORATION

Inventor： Shinsuke FUJISAWA ,  Akio TAJIMA ,  Hitoshi TAKESHITA ,  Tomoyuki HINO

IPC: H04Q11/00

Abstract: In the elastic optical network, there has been the problem that processing steps increase that are required to re-optimize client signals to be concentrated; therefore, an optical network controller according to an exemplary aspect of the present invention includes reallocation detection means for monitoring an operation status of at least one of an optical communication channel and an optical node device that constitute an optical network, and determining, based on the operation status, whether or not to reallocate a client signal accommodated in an optical path set in the optical network; design-candidate exclusion means for designating, as a design exclusion object, at least one of the optical communication channel and the optical node device that are associated with an optical path targeted for reallocation that accommodates the client signal that the reallocation detection means has determined to reallocate; optical path design means for determining an alternative route for the optical path targeted for reallocation from among routes with the exception of the design exclusion object; traffic reference means for determining the client signal to be reaccommodated in an optical path on the alternative route, referring to demand traffic accommodated in the optical path targeted for reallocation; and line concentration design means for constituting line-concentration traffic in which traffic having been allocated to the alternative route and the demand traffic are concentrated, wherein the traffic reference means determines a reallocation optical path in which an optical path candidate with number of occupied wavelength slots increasing is excluded from optical path candidates on the alternative route, and the optical path design means determines wavelength allocation of the reallocation optical path so as to accommodate the line-concentration traffic.

公开(公告)号：US20160173304A1

公开(公告)日：2016-06-16

申请号：US14906632

申请日：2013-07-31

Applicant: NEC CORPORATION

Inventor： Emmanuel LE TAILLANDIER DE GABORY ,  Daisaku OGASAHARA ,  Shinsuke FUJISAWA

IPC: H04L27/20 ,  H04B10/556 ,  H04B10/50

CPC classification number: H04L27/2096 ,  H04B10/5057 ,  H04B10/50575 ,  H04B10/50595 ,  H04B10/5561 ,  H04L25/06

Abstract: To provide signal generating apparatus that is capable of controlling the DC bias of the optical modulator applicable to various kinds of modulation format, a signal processing apparatus includes a digital processing unit for deserializing an input digital data into parallel data lanes, for comparing the value of the digital data of symbol rate F to at least one predetermined threshold value, for selecting an offset value based on the result of the comparison; and for adding the selected offset value to the digital data, a converting unit for converting the digital data added the offset value to analog signals in each lane; an optical modulating unit for modulating a lightwave according to the analog signals with predetermined modulation format at the symbol rate F, where the modulated signal contains a frequency component at F/N.

Abstract translation: 为了提供能够控制适用于各种调制格式的光调制器的DC偏置的信号发生装置，信号处理装置包括用于将输入数字数据反序列化为并行数据通道的数字处理单元，用于将 符号率F的数字数据至少一个预定阈值，用于基于比较结果选择偏移值; 并且将所选择的偏移值添加到数字数据;转换单元，用于将添加了偏移值的数字数据转换成每个通道中的模拟信号; 光调制单元，用于按照符号率F的具有预定调制格式的模拟信号调制光波，其中调制信号包含F / N的频率分量。

公开(公告)号：US20190238451A1

公开(公告)日：2019-08-01

申请号：US16338549

申请日：2017-10-04

Applicant: NEC Corporation

Inventor： Shinsuke FUJISAWA ,  Hitoshi TAKESHITA ,  Akio TAJIMA

IPC: H04L12/703 ,  H04L12/721 ,  H04L12/725

CPC classification number: H04L45/28 ,  H04L45/123 ,  H04L45/302

Abstract: An optical network control device includes: a path setting unit that sets, based on topology information including a connection relationship among a plurality of nodes and a first route selection index value of routes each connecting the plurality of nodes, a first path for a route having the first route selection index value being minimum from among route candidates linking a start point node and an end point node of a requested traffic; a topology information modification unit that calculates a second route selection index value acquired by increasing the first route selection index value of the route that accommodates the first path; and a path selection unit that selects a second path for a route having the second route selection index value being minimum from among the route candidates.

