公开(公告)号：US06766113B1

公开(公告)日：2004-07-20

申请号：US09596378

申请日：2000-06-16

申请人： Daniel Y. Al-Salameh ,  Mario F. Alvarez ,  David S. Levy ,  Jithamithra Sarathy ,  Anastasios Tzathas

发明人： Daniel Y. Al-Salameh ,  Mario F. Alvarez ,  David S. Levy ,  Jithamithra Sarathy ,  Anastasios Tzathas

IPC分类号： H04B1008

CPC分类号： H04J14/0291 ,  H04J14/0227 ,  H04J14/0245 ,  H04J14/0249 ,  H04J14/0283 ,  H04Q11/0062 ,  H04Q2011/0069 ,  H04Q2011/0081 ,  H04Q2011/0092

摘要： A facility is provided to allow a supervisory message to quickly propagate through a transmission network without delay. Specifically, a supervisory message is quickly routed from one node to a next node by (a) splitting the control channel signal carrying the supervisory message at a receiving node, (b) sending one of the split control channel signals to an output via switchable apparatus for immediate transmission the next node and (c) sending the other split signal to a controller for analysis. If the controller invokes a predetermined procedure as a result of the content of the message, e.g., invokes protection switching, then the controller forms a supervisory message identifying the invoked procedure, operates the switchable apparatus so that the message identifying the invoked procedure may be routed to the output in place of the split channel signal message.

摘要翻译： 提供了一种设施，允许监控消息通过传输网络快速传播，而不会延迟。 具体地说，通过（a）在接收节点分割携带有监督消息的控制信道信号，将一个监控消息快速路由到一个节点，（b）通过可切换设备将一个分离控制信道信号发送到一个输出端 用于立即传输下一个节点，（c）将另一个分离信号发送到控制器进行分析。 如果控制器作为消息的内容调用预定的过程，例如调用保护切换，则控制器形成标识被调用过程的监控消息，操作可切换设备，使得可以路由识别被调用过程的消息 到输出代替分离信道信号消息。

公开(公告)号：US06721502B1

公开(公告)日：2004-04-13

申请号：US09675733

申请日：2000-09-30

申请人： Daniel Y. Al-Salameh ,  Donald L. Husa ,  David S. Levy ,  Timothy O. Murphy ,  Gaylord W. Richards

发明人： Daniel Y. Al-Salameh ,  Donald L. Husa ,  David S. Levy ,  Timothy O. Murphy ,  Gaylord W. Richards

IPC分类号： G02F100

CPC分类号： H04J14/0227 ,  H04J14/0241 ,  H04J14/0283 ,  H04J14/0294 ,  H04J14/0295

摘要： An optical transmission system formed from a plurality of nodes interconnected in a ring configuration via at least two transmission media provides protection capacity for each optical channel. If a channel signal does not meet predetermined criteria, then a loss of signal indication is declared for the channel and one of a plurality of protection switching states is invoked to re-route service traffic carried by the impaired channel to its destination via corresponding protection capacity. The switching states include particular transmission states and at least “keep-alive” and “protection access” states.

摘要翻译： 由通过至少两个传输介质以环形配置互连的多个节点形成的光传输系统为每个光信道提供保护容量。 如果信道信号不符合预定标准，则声明信道丢失信号，并且调用多个保护倒换状态中的一个保护切换状态，以通过相应的保护容量将受损信道携带的业务业务重新路由到其目的地 。 切换状态包括特定的传输状态和至少“保持活动”和“保护访问”状态。

公开(公告)号：US07409121B2

公开(公告)日：2008-08-05

申请号：US11565338

申请日：2006-11-30

申请人： Christopher Richard Doerr ,  David S. Levy

发明人： Christopher Richard Doerr ,  David S. Levy

IPC分类号： G02B6/12 ,  G02B6/26

CPC分类号： G02B6/12021 ,  H04J14/0204 ,  H04J14/0206 ,  H04J14/0208 ,  H04J14/0209 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0219 ,  H04J14/0221

摘要： A proposed integrateable optical interleaver includes an input Y-branch coupler and at least two multi-section optical couplers. The multi-section optical couplers of the interleaver include at least three substantially similar optical couplers, adjacent ones of the optical couplers interconnected via at least one set of waveguides. The interleaver of the present invention comprises a highly compact and fabrication-robust form that is capable of being integrated onto a single planar lightwave circuit.

