公开(公告)号：US11121797B1

公开(公告)日：2021-09-14

申请号：US16984638

申请日：2020-08-04

申请人： Fujitsu Limited

发明人： Youichi Akasaka ,  Tadashi Ikeuchi

IPC分类号： H04J14/02 ,  H04B10/291

摘要： An optical system including a transmission fiber to transmit a WDM input optical signal between first and second points; a second order forward Raman pump module positioned along a first region of the transmission fiber proximate to the first point; a first order backward Raman pump module positioned along a second region of the transmission fiber proximate to the second point, the first order backward Raman pump module is configured to generate a first pumping light along the transmission fiber to amplify the WDM input optical signal at the second region of the transmission fiber, wherein the second order forward Raman pump module is configured to generate a second pumping light along the transmission fiber to amplify the first pumping light generated by the first order backward Raman pump module, wherein the amplified first pumping light amplifies the WDM input optical signal at the first region of the transmission fiber.

公开(公告)号：US11032004B1

公开(公告)日：2021-06-08

申请号：US16744908

申请日：2020-01-16

申请人： Fujitsu Limited

发明人： Youichi Akasaka ,  Tadashi Ikeuchi

IPC分类号： H04B10/2507 ,  H04J14/02 ,  H04B10/079 ,  H04B10/25

摘要： An optical system including a forward and a backward Raman pump module positioned along a transmission fiber; a noise matrix computing module configured to: determine, for first gains of the optical signal, a first noise associated with the first gain of the forward Raman pump; determine, for second gains of the optical signal, a second noise associated with the second gain of the backward Raman pump module; generate a noise matrix based on i) the first noise for each first gain of the forward Raman pump module and ii) the second noise for each second gain of the backward Raman pump module; identify a span loss of the optical signal as the optical signal is transmitted along the transmission fiber; identify a combination of a particular first gain of the forward Raman pump module and a particular second gain of the backward Raman pump module.

公开(公告)号：US20210083450A1

公开(公告)日：2021-03-18

申请号：US16569294

申请日：2019-09-12

申请人： Fujitsu Limited

发明人： Youichi Akasaka ,  Tadashi Ikeuchi

IPC分类号： H01S3/30 ,  H01S3/10

摘要： An optical system for suppressing signal noise on an optical fiber, including an input power signal; a pump laser configured to receive the input power signal; a phase modulator coupled to the pump laser configured to modulate, in response to the input power signal, a phase of the pump laser to increase a stimulated Brillouin scattering (SBS) threshold of the pump laser, wherein the pump laser is further configured to: increase a power at the pump laser to be greater than the SBS threshold; generate a back scattering power based on the power of the pump laser being greater than the increased SBS threshold; and limit an output power signal of the pump laser based on the generated back scattering power.

公开(公告)号：US10530490B1

公开(公告)日：2020-01-07

申请号：US16287409

申请日：2019-02-27

申请人： Fujitsu Limited

发明人： Olga I. Vassilieva ,  Inwoong Kim ,  Tadashi Ikeuchi

IPC分类号： H04B10/61 ,  H04B10/079 ,  H04B10/516

摘要： Systems and methods for constellation shaping of QAM modulation formats in an optical transport network may include selecting a target information rate for an optical transmission path, determining a measure of fiber nonlinearity for transmission media on the path, and selecting, dependent on the measure of fiber nonlinearity, one of multiple supported shaping parameter pairs, each specifying a respective shaping strength level and a respective error correction strength level. A network management system may configure optical transponders to apply probabilistic shaping to a QAM modulation format in accordance with the selected shaping parameter pair. A shaping parameter pair specifying a high shaping strength level and a low error correction strength level may be selected when the measure of fiber nonlinearity is high. A shaping parameter pair specifying a low shaping strength level and a high error correction strength level may be selected when the measure of fiber nonlinearity is low.

公开(公告)号：US10432552B2

公开(公告)日：2019-10-01

申请号：US15977942

申请日：2018-05-11

申请人： Fujitsu Limited

发明人： Qiong Zhang ,  Paparao Palacharla ,  Weisheng Xie ,  Qingya She ,  Tadashi Ikeuchi

IPC分类号： H04L29/08 ,  H04L12/915 ,  H04L12/911 ,  G06F9/50 ,  H04L12/725

摘要： A resource orchestration framework may include vertices representing physical network nodes and a resource orchestrator. The resource orchestrator may obtain a service function chain specifying, for multiple service functions, mappings of the service functions to respective physical nodes along a specified forwarding path, and a first starting time at which to instantiate resources for a first service function in the chain on the first mapped physical node. The resource orchestrator may instantiate the resources for the first service function on the first mapped physical node at the first starting time, prior to arrival of a first packet in a packet flow for the service function chain at the first mapped physical node and, subsequently, instantiate resources for a second service function in the chain on the second mapped physical node at a second starting time, prior to arrival of the first packet at the second mapped physical node.

