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    Method and apparatus for computation reduction for tone detection
    1.
    发明授权
    Method and apparatus for computation reduction for tone detection 有权
    用于音调检测的计算减少的方法和装置

    公开(公告)号：US06732058B2

    公开(公告)日：2004-05-04

    申请号：US10134382

    申请日：2002-04-30

    申请人： Dongxing Jin ,  Ping Wan ,  Derrick Remedios ,  Leonard Marziliano

    发明人： Dongxing Jin ,  Ping Wan ,  Derrick Remedios ,  Leonard Marziliano

    IPC分类号： G06F1900

    CPC分类号： G06F17/142 ,  G06F17/141 ,  G06F17/147

    摘要： Various methods and apparatuses are provided for performing a radix-M FFT (Fast Fourier Transform) upon N time domain samples to produce N/S frequency domain samples for detecting tones of dithers impressed on channels of a WDM (wavelength Division Multiplexed) optical signal. Successive tones have a tone frequency spacing, &Dgr;fta, and a sampling frequency, fs, is chosen so that fs=N&Dgr;fta/S. S is a spacing given by S=Mw with w being an integer. The radix-M FFT is performed in k=logm(N) stages and within the stages a reduced number of radix-M computations, when compared to the number of radix-M computations of a conventional radix-M FFT, are performed on data points associated with the N time domain samples. This is possible because successive frequency domain samples of the N/S frequency domain samples differ by &Dgr;fta=S&Dgr;f where &Dgr;f is a frequency bandwidth.

    摘要翻译： 提供了各种方法和装置，用于在N个时域样本上执行基数M FFT（快速傅立叶变换），以产生N / S频域样本，用于检测印在WDM（波分复用）​​光信号的信道上的抖动的音调。 连续色调具有音频间隔Deltafta，并且选择采样频率fs，使得fs = NDeltafta / S。 S是由S = M 给出的间隔，其中w是整数。 在k = logm（N）个阶段中执行基数M FFT，并且在与数据的基数-M计算的数量相比较时，减少数量的基数M计算的阶段执行数据 与N个时域样本相关联的点。 这是可能的，因为N / S频域样本的连续频域样本随Deltafta = SDeltaf而不同，其中Deltaf是频带宽度。

    Channel identification in communications networks
    2.
    发明授权
    Channel identification in communications networks 有权
    通信网络中的信道识别

    公开(公告)号：US07158723B2

    公开(公告)日：2007-01-02

    申请号：US10067748

    申请日：2002-02-08

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

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

    IPC分类号： H04B10/08

    CPC分类号： H04J14/0298 ,  H04B10/505 ,  H04B10/50572 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/0278

    摘要： Channels in an optical WDM network are each identified by at least two dither tones with which the channel is modulated, the dither tones alternating with a predetermined periodicity so that at any instant each channel is modulated by only one dither tone. The dither tones are continuously generated at precise frequencies. Channel detection by detecting the dither tones, for channels having optical powers over a wide dynamic range, makes use of an FFT process which can detect dither tones for high power channels in a single operation. Coherent averaging of FFT results over time is used to detect dither tones for low power channels over multiple FFT operations.

    摘要翻译： 光WDM网络中的信道各自由至少两个被调制信道的抖动音调来标识，该抖动音以预定周期交替，使得在任何时刻，每个信道仅被调制一个抖动音。 抖动色调以精确的频率连续生成。 对于具有宽动态范围内的光功率的信道，通过检测抖动音来进行信道检测，利用可以在单个操作中检测高功率信道的抖动音调的FFT处理。 FFT结果的相干平均随时间被用于通过多个FFT操作来检测低功率信道的抖动音调。

    Method and apparatus for spectrum analysis with variable detection latency and multiple layer coherent integrations
    5.
    发明授权
    Method and apparatus for spectrum analysis with variable detection latency and multiple layer coherent integrations 有权
    用于具有可变检测延迟和多层相干整合的频谱分析的方法和装置

    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。

    Signal identification in optical communications networks
    6.
    发明申请
    Signal identification in optical communications networks 有权

    公开(公告)号：US20060291870A1

    公开(公告)日：2006-12-28

    申请号：US11511248

    申请日：2006-08-29

    申请人： Ping Wan ,  Derrick Remedios ,  Patrick Chimfwembe

    发明人： Ping Wan ,  Derrick Remedios ,  Patrick Chimfwembe

    IPC分类号： H04B10/04

    CPC分类号： H04B10/505 ,  H04B10/50572 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/0278 ,  H04J14/0298

    摘要： Signals in an optical communications network, such as optical channels in an optical WDM network for example, are each identified by at least two low frequency dither tones with which the signal is modulated. The dither tones alternate with a predetermined periodicity to produce a cyclically repeated sequence of dither tones. A network parameter, such as a channel identifier for example, is obtained by the detection of the particular combination of dither tones in the sequence. To detect a number of network parameters a signal is modulated with a number of cyclically repeated sequences of dither tones each uniquely identifying a respective network parameter. In some implementations each dither tone in a cyclically repeated sequence of dither tones is repeated with substantially the same phase and coherent averaging is performed over a number of periods to detect dither tones on low power signals.