摘要翻译： 所提出的可组合光交错器包括输入Y分支耦合器和至少两个多段光耦合器。 交织器的多段光耦合器包括至少三个基本相似的光耦合器，通过至少一组波导互连的相邻光耦合器中的相邻光耦合器。 本发明的交织器包括能够集成到单个平面光波电路上的高度紧凑且制造稳健的形式。

公开(公告)号：US07099582B2

公开(公告)日：2006-08-29

申请号：US10160596

申请日：2002-05-31

申请人： Chedley Belhadj-Yahya ,  David S. Levy

发明人： Chedley Belhadj-Yahya ,  David S. Levy

IPC分类号： H04B10/08

CPC分类号： H04J14/02 ,  H04B10/07953

摘要： A method and apparatus for optical performance monitoring that provides for multi-rate and multi-protocol monitoring includes, identifying a protocol associated with each of a plurality of communication signals using respective data rates extracted therefrom, determining, for each of the plurality of communication signals, a respective bit-error rate (BER), and generating an alarm indicative of BER excursions beyond a protocol appropriate BER threshold level.

摘要翻译： 一种用于提供多速率和多协议监测的光学性能监测的方法和装置包括：使用从其提取的相应数据速率来识别与多个通信信号中的每一个相关联的协议，为每个多个通信信号 ，相应的比特误码率（BER），并且产生指示超出协议适当BER阈值水平的BER偏移的报警。

公开(公告)号：US07362979B2

公开(公告)日：2008-04-22

申请号：US10355583

申请日：2003-01-31

申请人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

发明人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

IPC分类号： H04B10/12 ,  H04B10/04

CPC分类号： H04B10/508 ,  H04B10/505

摘要： An apparatus and method are provided for transmitting an optical duobinary signal using a low bandwidth modulator having a bandwidth of less than about 60% of the transmission bit rate of the transmitter. The modulator is adapted to provide low pass filtering for low pass filtered duobinary transmission in an optical fiber transmission system having residual dispersion.

摘要翻译： 提供一种装置和方法，用于使用具有小于发射机的传输比特率的约60％的带宽的低带宽调制器来发送光学双二进制信号。 调制器适于在具有残余色散的光纤传输系统中为低通滤波的双二进制传输提供低通滤波。

公开(公告)号：US08305881B2

公开(公告)日：2012-11-06

申请号：US10919618

申请日：2004-08-17

申请人： Robert S. Harby ,  David S. Levy ,  Dat D. Ngo ,  James Dorian Sandoz ,  Charles Small

发明人： Robert S. Harby ,  David S. Levy ,  Dat D. Ngo ,  James Dorian Sandoz ,  Charles Small

IPC分类号： H04B10/17 ,  H04B10/08 ,  H04B10/12 ,  H04J14/02

CPC分类号： H04J14/0227 ,  H04J3/085 ,  H04J3/14 ,  H04J14/0226 ,  H04J14/0241 ,  H04J14/0246 ,  H04J14/0247 ,  H04J14/0283 ,  H04J14/0295

摘要： A method and system for maximizing wavelength reuse in an optically protected wavelength-division-multiplexed (WDM) network, the WDM network supporting a plurality of service connections, includes associating service connections supported by non-overlapping paths to form respective service channel groups, and for each service channel group, assigning at least one common wavelength channel for establishing the service connections. In addition, for each of said groups, at least one common wavelength channel is assigned for establishing a shared protection path for the service connections of each of said groups. In addition, the wavelength channels assigned for establishing the shared protection paths for each of the groups may be used for providing service connections for the WDM network when not in use as shared protection paths. However such provisional service connections are dropped when the wavelength channels are needed to establish shared protection paths. Such provisional service connections may be offered at reduced cost.

摘要翻译： 一种用于在光保护的波分复用（WDM）网络中支持多个服务连接的WDM网络中最大化波长重用的方法和系统包括：将由非重叠路径支持的服务连接相关联以形成相应的服务信道组，以及 对于每个服务信道组，分配用于建立服务连接的至少一个公共波长信道。 此外，对于每个所述组，分配至少一个公共波长信道以建立用于每个所述组的服务连接的共享保护路径。 此外，分配用于为每个组建立共享保护路径的波长信道可用于在不用作共享保护路径时为WDM网络提供服务连接。 然而，当需要波长信道来建立共享保护路径时，这种临时业务连接被丢弃。 这样的临时服务连接可以以降低的成本提供。

公开(公告)号：US07155123B2

公开(公告)日：2006-12-26

申请号：US10142475

申请日：2002-05-10

申请人： David S. Levy ,  Peter H. Mitev

发明人： David S. Levy ,  Peter H. Mitev

IPC分类号： H04B10/08

CPC分类号： H04B10/07 ,  H04B10/0791 ,  H04B10/0793 ,  H04B10/07953

摘要： Method and apparatus for fault localization in an optical network using time trend correlation of end node performance parameters and intermediate node performance parameters, such as QoS and quasi-Q factors, respectively. The method and apparatus are bit-rate and protocol independent, enabling testing for each channel of a diverse dense wavelength division multiplexed traffic system using a single set of hardware.