公开(公告)号：US10243835B2

公开(公告)日：2019-03-26

申请号：US15423167

申请日：2017-02-02

申请人： Fujitsu Limited

发明人： Xi Wang ,  Qiong Zhang ,  Paparao Palacharla ,  Victor Mehmeri ,  Tadashi Ikeuchi

IPC分类号： H04L12/715 ,  H04L12/851 ,  H04L12/24 ,  H04L29/08 ,  H04L12/741

摘要： In one or more embodiments, one or more systems, methods, and/or processes may receive a service function chain description that includes service functions associated with multiple domains, and rather than any of the domains ignoring or rejecting outside nodes, nodes may be configured to communicate with the outside nodes in implementing a service function chain associated with the service function chain description. For example, an arbiter (e.g., a central arbiter) may provide control information and/or configuration information, based on the service function chain description, to one or more systems of each domain. In one instance, the arbiter may provide the control information and/or the configuration information to a border node of each domain. In another instance, the arbiter may provide the control information and/or the configuration information to a domain controller of each domain.

公开(公告)号：US10148552B2

公开(公告)日：2018-12-04

申请号：US15169313

申请日：2016-05-31

申请人： Fujitsu Limited

发明人： Inwoong Kim ,  Xi Wang ,  Qiong Zhang ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： H04L12/721 ,  H04Q11/00

摘要： Methods and systems are provided for determining a shortest path with a constraint in an optical network. The method includes identifying a permitted number of events defined by the constraint. The method further includes creating virtual nodes for each node in the optical network, the virtual nodes corresponding with the permitted number of events. The method also includes traversing the virtual nodes from a source node to a destination node with a shortest path algorithm, wherein traversing the virtual nodes comprises creating virtual links between the virtual nodes when the constraint is not violated, the virtual link corresponding with a physical link; and identifying a shortest path between the source node and the destination node from the virtual links, the shortest path not violating the constraint.

公开(公告)号：US20180262443A1

公开(公告)日：2018-09-13

申请号：US15977942

申请日：2018-05-11

申请人： Fujitsu Limited

发明人： Qiong Zhang ,  Paparao Palacharla ,  Weisheng Xie ,  Qingya She ,  Tadashi Ikeuchi

IPC分类号： H04L12/915 ,  H04L12/911 ,  H04L29/08 ,  G06F9/50

CPC分类号： H04L47/786 ,  G06F9/5038 ,  H04L45/306 ,  H04L47/826 ,  H04L67/322 ,  H04L67/325

摘要： A resource orchestration framework may include vertices representing physical network nodes and a resource orchestrator. The resource orchestrator may obtain a service function chain specifying, for multiple service functions, mappings of the service functions to respective physical nodes along a specified forwarding path, and a first starting time at which to instantiate resources for a first service function in the chain on the first mapped physical node. The resource orchestrator may instantiate the resources for the first service function on the first mapped physical node at the first starting time, prior to arrival of a first packet in a packet flow for the service function chain at the first mapped physical node and, subsequently, instantiate resources for a second service function in the chain on the second mapped physical node at a second starting time, prior to arrival of the first packet at the second mapped physical node.

公开(公告)号：US20180262431A1

公开(公告)日：2018-09-13

申请号：US15977922

申请日：2018-05-11

申请人： Fujitsu Limited

发明人： Qiong Zhang ,  Qingya She ,  Weisheng Xie ,  Paparao Palacharla ,  Tadashi Ikeuchi

IPC分类号： H04L12/813 ,  H04L29/08 ,  H04L12/803 ,  G06F9/455

CPC分类号： H04L47/20 ,  G06F9/45558 ,  G06F2009/45595 ,  H04L41/0806 ,  H04L41/0896 ,  H04L43/08 ,  H04L47/125 ,  H04L67/10 ,  H04L67/327

摘要： A resource orchestration framework may include vertices representing physical network nodes and a resource orchestrator. The resource orchestrator may receive a service function chain request specifying service functions to perform on respective physical nodes and a first starting time for launching a first one of the service functions. The resource orchestrator may determine an ending time for performing the first service function that, with the first starting time, defines a time duration for the first service function, identify vertices at which the first service function is available during the time duration, map a first vertex to the first service function in a candidate service function chain, determine a second starting time for launching a second one of the service functions dependent on the first starting time, and provide the candidate service function chain, the first starting time, and the second starting time to a neighbor vertex of the first vertex.

公开(公告)号：US20180227243A1

公开(公告)日：2018-08-09

申请号：US15424398

申请日：2017-02-03

申请人： Fujitsu Limited

发明人： Qiong Zhang ,  Paparao Palacharla ,  Tadashi Ikeuchi ,  Xi Wang ,  Inwoong Kim

IPC分类号： H04L12/915 ,  H04L12/713 ,  H04L12/931 ,  H04L12/24 ,  H04L12/911

CPC分类号： H04L47/785 ,  H04L41/12 ,  H04L43/0852 ,  H04L43/0876 ,  H04L43/16 ,  H04L45/586 ,  H04L47/827 ,  H04L49/70

摘要： Systems and methods for performing distributed virtual network embedding are disclosed. A resource orchestrator may receive a virtual network request specifying a set of virtual nodes, a set of virtual links, each connecting two virtual nodes in a mesh topology, and resource requirements for some virtual nodes. The orchestrator may partition the virtual network request into multiple sub-requests, each specifying a linear topology for a subset of the virtual nodes and links within the mesh topology. The sub-requests may collectively include all virtual links within the mesh topology with no overlapping links. Resource orchestrators may collaborate to compute, independently for each sub-request, a respective chaining solution in which each virtual node is mapped to a physical node having resources sufficient to implementing the virtual node. A resource orchestrator may combine the respective chaining solutions for each of the sub-requests to generate a mapping solution for the virtual network request.