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公开(公告)号：US07224909B2
公开(公告)日：2007-05-29
申请号：US10635561
申请日：2003-08-07
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。
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公开(公告)号：US20090257757A1
公开(公告)日：2009-10-15
申请号：US12488507
申请日：2009-06-19
IPC分类号： H04B10/06
CPC分类号： H04B10/50572 , H04B10/504 , H04B10/505 , H04J14/0258 , H04J14/0267 , H04J14/0276 , 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.
摘要翻译： 诸如光学WDM网络中的光信道的光通信网络中的信号每个由至少两个低频抖动音频来标识，该信号被调制。 抖动色调以预定周期交替，以产生循环重复的抖动色调序列。 通过检测序列中的抖动音调的特定组合来获得诸如通道标识符的网络参数。 为了检测多个网络参数，用多个循环重复的抖动音调序列来调制信号，每个序列都是唯一地识别相应的网络参数。 在一些实现中，以基本上相同的相位重复循环重复的抖动音调序列中的每个抖动音调，并且在多个周期上执行相干平均以检测低功率信号上的抖动音调。
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公开(公告)号：US07551858B2
公开(公告)日：2009-06-23
申请号：US11511248
申请日：2006-08-29
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.
摘要翻译： 诸如光学WDM网络中的光信道的光通信网络中的信号每个由至少两个低频抖动音频来标识，该信号被调制。 抖动色调以预定周期交替，以产生循环重复的抖动色调序列。 通过检测序列中的抖动音调的特定组合来获得诸如通道标识符的网络参数。 为了检测多个网络参数，用多个循环重复的抖动音调序列来调制信号，每个序列都是唯一地识别相应的网络参数。 在一些实现中，以基本上相同的相位重复循环重复的抖动音调序列中的每个抖动音调，并且在多个周期上执行相干平均以检测低功率信号上的抖动音调。
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公开(公告)号：US07869709B2
公开(公告)日：2011-01-11
申请号：US12488507
申请日：2009-06-19
CPC分类号： H04B10/50572 , H04B10/504 , H04B10/505 , H04J14/0258 , H04J14/0267 , H04J14/0276 , 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.
摘要翻译： 诸如光学WDM网络中的光信道的光通信网络中的信号每个由至少两个低频抖动音频来标识，该信号被调制。 抖动色调以预定周期交替，以产生循环重复的抖动色调序列。 通过检测序列中的抖动音调的特定组合来获得诸如通道标识符的网络参数。 为了检测多个网络参数，用多个循环重复的抖动音调序列来调制信号，每个序列都是唯一地识别相应的网络参数。 在一些实现中，以基本上相同的相位重复循环重复的抖动音调序列中的每个抖动音调，并且在多个周期上执行相干平均以检测低功率信号上的抖动音调。
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公开(公告)号：US07158723B2
公开(公告)日：2007-01-02
申请号：US10067748
申请日：2002-02-08
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。
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公开(公告)号：US07155122B2
公开(公告)日：2006-12-26
申请号：US10263959
申请日：2002-10-04
IPC分类号： H04B10/08
CPC分类号： H04J14/0227 , H04B10/504 , H04B10/505 , H04B10/50572 , H04J14/0241 , H04J14/0278 , H04J14/0298
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.
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公开(公告)号：US07054556B2
公开(公告)日：2006-05-30
申请号：US09972991
申请日：2001-10-10
IPC分类号： H04B17/00
CPC分类号： H04J14/0298 , H04B10/505 , H04B10/5051 , 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.
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8.发明授权公开(公告)号：US08014668B2
公开(公告)日：2011-09-06
申请号：US12017041
申请日：2008-01-20
申请人： Ping Wai Wan , Derrick Remedios , Patrick Chilufya Chimfwembe , Colin Geoffrey Kelly , James Benson Bacque
发明人： Ping Wai Wan , Derrick Remedios , Patrick Chilufya Chimfwembe , Colin Geoffrey Kelly , James Benson Bacque
CPC分类号： H04B10/0775 , H04B2210/075 , H04B2210/078
摘要： 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.
摘要翻译： 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。
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9.发明申请METHOD AND SYSTEM FOR DISTRIBUTED MEASUREMENT AND COMPENSATION OF CHROMATIC DISPERSION IN AN OPTICAL NETWORK 有权用于分布式测量的方法和系统和光网络中色散的补偿公开(公告)号：US20100283996A1
公开(公告)日：2010-11-11
申请号：US12017041
申请日：2008-01-20
申请人： Ping Wai WAN , Derrick Remedios , Patrick Chilufya Chimfwembe , Colin Geoffrey Kelly , James Benson Bacque
发明人： Ping Wai WAN , Derrick Remedios , Patrick Chilufya Chimfwembe , Colin Geoffrey Kelly , James Benson Bacque
IPC分类号： G01N21/00
CPC分类号： H04B10/0775 , H04B2210/075 , H04B2210/078
摘要： 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.
摘要翻译： 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。
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10.发明授权公开(公告)号：US07139486B2
公开(公告)日：2006-11-21
申请号：US10635544
申请日：2003-08-07
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。
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