    Methods and apparatus for detecting a faulty component location along an optical path in an optical network
    7.
    发明申请
    Methods and apparatus for detecting a faulty component location along an optical path in an optical network 有权
    用于检测沿着光网络中的光路的故障部件位置的方法和装置

    公开(公告)号：US20050190359A1

    公开(公告)日：2005-09-01

    申请号：US11065098

    申请日：2005-02-25

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

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

    IPC分类号： G01M11/00 ,  G01N21/00 ,  H04B10/08

    CPC分类号： H04B10/077 ,  H04B10/07955

    摘要： A multi-stage method and apparatus for determining a faulty component location along an optical path through an optical fiber in an optical network are disclosed. The optical fiber carries a plurality of wavelengths, which may or may not be modulated by low frequency dither tones that are utilized for identification purposes and performance monitoring in the optical network. First, the method comprises measuring a total power of the optical fiber and a total wavelength power as a sum of powers of the individual wavelengths at a plurality of local detection points; comparing the measured powers at the local detection points; and determining whether or not a faulty detection point exists along the optical path. If a fault is identified, the method further provides a multi-stage fault detection procedure, which comprises measuring a total wavelength power loss between a local detection point and an adjacent detection point, between the local detection point and multiple non-adjacent detection points. A correlation of the measured total wavelength power losses between the various detection points is used for determining the faulty component location along the optical path. The apparatus, which incorporates the above multi-stage method for determining the faulty component location in the optical network, is also provided.

    摘要翻译： 公开了一种用于通过光网络中的光纤确定沿着光路的故障部件位置的多级方法和装置。 光纤承载多个波长，其可以或可以不被用于光网络中的识别目的和性能监视的低频抖动音调制。 首先，该方法包括测量光纤的总功率和总波长功率，作为多个局部检测点处各个波长的功率之和; 比较局部检测点的测量功率; 以及确定沿光路是否存在故障检测点。 如果识别故障，则该方法进一步提供多级故障检测程序，其包括测量本地检测点与相邻检测点之间，本地检测点与多个非相邻检测点之间的总波长功率损耗。 使用各个检测点之间测量的总波长功率损耗的相关性来确定沿光路的故障分量位置。 还提供了包括用于确定光网络中的故障部件位置的上述多级方法的装置。

    Method for network commissioning using amplified spontaneous emission (ASE) sources
    8.
    发明申请
    Method for network commissioning using amplified spontaneous emission (ASE) sources 失效
    使用放大自发辐射（ASE）来源进行网络调试的方法

    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。

    NOISE TONE AVOIDANCE IN OPTICAL NETWORKS
    9.
    发明申请
    NOISE TONE AVOIDANCE IN OPTICAL NETWORKS 有权
    光网络噪音消除

    公开(公告)号：US20070280700A1

    公开(公告)日：2007-12-06

    申请号：US11754341

    申请日：2007-05-28

    申请人： Derrick Remedios ,  James Benson Bacque ,  Ping Wai Wan

    发明人： Derrick Remedios ,  James Benson Bacque ,  Ping Wai Wan

    IPC分类号： H04B10/04

    CPC分类号： H04J14/0298 ,  H04B10/07 ,  H04B2210/075 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/028

    摘要： Identification of optical channels in wavelength division multiplex (WDM) optical networks may be confounded by unwanted noise tones interfering with pilot/dither tones used for identifying optical channels. The invention describes a method of selecting pilot/dither tones that are selectively restricted to avoid allocating dither/pilot tone frequencies that appear as noise tones along the path of an optical channel in the optical network.

    摘要翻译： 在波分多路复用（WDM）光网络中的光信道的识别可能会受到干扰用于识别光信道的导频/抖动音调的不利噪声音调的混淆。 本发明描述了一种选择限制的导频/抖动音调的方法，以避免分配出沿着光网络中的光信道路径出现的噪声音调的抖动/导频音频率。