公开(公告)号：US06792172B1

公开(公告)日：2004-09-14

申请号：US09674821

申请日：2001-04-20

申请人： David S. Levy ,  Robert Scarmozzino ,  Richard M. Osgood, Jr.

发明人： David S. Levy ,  Robert Scarmozzino ,  Richard M. Osgood, Jr.

IPC分类号： G02B626

CPC分类号： G02B6/2813

摘要： The Multimode Interference coupler according to the invention has smoothly continuous inwardly tapered sidewalls (301) which define the width of the multimode region (W1) along the propagation axis of the device. The inward taper causes the average width of the device to be reduced in comparison to known couplers having straight sidewalls (202). Further, invention allows the access waveguides (303, 309) to remain sufficiently spaced, while reducing the overall length of the device, to avoid lithographic gap fill-in and unwanted optical coupling between the waveguides.

摘要翻译： 根据本发明的多模干涉耦合器具有沿着装置的传播轴限定多模区域（W1）的宽度的平滑连续向内渐缩的侧壁（301）。 与已知具有直的侧壁（202）的联接器相比，向内的锥形导致装置的平均宽度减小。 此外，本发明允许接入波导（303,309）保持足够的间隔，同时减少器件的总长度，以避免波导之间的光刻间隙填充和不期望的光耦合。

公开(公告)号：US07362980B2

公开(公告)日：2008-04-22

申请号：US10356203

申请日：2003-01-31

申请人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

发明人： Douglas M. Gill ,  David S. Levy ,  Xiang Liu ,  Moncef B. Tayahi ,  Xing Wei

IPC分类号： H04B10/12 ,  H04B10/04

CPC分类号： H04B10/508 ,  H04B10/505

摘要： An optical duobinary transmission system and method are provided for transmitting optical duobinary signals across an optical transmission link having residual dispersion. The system includes a transmitter having a low bandwidth modulator, adapted to provide filtering for low pass filtered duobinary transmission. The transmission link is designed such that the residual dispersion of the transmission link substantially compensates for signal distortion from the transmitter.

摘要翻译： 提供了一种用于在具有残余色散的光传输链路上传输光双二进制信号的光双二进制传输系统和方法。 该系统包括具有低带宽调制器的发射机，适于对低通滤波的双二进制传输提供滤波。 传输链路被设计成使得传输链路的残余色散基本上补偿来自发射机的信号失真。

公开(公告)号：US07171116B2

公开(公告)日：2007-01-30

申请号：US10245029

申请日：2002-09-17

申请人： Steven K. Korotky ,  David S. Levy

发明人： Steven K. Korotky ,  David S. Levy

IPC分类号： H04B10/00

CPC分类号： H04J14/0294 ,  H04B10/505 ,  H04B10/5053 ,  H04J14/0283 ,  H04J14/0284

摘要： A dual-output Mach-Zehnder modulator (MZM2) and configurations of optical transmitters based on the MZM2 which obviate the optical splitter that is typically used to provide keep-alive functionality in redundantly-connected, protected optical networks, SONET add-drop multiplexers, and optical IP routers. The configurations provide equivalent keep-alive utility at a reduced system cost relative to the prior art. The configurations also support enhanced Operations, Administration, Maintenance, and Provisioning (OAM&P) functionality at little to no additional cost relative to the prior art. Instead of being a direct copy of the service signal, the keep-alive of this configuration is an inverted version of the service signal. This inverted version of the service signal is supported at a client by utilization of means for detecting and righting the inverted signal. The inverted state of the signal on the protection path can be used as an inband indicator to notify the client in the event of a failure on the service path. This inband indicator requires little or no additional circuitry to accommodate. Another aspect of this invention allows the provisionable substitution of the inverted signal with a preemptive signal to support low-priority traffic when there is no fault on the service path S.

摘要翻译： 双输出马赫 - 曾德尔调制器（MZM2）以及基于MZM2的光发射机的配置，可消除通常用于在冗余连接的保护光网络中提供保持功能的光分路器，SONET分插复用器， 和光IP路由器。 这些配置相对于现有技术以降低的系统成本提供等效的保活实用程序。 这些配置还支持增强的操作，管理，维护和配置（OAM＆P）功能，相对于现有技术几乎没有额外的成本。 代替服务信号的直接副本，这种配置的保持是服务信号的反转版本。 通过利用用于检测和校正反相信号的装置，在客户端支持服务信号的这种反向版本。 保护路径上的信号的反转状态可以用作带内指示器，以在服务路径发生故障的情况下通知客户端。 该带内指示器需要很少的或不需要额外的电路来容纳。 本发明的另一方面允许在服务路径S上没有故障的情况下，使用抢占信号来替换反向信号以支持低优先级业务。