公开(公告)号：US10686546B2

公开(公告)日：2020-06-16

申请号：US16449618

申请日：2019-06-24

Applicant: Cisco Technology, Inc.

Inventor： Alberto Arnaldo Tanzi ,  Stefano Piciaccia ,  Maurizio Gazzola ,  Lorenzo Ghioni

IPC: H04J14/00 ,  H04J14/02 ,  H04B10/079 ,  H04Q11/00

Abstract: A network controller controls optical nodes configured to communicate with each other at multiple line rates using different tuples of [bits/symbol, symbol rate] for each line rate. The network controller determines multiple paths between two optical nodes, selects a desired line rate at which to communicate between the two optical nodes, and accesses a path database that indicates an available optical bandwidth and an available optical signal-to-noise ratio (SNR) along each path. The network controller determines feasible paths among the paths. To do this, the network controller, for each path, searches the different tuples of the desired line rate for a tuple for which a desired optical bandwidth and a desired optical SNR are accommodated by the available optical bandwidth and the available optical SNR of the path, respectively. The network controller programs optical nodes of one of the feasible paths with a tuple found in the searching.

公开(公告)号：US20190319702A1

公开(公告)日：2019-10-17

申请号：US15952345

申请日：2018-04-13

Applicant: Cisco Technology, Inc.

Inventor： Maurizio Gazzola ,  Stefano Piciaccia ,  Lorenzo Ghioni ,  Ronald Johnson ,  Alberto Arnaldo Tanzi ,  Sushin Suresan Adackaconam

IPC: H04B10/075 ,  H04B10/073 ,  H04J14/02

Abstract: Techniques for automatic bandwidth optimization of an optical communication channel in an optical network are provided. In one embodiment, a method of automatically optimizing bandwidth includes receiving, at a first optical network element, a first signal transmission transmitted according to a first set of transmission parameters over an optical communication channel established between the first optical network element and a second optical network element. The method includes determining a first quality of signal parameter associated with the first signal transmission and determining whether the first quality of signal parameter is worse than a predetermined quality of signal value. Upon determining that the first quality of signal parameter is not worse than the predetermined value, the method further includes transmitting a second set of transmission parameters to the second optical network element to further optimize the bandwidth of the optical communication channel.

公开(公告)号：US20160211643A1

公开(公告)日：2016-07-21

申请号：US14601570

申请日：2015-01-21

Applicant: Cisco Technology, Inc.

Inventor： Enrico Griseri ,  Mauro Brunella ,  Rosanna Pastorelli ,  Stefano Piciaccia

IPC: H01S3/13 ,  H04J14/02 ,  H04B10/079 ,  H01S3/30 ,  H01S3/131

CPC classification number: H01S3/1301 ,  H01S3/094096 ,  H01S3/10069 ,  H01S3/1305 ,  H01S3/302 ,  H01S2301/04 ,  H04B10/0797 ,  H04B10/2916 ,  H04B10/293 ,  H04J14/0221

Abstract: An optical fiber carries optical channels injected into the optical fiber to a Raman amplifier. A controller determines a static tilt associated with the channels in the fiber due to wavelength dependent losses. A photodiode measures a total power of the channels at an output of the Raman amplifier. The controller determines a dynamic tilt associated with channels in the fiber based in part on the measured total power. The dynamic tilt is induced by Stimulated Raman Scattering (SRS) in the fiber and varies as a function of a total power of the signals injected into the fiber. The controller determines a total tilt with which to offset the static and dynamic tilts. The controller sets an amplifier gain tilt applied to the channels equal to the total tilt.

Abstract translation: 光纤将注入光纤的光通道传送到拉曼放大器。 由于波长相关的损失，控制器确定与光纤中的通道相关联的静态倾斜。 光电二极管测量拉曼放大器输出端的通道总功率。 部分地基于测量的总功率，控制器确定与光纤中的信道相关联的动态倾斜。 动态倾斜由纤维中的受激拉曼散射（SRS）引起，并且随着注入光纤的信号的总功率的变化而变化。 控制器确定用于抵消静态和动态倾斜的总倾斜度。 控制器设置施加到等于总倾斜的通道的放大器增益倾斜。

公开(公告)号：US10863255B2

公开(公告)日：2020-12-08

申请号：US16386309

申请日：2019-04-17

Applicant: Cisco Technology, Inc.

