公开(公告)号：US09917412B1

公开(公告)日：2018-03-13

申请号：US15343785

申请日：2016-11-04

Applicant: Cisco Technology, Inc.

Inventor： Stefano Piciaccia ,  Lorenzo Ghioni ,  Walid Wakim

IPC: H01S3/30 ,  H01S3/106 ,  H01S3/094 ,  H01S3/067 ,  H01S3/16

CPC classification number: H01S3/1065 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/06762 ,  H01S3/06766 ,  H01S3/094003 ,  H01S3/1608 ,  H01S2301/02

Abstract: An optical amplifier may comprise a first gain stage and a second gain stage. Each of the first and second gain stages may comprise a laser pump and an active fiber. A liquid crystal device may be coupled between an output of the first gain stage and an input of the second gain stage. A control unit may be coupled to the first and second gain stages, liquid crystal device and configured to control the first and second gain stages, and the liquid crystal device to provide a switchable gain. Light may pass through the first and second gain stages and be amplified by the first and second gain stages. The light amplified by the first gain stage may pass through the liquid crystal device and may be filtered by the liquid crystal device.

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：US20150016819A1

公开(公告)日：2015-01-15

申请号：US13937613

申请日：2013-07-09

Applicant: Cisco Technology, Inc.

Inventor： Stefano Piciaccia ,  Rosanna Pastorelli ,  Mauro Brunella

IPC: 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。 评估品质因数。 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：US08923699B2

公开(公告)日：2014-12-30

申请号：US14445477

申请日：2014-07-29

Applicant: Cisco Technology, Inc.

Inventor： Ornan Gerstel ,  Mauro Macchi ,  Stefano Piciaccia

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

CPC classification number: H04Q11/0005 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0216 ,  H04J14/0217 ,  H04J14/0219 ,  H04J14/0283 ,  H04J14/0284 ,  H04J14/0286 ,  H04J14/0294 ,  H04J14/0295 ,  H04Q2011/0015 ,  H04Q2011/0016 ,  H04Q2011/0024 ,  H04Q2011/0052 ,  H04Q2011/0081 ,  H04Q2011/0092

Abstract: Switching architectures for WDM mesh and ring network nodes are presented. In mesh networks, the switching architectures have multiple levels—a network level having wavelength routers for add, drop and pass-through functions, an intermediate level having device units which handle add and drop signals, and a local level having port units for receiving signals dropped from the network and transmitting signals to be added to the network. The intermediate level device units are selected and arranged for performance and cost considerations. The multilevel architecture also permits the design of reconfigurable optical add/drop multiplexers for ring network nodes, the easy expansion of ring networks into mesh networks, and the accommodation of protection mechanisms in ring networks.

Abstract translation: 介绍了WDM网格和环网节点的交换架构。 在网状网络中，交换架构具有多个级别 - 具有用于添加，丢弃和传递功能的波长路由器的网络级别，具有处理添加和丢弃信号的设备单元的中间级别以及具有用于接收信号的端口单元的本地级 从网络中丢弃并发送要添加到网络的信号。 为了性能和成本考虑，选择和布置中级设备单元。 多层架构还允许为环网节点设计可重配置的光分插复用器，将网络轻松扩展到网状网络中，以及环网中保护机制的适应性。