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.

公开(公告)号：US09577403B2

公开(公告)日：2017-02-21

申请号：US15044730

申请日：2016-02-16

Applicant: Cisco Technology, Inc.

Inventor： Enrico Griseri ,  Enrico Self ,  Mauro Brunella

IPC: H01S3/067 ,  H01S3/30 ,  H04B10/29 ,  H04B10/07 ,  H04J14/02 ,  H04B10/291 ,  H04B10/293 ,  H01S3/094 ,  H04B10/079 ,  H01S3/10

CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094096 ,  H01S3/10069 ,  H01S2301/02 ,  H04B10/07955 ,  H04B10/2916 ,  H04B10/2933 ,  H04J14/0221

Abstract: Techniques are presented herein to set power levels for multiple Raman pump wavelengths in a distributed Raman amplification configuration. A first receive power measurement is obtained at a second node with a controlled optical source at a first node turned on and with a plurality of Raman pump lasers at different wavelengths at the second node turned off. A second receive power measurement is obtained at the second node with the controlled optical source at the first node turned on and the plurality of Raman pump lasers turned on to respective reference power levels to inject optical Raman pump power at a corresponding plurality of wavelengths into the optical fiber span. Based on a target Raman gain and a target Raman gain tilt, respective ratios of a total power are obtained, each ratio to be used for a corresponding one of the plurality of Raman pump lasers.

Abstract translation: 本文提出了技术来设置分布式拉曼放大配置中多个拉曼泵浦波长的功率水平。 第一接收功率测量在第二节点处获得，其中第一节点处于受控光源并且第二节点处的多个拉曼泵浦激光器处于不同波长处。 在第二节点处获得第二接收功率测量，其中第一节点处的受控光源被接通，并且多个拉曼泵激光器接通到相应的参考功率电平，以将相应多个波长的光拉曼泵功率注入到 光纤跨度 基于目标拉曼增益和目标拉曼增益倾斜，获得总功率的各自的比率，用于多个拉曼泵浦激光器中的相应一个的每个比率。

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：US09300110B2

公开(公告)日：2016-03-29

申请号：US14037794

申请日：2013-09-26

Applicant: Cisco Technology, Inc.

Inventor： Enrico Griseri ,  Enrico Self ,  Mauro Brunella

IPC: H04B10/29 ,  H01S3/30 ,  H04B10/291 ,  H04B10/293 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10

CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094096 ,  H01S3/10069 ,  H01S2301/02 ,  H04B10/07955 ,  H04B10/2916 ,  H04B10/2933 ,  H04J14/0221

Abstract: Techniques are presented herein to set power levels for multiple Raman pump wavelengths in a distributed Raman amplification configuration. A first receive power measurement is obtained at a second node with a controlled optical source at a first node turned on and with a plurality of Raman pump lasers at different wavelengths at the second node turned off. A second receive power measurement is obtained at the second node with the controlled optical source at the first node turned on and the plurality of Raman pump lasers turned on to respective reference power levels to inject optical Raman pump power at a corresponding plurality of wavelengths into the optical fiber span. Based on a target Raman gain and a target Raman gain tilt, respective ratios of a total power are obtained, each ratio to be used for a corresponding one of the plurality of Raman pump lasers.

Abstract translation: 本文提出了技术来设置分布式拉曼放大配置中多个拉曼泵浦波长的功率水平。 第一接收功率测量在第二节点处获得，其中第一节点处于受控光源并且第二节点处的多个拉曼泵浦激光器处于不同波长处。 在第二节点处获得第二接收功率测量，其中第一节点处的受控光源被接通，并且多个拉曼泵激光器接通到相应的参考功率电平，以将相应多个波长的光拉曼泵功率注入到 光纤跨度 基于目标拉曼增益和目标拉曼增益倾斜，获得总功率的各自的比率，用于多个拉曼泵浦激光器中的相应一个的每个比率。

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：US20160164248A1

公开(公告)日：2016-06-09

申请号：US15044730

申请日：2016-02-16

Applicant: Cisco Technology, Inc.