公开(公告)号：US20190037289A1

公开(公告)日：2019-01-31

申请号：US16078103

申请日：2017-02-20

Applicant: NEC CORPORATION

Inventor： Hitoshi TAKESHITA ,  Shinsuke FUJISAWA ,  Tomoyuki HINO ,  Akio TAJIMA

IPC: H04Q11/00 ,  H04B10/27

CPC classification number: H04Q11/0062 ,  H04B10/27 ,  H04J14/0256 ,  H04J14/0272 ,  H04Q2011/0073 ,  H04Q2011/0086

Abstract: It is difficult to improve the usage efficiency of an optical communication network due to the passband narrowing effect in a wavelength selection process in an optical communication network using a wavelength division multiplexing system; therefore, an optical network management apparatus according to an exemplary aspect of the present invention includes wavelength selection information generating means for generating wavelength selection information on a wavelength selection process through which an optical path accommodating an information signal goes, with respect to each optical path; and wavelength selection information notifying means for notifying an optical node device through which the optical path goes of the wavelength selection information.

公开(公告)号：US20250070877A1

公开(公告)日：2025-02-27

申请号：US18726472

申请日：2022-01-18

Applicant: NEC Corporation

Inventor： Ankith VINAYACHANDRAN ,  Shinsuke FUJISAWA ,  Naoto ISHII ,  Hidemi NOGUCHI ,  Emmanuel LE TAILLANDIER DE GABORY

IPC: H04B10/2507 ,  H04B10/58 ,  H04B10/60

Abstract: A calibration apparatus trains a first machine learning-based model with a first training dataset to determine configuration parameters of an intermediate pre-distortion compensator in an optical communication system that includes a transmitter, a receiver, and an optical communication channel. The transmitter includes a pre-distortion compensator, the intermediate pre-distortion compensator, and an MZM compensator. The calibration apparatus trains a second machine learning-based model with a second training dataset to determine configuration parameters of the post-distortion compensator in the receiver. The calibration apparatus trains a third machine learning-based model with a third training dataset to determine configuration parameters of the pre-distortion compensator. When generating the second training data, the intermediate pre-distortion compensator is configured with the configuration parameters generated using the first machine learning-based model. When generating the third training data, the post-distortion compensator is configured with the configuration parameters generated using the second machine learning-based model.

公开(公告)号：US20240405875A1

公开(公告)日：2024-12-05

申请号：US18804520

申请日：2024-08-14

Applicant: NEC Corporation

Inventor： Hitoshi TAKESHITA ,  Shinsuke FUJISAWA ,  Tomoyuki HINO ,  Akio TAJIMA

IPC: H04B10/275 ,  H04B10/03 ,  H04B10/079 ,  H04J14/02 ,  H04L12/437

Abstract: In a multi-layer network, a control load in the upper layer network increases, and the usage efficiency and the reliability of the entire network decrease; therefore, a multi-layer network system according to an exemplary aspect of the present invention includes a first network manager configured to set a logical path in a first network layer; and a second network manager configured to set a physical path corresponding to the logical path, in a second network layer, wherein the second network manager includes a network information storage configured to store physical network information including physical route information and transmission characteristic information on the second network layer, and the first network manager sets the logical path based on the physical network information.

公开(公告)号：US20210058157A1

公开(公告)日：2021-02-25

申请号：US17091557

申请日：2020-11-06

Applicant: NEC Corporation

Inventor： Hitoshi TAKESHITA ,  Shinsuke FUJISAWA ,  Tomoyuki HINO ,  Akio TAJIMA

IPC: H04B10/275 ,  H04J14/02 ,  H04L12/437 ,  H04B10/03 ,  H04B10/079

Abstract: In a multi-layer network, a control load in the upper layer network increases, and the usage efficiency and the reliability of the entire network decrease; therefore, a multi-layer network system according to an exemplary aspect of the present invention includes a first network manager configured to set a logical path in a first network layer; and a second network manager configured to set a physical path corresponding to the logical path, in a second network layer, wherein the second network manager includes a network information storage configured to store physical network information including physical route information and transmission characteristic information on the second network layer, and the first network manager sets the logical path based on the physical network information.

