公开(公告)号：US07224909B2

公开(公告)日：2007-05-29

申请号：US10635561

申请日：2003-08-07

申请人： Derrick Remedios ,  Benjamin Wai Chan ,  Patrick Chilufya Chimfwembe ,  Ping Wai Wan

发明人： Derrick Remedios ,  Benjamin Wai Chan ,  Patrick Chilufya Chimfwembe ,  Ping Wai Wan

IPC分类号： H04B10/04

CPC分类号： H04B10/0775 ,  H04B2210/075

摘要： The invention provides a method and system for selectively canceling a specified frequency band in the payload of an optical communication system. This selected frequency band is to be used for launching pilot tones for power measurement and identification. The method controls the intensity of the optical payload signal through an intensity modulator that is included in the optical communication system. The frequency band in payload to be cancelled is removed where as the other frequency components of the payload are passed without attenuation. An embodiment that uses a feed-forward unit, a feedback unit and a control unit for generating a cancellation signal for the intensity modulator is described. An advantage of the method is that it removes a continuum of payload tones in the specified frequency band to be cancelled.

摘要翻译： 本发明提供一种用于选择性地取消光通信系统的有效载荷中的指定频带的方法和系统。 该选择的频段将用于启动用于功率测量和识别的导频音。 该方法通过包括在光通信系统中的强度调制器来控制光负载信号的强度。 去除有效载荷中要被取消的频带，其中有效负载的其他频率分量通过而不衰减。 描述了使用前馈单元，反馈单元和用于产生强度调制器的消除信号的控制单元的实施例。 该方法的一个优点是它去除了要被取消的指定频带中的有效负载音调的连续体。

公开(公告)号：US07139486B2

公开(公告)日：2006-11-21

申请号：US10635544

申请日：2003-08-07

申请人： Ping Wai Wan ,  Derrick Remedios ,  Dan Oprea ,  Patrick Chilufya Chimfwembe

发明人： Ping Wai Wan ,  Derrick Remedios ,  Dan Oprea ,  Patrick Chilufya Chimfwembe

IPC分类号： H04J14/02

CPC分类号： H04B10/25073 ,  H04B2210/258 ,  H04J14/0201 ,  H04J14/0221

摘要： An optical add/drop multiplexing (OADM) apparatus and method are disclosed for detecting pilot tones, removing ghost tones, and re-inserting pilot tones on WDM signals in an optical network. The OADM apparatus comprises a smart processing and control unit (PCU) for detecting pilot tones used for channel identifications, including identifying and removing ghost tones associated with respective optical channels, and re-inserting the processed pilot tones into the respective optical channels. The OADM apparatus and method may incorporate digital PCU or analog PCU for processing pilot tones and removing ghost tones.

摘要翻译： 公开了一种用于检测导频音调，去除重影音调以及在光网络中的WDM信号上重新插入导频音调的光分插复用（OADM）装置和方法。 OADM装置包括用于检测用于信道标识的导频音调的智能处理和控制单元（PCU），包括识别和去除与相应的光信道相关联的重音，并将处理的导频音重新插入相应的光信道。 OADM装置和方法可以包括用于处理导频音和去除重音的数字PCU或模拟PCU。

公开(公告)号：US07127165B2

公开(公告)日：2006-10-24

申请号：US10628418

申请日：2003-07-29

申请人： Paul David Obeda ,  Robert Michael Bierman ,  James Benson Bacque ,  Colin Geoffrey Kelly ,  Derrick Remedios ,  Ping Wai Wan

发明人： Paul David Obeda ,  Robert Michael Bierman ,  James Benson Bacque ,  Colin Geoffrey Kelly ,  Derrick Remedios ,  Ping Wai Wan

IPC分类号： H04B10/08

CPC分类号： H04B10/079 ,  H04B10/07955 ,  H04B2210/075

摘要： A method and system for compensating for side effects of cross gain modulation in amplified optical networks, which allows reliable identification of expected and unexpected channels in the network is provided. Each optical channel traveling in the optical network is marked with a unique channel signature (expected channel signature), having one or more dither tone modulated onto the optical channel; followed by detecting a spectrum of tones, including said modulated dither tones and ghost tones thereof produced by the cross gain modulation in the optical network, at various locations in the optical network. Amplitudes of the spectrum tones, which belong to the expected channel signature, are compared with a first threshold, while amplitudes of the remaining spectrum tones, which are not the valid tones, are compared with a second threshold, which is lower than the first threshold. The spectrum tones are identified as valid tones if their amplitudes are above the first threshold; and an alarm signaling that the expected channel signature is missing is generated if the amplitude of the spectrum tone is below the first threshold. Yet another alarm is generated signaling that an unexpected channel is detected in the network if the amplitude of at least one of the remaining spectrum tones is exceeding the second threshold. Alternatively, the other alarm is generated if amplitudes of the remaining spectrum tones belonging to one of the allowable channel signatures in the network are above the second threshold. A corresponding system incorporating the step of the methods described above is also provided.

