公开(公告)号：US20100283996A1

公开(公告)日：2010-11-11

申请号：US12017041

申请日：2008-01-20

Applicant: Ping Wai WAN ,  Derrick Remedios ,  Patrick Chilufya Chimfwembe ,  Colin Geoffrey Kelly ,  James Benson Bacque

Inventor： Ping Wai WAN ,  Derrick Remedios ,  Patrick Chilufya Chimfwembe ,  Colin Geoffrey Kelly ,  James Benson Bacque

IPC: G01N21/00

CPC classification number: H04B10/0775 ,  H04B2210/075 ,  H04B2210/078

Abstract: A method and apparatus for distributed measurement of chromatic dispersion in an optical network is disclosed. The network comprises optical switching nodes interconnected by optical links. An optical link may comprise multiple spans, each span ending in a transport module which comprises signal-processing components. At least one optical switching node has a probing signal generator transmitting an optical probing signal along a selected path in the network. Probing-signal detectors placed at selected transport modules determine chromatic-dispersion values and send results to a processing unit which determines appropriate placement of compensators or appropriate adjustments of compensators placed along the path. A preferred probing signal has the form of wavelength modulated optical carrier which is further intensity modulated by a periodic, preferably sinusoidal, probing tone. Variation in the phase-shift of the probing tone corresponding to variation of the wavelength of the optical probing signal determines chromatic-dispersion characteristics for different spans of the path.

Abstract translation: 公开了一种用于分布式测量光网络色散的方法和装置。 网络包括通过光链路互连的光交换节点。 光链路可以包括多个跨度，每个跨度结束于传输模块，其包括信号处理组件。 至少一个光交换节点具有探测信号发生器，沿着网络中的选定路径发射光探测信号。 放置在所选传输模块处的探测信号检测器确定色散值并将结果发送到处理单元，该处理单元确定补偿器的适当位置或沿路径放置的补偿器的适当调整。 优选的探测信号具有波长调制光载波的形式，其进一步通过周期性的，优选正弦的探测色调进行强度调制。 与光探测信号的波长变化相对应的探测音的相移的变化确定了路径不同跨度的色散特性。

公开(公告)号：US07127165B2

公开(公告)日：2006-10-24

申请号：US10628418

申请日：2003-07-29

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

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

IPC: H04B10/08

CPC classification number: H04B10/079 ,  H04B10/07955 ,  H04B2210/075

Abstract: 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.

Abstract translation: 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：US06754413B2

公开(公告)日：2004-06-22

申请号：US10259597

申请日：2002-09-30

Applicant: James Benson Bacque ,  Patrick Chilufya Chimfwembe ,  Alex Ngi ,  Colin Geoffrey Kelly

Inventor： James Benson Bacque ,  Patrick Chilufya Chimfwembe ,  Alex Ngi ,  Colin Geoffrey Kelly

IPC: G02B628

CPC classification number: H04J14/02 ,  G02B6/29395

Abstract: Methods and devices are provided for optical demultiplexing and optical multiplexing. An optical wavelength demultiplexer adapted to perform wavelength demultiplexing of an input optical signal containing a plurality of wavelengths is provided. A tuneable filter in combination with a device with a required free spectral range results in a tuneable demultiplexer arrangement which eliminates the need to inventory large numbers of different demultiplexers. Similarly, tuneable lasers in combination with a device with a required free spectral range result in a tuneable multiplexer arrangement.

Abstract translation: 提供了用于光解复用和光复用的方法和装置。 提供了适用于对包含多个波长的输入光信号进行波长解复用的光学波长解复用器。 可调谐滤波器与具有所需自由频谱范围的设备相结合，产生可调谐的解复用器布置，其消除了对大量不同解复用器的清点的需要。 类似地，可调激光器与具有所需自由光谱范围的器件组合导致可调多路复用器布置。