公开(公告)号：US20170353244A1

公开(公告)日：2017-12-07

申请号：US15537501

申请日：2015-12-15

Applicant: NEC Corporation

Inventor： Hitoshi TAKESHITA ,  Shinsuke FUJISAWA ,  Tomoyuki HINO ,  Akio TAJIMA

IPC: H04B10/275 ,  H04B10/03 ,  H04B10/079 ,  H04J14/02

CPC classification number: H04B10/275 ,  H04B10/03 ,  H04B10/0795 ,  H04J14/02 ,  H04J14/0257 ,  H04L12/437

Abstract: In a multi-layer network, a control load in the upper layer network increases, and the usage efficiency and the reliability of the entire network decrease; therefore, a multi-layer network system according to an exemplary aspect of the present invention includes a first network manager configured to set a logical path in a first network layer; and a second network manager configured to set a physical path corresponding to the logical path, in a second network layer, wherein the second network manager includes a network information storage configured to store physical network information including physical route information and transmission characteristic information on the second network layer, and the first network manager sets the logical path based on the physical network information.

公开(公告)号：US20170302370A1

公开(公告)日：2017-10-19

申请号：US15513450

申请日：2015-09-15

Applicant: NEC Corporation

Inventor： Shinsuke FUJISAWA ,  Hitoshi TAKESHITA ,  Tomoyuki HINO ,  Akio TAJIMA

IPC: H04B10/03 ,  H04Q11/00 ,  H04B10/40

CPC classification number: H04B10/03 ,  H04B10/032 ,  H04B10/40 ,  H04Q11/0062 ,  H04Q2011/0073 ,  H04Q2011/0081

Abstract: It is difficult in an optical network to achieve fault recovery in case of multiple failures without decreasing the usage efficiency of the optical network; therefore, an optical communication system according to an exemplary aspect of the present invention includes an optical network management device including an optical path setting means for setting, to a physical route differing from each other, a backup path corresponding to each of a plurality of active paths on an identical physical route, and a failure-case optical path setting means for setting a failure-case backup path with a compressed band of the backup path, to a physical route without a failure in a case where failures arising on more than one physical route among the physical routes; and an optical node device including an optical transceiver means for transmitting and receiving optical signals using failure-case backup path information resulting from setting by the failure-case optical path setting means.

公开(公告)号：US20170054506A1

公开(公告)日：2017-02-23

申请号：US15305753

申请日：2015-04-15

Applicant: NEC Corporation

Inventor： Hitoshi TAKESHITA ,  Shinsuke FUJISAWA ,  Tomoyuki HINO ,  Akio TAJIMA

IPC: H04B10/27 ,  H04J14/02

CPC classification number: H04B10/27 ,  H04J14/02 ,  H04J14/0224 ,  H04J14/0241 ,  H04L12/28 ,  H04L12/6418

Abstract: In an optical network based on a dense wavelength division multiplexing system using a flexible frequency grid, it is difficult to improve the usage efficiency of an optical frequency band owing to the occurrence of fragmentation of the optical frequency band; therefore, an optical network controller according to an exemplary aspect of the present invention includes an optical frequency region setting means for setting a plurality of optical frequency regions in an optical frequency band used in an optical network based on a dense wavelength division multiplexing system using a flexible frequency grid; an optical path setting means for setting optical paths having a common attribute in at least one of the plurality of optical frequency regions; and an optical frequency region control means for changing an optical frequency width of the optical frequency region, and instructing the optical frequency region setting means to reconfigure, as the plurality of optical frequency regions, a plurality of optical frequency reconfigured regions each of which having the optical frequency width after having been changed.

Abstract translation: 在基于使用柔性频率网格的密集波分复用系统的光网络中，由于光频带的碎裂的发生，难以提高光频带的使用效率; 因此，根据本发明的示例性方面的光网络控制器包括：光频域设定装置，用于基于使用密度波分复用系统的密集波分复用系统，在光网络中使用的光频带中设置多个光频区域 灵活的频率网格; 光路设定装置，用于设置在所述多个光频区域中的至少一个中具有公共属性的光路; 以及光频区域控制装置，用于改变光频区域的光频宽度，并且指示光频区域设置装置将多个光频重新配置区域重新配置为多个光频重新配置区域， 改变后的光频宽度。