Inventor： Enrico Griseri ,  Enrico Self ,  Mauro Brunella

IPC: H01S3/30 ,  H04B10/079 ,  H04B10/291 ,  H04J14/02 ,  H01S3/067 ,  H01S3/094

CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094096 ,  H01S3/10069 ,  H01S2301/02 ,  H04B10/07955 ,  H04B10/2916 ,  H04B10/2933 ,  H04J14/0221

Abstract: Techniques are presented herein to set power levels for multiple Raman pump wavelengths in a distributed Raman amplification configuration. A first receive power measurement is obtained at a second node with a controlled optical source at a first node turned on and with a plurality of Raman pump lasers at different wavelengths at the second node turned off. A second receive power measurement is obtained at the second node with the controlled optical source at the first node turned on and the plurality of Raman pump lasers turned on to respective reference power levels to inject optical Raman pump power at a corresponding plurality of wavelengths into the optical fiber span. Based on a target Raman gain and a target Raman gain tilt, respective ratios of a total power are obtained, each ratio to be used for a corresponding one of the plurality of Raman pump lasers.

Abstract translation: 本文提出了技术来设置分布式拉曼放大配置中多个拉曼泵浦波长的功率水平。 第一接收功率测量在第二节点处获得，其中第一节点处于受控光源并且第二节点处的多个拉曼泵浦激光器处于不同波长处。 在第二节点处获得第二接收功率测量，其中第一节点处的受控光源被接通，并且多个拉曼泵激光器接通到相应的参考功率电平，以将相应多个波长的光拉曼泵功率注入到 光纤跨度 基于目标拉曼增益和目标拉曼增益倾斜，获得总功率的各自的比率，用于多个拉曼泵浦激光器中的相应一个的每个比率。

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：US20200336809A1

公开(公告)日：2020-10-22

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：US09455546B2

公开(公告)日：2016-09-27

申请号：US14601570

申请日：2015-01-21

Applicant: Cisco Technology, Inc.

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

IPC: H01S3/00 ,  H01S3/13 ,  H01S3/30 ,  H01S3/131 ,  H04B10/079 ,  H04J14/02

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：US20150085350A1

公开(公告)日：2015-03-26

申请号：US14037794

申请日：2013-09-26

Applicant: Cisco Technology, Inc.

Inventor： Enrico Griseri ,  Enrico Self ,  Mauro Brunella

IPC: H01S3/30

CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094096 ,  H01S3/10069 ,  H01S2301/02 ,  H04B10/07955 ,  H04B10/2916 ,  H04B10/2933 ,  H04J14/0221

Abstract: Techniques are presented herein to set power levels for multiple Raman pump wavelengths in a distributed Raman amplification configuration. A first receive power measurement is obtained at a second node with a controlled optical source at a first node turned on and with a plurality of Raman pump lasers at different wavelengths at the second node turned off. A second receive power measurement is obtained at the second node with the controlled optical source at the first node turned on and the plurality of Raman pump lasers turned on to respective reference power levels to inject optical Raman pump power at a corresponding plurality of wavelengths into the optical fiber span. Based on a target Raman gain and a target Raman gain tilt, respective ratios of a total power are obtained, each ratio to be used for a corresponding one of the plurality of Raman pump lasers.

Abstract translation: 本文提出了技术来设置分布式拉曼放大配置中多个拉曼泵浦波长的功率水平。 第一接收功率测量在第二节点处获得，其中第一节点处于受控光源并且第二节点处的多个拉曼泵浦激光器处于不同波长处。 在第二节点处获得第二接收功率测量，其中第一节点处的受控光源被接通，并且多个拉曼泵激光器接通到相应的参考功率电平，以将相应多个波长的光拉曼泵功率注入到 光纤跨度 基于目标拉曼增益和目标拉曼增益倾斜，获得总功率的各自的比率，用于多个拉曼泵浦激光器中的相应一个的每个比率。