Inventor： Randy Zhang ,  Gabriele Maria Galimberti ,  Stefano Piciaccia ,  Mauro Brunella

IPC: H04Q11/00 ,  H04L12/703 ,  H04L12/707

Abstract: A method for optical restoration in an optical network is provided. A network controller obtains, from one or more optical nodes of an optical network, at least one failure notification indicating a failure of a primary path between a first node and a second node. The network controller forwards to a first set of optical nodes, data-plane parameters for optical components of the first set of optical nodes. The first set of optical nodes include the first node, the second node, and one or more intermediate nodes, and forms a restoration path for the primary path. The data-plane parameters for the optical components are forwarded in parallel to the first set of optical nodes of the restoration path so as to activate the restoration path in parallel. The network controller switches traffic from the primary path to the restoration path.

公开(公告)号：US20190379480A1

公开(公告)日：2019-12-12

申请号：US16449618

申请日：2019-06-24

Applicant: Cisco Technology, Inc.

Inventor： Alberto Arnaldo Tanzi ,  Stefano Piciaccia ,  Maurizio Gazzola ,  Lorenzo Ghioni

IPC: H04J14/02 ,  H04Q11/00 ,  H04B10/079

Abstract: A network controller controls optical nodes configured to communicate with each other at multiple line rates using different tuples of [bits/symbol, symbol rate] for each line rate. The network controller determines multiple paths between two optical nodes, selects a desired line rate at which to communicate between the two optical nodes, and accesses a path database that indicates an available optical bandwidth and an available optical signal-to-noise ratio (SNR) along each path. The network controller determines feasible paths among the paths. To do this, the network controller, for each path, searches the different tuples of the desired line rate for a tuple for which a desired optical bandwidth and a desired optical SNR are accommodated by the available optical bandwidth and the available optical SNR of the path, respectively. The network controller programs optical nodes of one of the feasible paths with a tuple found in the searching.

公开(公告)号：US09749042B2

公开(公告)日：2017-08-29

申请号：US14337919

申请日：2014-07-22

Applicant: Cisco Technology, Inc.

Inventor： Rosanna Pastorelli ,  Stefano Piciaccia ,  Alberto Tanzi ,  Eliana Silvia Vercelli

IPC: H04B10/08 ,  H04B17/00 ,  H04B10/079 ,  H04Q11/00 ,  H04J14/02

CPC classification number: H04B10/0795 ,  H04B10/0793 ,  H04J14/0227 ,  H04J14/0257 ,  H04J14/0258 ,  H04J14/0267 ,  H04J14/0269 ,  H04J14/0271 ,  H04Q11/0062 ,  H04Q2011/0073 ,  H04Q2011/0086

Abstract: In an optical communication network that includes a plurality of interconnected network nodes, a method includes storing in each network node, and for each communication channel that traverses the node, one or more impairment margins of respective impairments that affect the communication channel. A potential communication channel that traverses a subset of the nodes in the network is identified. A quality of the potential communication channel is evaluated by processing the impairment margins stored in the nodes in the subset.

公开(公告)号：US09083458B2

公开(公告)日：2015-07-14

申请号：US13937613

申请日：2013-07-09

Applicant: Cisco Technology, Inc.

Inventor： Stefano Piciaccia ,  Rosanna Pastorelli ,  Mauro Brunella

IPC: H04B17/00 ,  H04B10/079

CPC classification number: H04B10/0793 ,  H04B10/0797 ,  H04B10/2935

Abstract: Techniques are presented for automatic tuning of operating parameters, e.g., amplifier gain, in an optical network. A section of an optical network comprises a plurality of spans between optical nodes, and each optical node has an amplifier to amplify optical signals for transmission between optical nodes. Physical network layer data is obtained from the optical nodes for use as input to an analytical model. A set of powers defining an optimum working point of the amplifiers is computed based on variations in amplifier noise figure which depend on amplifier gain. A figure of merit representative of network section performance is computed based on linear and non-linear noise at current power levels of the amplifiers. The figure of merit is evaluated. The set of powers is applied to the amplifiers in the network section when evaluation of the figure of merit indicates that network performance improvement can be achieved.