摘要翻译： 提供了一种用于补偿放大光网络中交叉增益调制的副作用的方法和系统，其允许可靠地识别网络中的预期和意外信道。 在光网络中行进的每个光信道被标记为具有调制到光信道上的一个或多个抖动音调的唯一信道签名（预期信道签名）; 随后在光网络中的各个位置处检测包括由光网络中的交叉增益调制产生的所述调制抖动音和其重音的音调。 将属于预期信道签名的频谱音调的幅度与第一阈值进行比较，而不是有效音调的剩余频谱音调的幅度与低于第一阈值的第二阈值进行比较 。 如果它们的幅度高于第一阈值，则频谱色调被识别为有效音调; 并且如果频谱色调的幅度低于第一阈值，则产生警告，指示预期信道签名丢失。 如果剩余频谱色调中的至少一个的幅度超过第二阈值，则产生另一报警，指示在网络中检测到意外信道。 或者，如果属于网络中的一个可允许频道签名的剩余频谱的幅度高于第二阈值，则产生另一警报。 还提供了包括上述方法的步骤的相应系统。

公开(公告)号：US07068932B2

公开(公告)日：2006-06-27

申请号：US10260621

申请日：2002-10-01

申请人： Ping Wai Wan ,  Derrick Remedios ,  Eddie Kai Ho Ng

发明人： Ping Wai Wan ,  Derrick Remedios ,  Eddie Kai Ho Ng

IPC分类号： H04B10/08 ,  H04B17/00

CPC分类号： H04B10/2942 ,  H04B10/2935

摘要： A method for automatic initialization of an optical network is provided. A network management system (NMS) performs remote determination of span losses and sets the operating points of network components. The initialization method comprises remotely and automatically setting target gains of optical amplifiers and signal power levels at transmitters and receivers to required operating values. The methods for initialization of the optical network of the embodiments include gain excursion minimization (GEM) for individual channels passing through amplifiers and/or pre-emphasis of the optical link, where channel powers at the transmitters are biased to compensate for the effects of optical amplifiers gain ripple.

摘要翻译： 提供了一种用于光网络的自动初始化的方法。 网络管理系统（NMS）执行远程确定跨度损耗并设置网络组件的工作点。 初始化方法包括将发射机和接收机的光放大器的目标增益和信号功率电平远程并自动设置为所需的操作值。 实施例的光网络的初始化方法包括通过放大器的各个信道的增益偏移最小化（GEM）和/或光链路的预加重，其中在发射机处的信道功率被偏置以补偿光学效应 放大器增益波动。

公开(公告)号：US20060023737A1

公开(公告)日：2006-02-02

申请号：US11178330

申请日：2005-07-12

申请人： Eddie Ng ,  Jason De Rocher ,  Derrick Remedios ,  James Bacque ,  Ping Wan

发明人： Eddie Ng ,  Jason De Rocher ,  Derrick Remedios ,  James Bacque ,  Ping Wan

IPC分类号： H04L12/43

CPC分类号： H04B10/075 ,  H04B10/0775 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/0283

摘要： This invention provides a method for commissioning an optical network using internal Automatic Spontaneous Emission (ASE) light inherently present in the optical network as a light source (the ASE light source) for measuring losses inside and between nodes in the network. A modular segmented approach is adopted and the network is commissioned segment by segment. The method uses techniques for the correction of the Optical Signal to Noise Ratio induced error as well as the Spectral Filtering Error during the loss computation required for adjusting the gains of the amplifiers at each network node to an appropriate value. Since the method does not require an external laser source that needs to be moved manually from node to node, it greatly reduces the commissioning time. Since it uses only the existing components of the network nodes it also leads to a significant saving in cost.

摘要翻译： 本发明提供一种使用光网络中固有存在的内部自发自发发射（ASE）光作为用于测量网络内部和节点之间的损耗的光源（ASE光源）来调试光网络的方法。 采用模块化分段方式，逐段调试网络。 该方法使用用于校正光信噪比诱导误差的技术以及在将每个网络节点处的放大器的增益调整到适当值所需的损耗计算期间的光谱滤波误差。 由于该方法不需要需要从节点手动移动的外部激光源，因此大大减少了调试时间。 由于它仅使用网络节点的现有组件，因此也可大大节省成本。

公开(公告)号：US06597161B2

公开(公告)日：2003-07-22

申请号：US09991683

申请日：2001-11-26

申请人： Dongxing Jin ,  Ping Wai Wan ,  Derrick Remedios ,  Patrick Chilufya Chimfwembe

发明人： Dongxing Jin ,  Ping Wai Wan ,  Derrick Remedios ,  Patrick Chilufya Chimfwembe

IPC分类号： G01R2300

CPC分类号： G01R23/16

摘要： Provided is a signal detector and method for spectrum analysis and for measuring power of one or more channels of an electrical or optical signal. Each channel may carry a unique modulation tone. A DSP (digital-signal processor) performs DFTs (discrete Fourier transforms) on the signal. Frequency bands of interest which contain a tone that requires detection are processed. Higher layers of coherent integrations are performed on bands which have not detected a tone with a resolution that is suitable for power measurement. The higher layers of coherent integrations are performed by collecting additional data and performing a coherent integration. Further higher layer coherent integrations are performed until all modulation tones have been detected with a suitable resolution or up to a maximum detection latency.

摘要翻译： 提供了用于频谱分析和用于测量电信号或光信号的一个或多个信道的功率的信号检测器和方法。 每个通道可以携带唯一的调制音。 DSP（数字信号处理器）对信号执行DFT（离散付里叶变换）。 处理包含需要检测的色调的感兴趣的频段。 在没有检测到具有适合于功率测量的分辨率的音调的频带上执行更高层的相干积分。 通过收集附加数据并执行相干整合来执行较高层的相干整合。 执行进一步的更高层相干积分，直到已经以适当的分辨率或达到最大检测等待时间检测到所有调制音调为止。