Abstract translation: 提出了用于在光网络中自动调整操作参数（例如，放大器增益）的技术。 光网络的一部分包括光节点之间的多个跨距，并且每个光节点具有放大器以放大用于在光节点之间传输的光信号。 物理网络层数据从光学节点获得，用作分析模型的输入。 基于取决于放大器增益的放大器噪声系数的变化来计算定义放大器的最佳工作点的一组功率。 基于放大器的当前功率电平的线性和非线性噪声来计算代表网络部分性能的品质因数。 评价品质因数。 当评估品质因数表示可以实现网络性能改善时，该功率集合被应用于网络部分中的放大器。

公开(公告)号：US11483635B2

公开(公告)日：2022-10-25

申请号：US17202984

申请日：2021-03-16

Applicant: Cisco Technology, Inc.

Inventor： Gilberto Loprieno ,  Luca Della Chiesa ,  Stefano Binetti ,  Stefano Piciaccia ,  Giovanni Osnago

IPC: H04Q11/00 ,  H04B10/079 ,  H04B10/071 ,  H04L7/00

Abstract: A method of obtaining a measure of asymmetry between optical fibers of a forward and reverse paths is provided in order to synchronize clocks of optical nodes connected by asymmetrical optical fiber paths. The method includes receiving, at first and second arrival times, from a first optical network device, a first optical signal transmitted on a first optical fiber and a second optical signal transmitted on a second optical fiber, calculating a first time difference between the second arrival time and the first arrival time. The method includes determining a measure of asymmetry between the first optical fiber and the second optical fiber based on the first time difference and a second time difference between a first time of transmission by the first optical network device of the first optical signal and a second time of transmission by the first optical network device of the second optical signal.

公开(公告)号：US10986426B1

公开(公告)日：2021-04-20

申请号：US16732836

申请日：2020-01-02

Applicant: Cisco Technology, Inc.

Inventor： Gilberto Loprieno ,  Luca Della Chiesa ,  Stefano Binetti ,  Stefano Piciaccia ,  Giovanni Osnago

IPC: H04Q11/00 ,  H04B10/079 ,  H04B10/071 ,  H04L7/00

Abstract: A method of obtaining a measure of asymmetry between optical fibers of a forward and reverse paths is provided in order to synchronize clocks of optical nodes connected by asymmetrical optical fiber paths. The method includes receiving, at first and second arrival times, from a first optical network device, a first optical signal transmitted on a first optical fiber and a second optical signal transmitted on a second optical fiber, calculating a first time difference between the second arrival time and the first arrival time. The method includes determining a measure of asymmetry between the first optical fiber and the second optical fiber based on the first time difference and a second time difference between a first time of transmission by the first optical network device of the first optical signal and a second time of transmission by the first optical network device of the second optical signal.

公开(公告)号：US10397091B1

公开(公告)日：2019-08-27

申请号：US16132993

申请日：2018-09-17

Applicant: Cisco Technology, Inc.

Inventor： Luca Gumier ,  Stefano Piciaccia ,  Mauro Brunella

IPC: H04L12/751 ,  H04J14/02 ,  H04B10/079 ,  H04Q11/00 ,  H04B10/077

Abstract: At a first optical node of an optical communications system, during a signal initialization phase, a first optical pattern is received that includes a prefix indicating a beginning of a signal, a first word, and a first working signal for verifying stability of a connection between the first optical node and a second optical node of the optical communications system. A second optical pattern is transmitted that includes the prefix, a second word different from the first word, and the first working signal. A third optical pattern including the prefix, the first word, and a second working signal is received. Based on determining that a duration of the second working signal is greater than a duration of the first working signal plus a predetermined time, the first optical node determines that the second optical node is an adjacent node of the first optical node.