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。

公开(公告)号：US07155122B2

公开(公告)日：2006-12-26

申请号：US10263959

申请日：2002-10-04

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： H04J14/0227 ,  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.

公开(公告)号：US07054556B2

公开(公告)日：2006-05-30

申请号：US09972991

申请日：2001-10-10

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： 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.

公开(公告)号：US20060092967A1

公开(公告)日：2006-05-04

申请号：US11265245

申请日：2005-11-03

申请人： Jeffrey Bergeron ,  Huck Loh ,  James Bacque ,  Derrick Remedios

发明人： Jeffrey Bergeron ,  Huck Loh ,  James Bacque ,  Derrick Remedios

IPC分类号： H04L12/66

CPC分类号： H04L12/2801

摘要： Ethernet packets are transmitted in full duplex mode over a single coaxial cable, such as RG6 and RG59. Symmetrical full duplex operation is achieved by separating the upstream and downstream signals in the frequency domain whereby a 100BaseT signal is transmitted unmodified in one direction while the other is modulated upon a high frequency carrier to be transmitted in the other direction. In a second embodiment, the separation is in the time domain whereby the signals are sampled in blocks, each block compressed in time and transmitted at a higher rate, thus allowing for the interleaving of upstream and downstream blocks on the same coaxial cable. In a third embodiment, different rate upstream and downstream signals are separated in the frequency domain, but without modulation. The resulting asymmetrical 1000/100 Mb/s Ethernet over coax link is valuable in network architectures where asymmetry in the up and down traffic loads is expected.

公开(公告)号：US06829438B2

公开(公告)日：2004-12-07

申请号：US09899151

申请日：2001-07-06

申请人： Wen Liu ,  Ping Wai Wan ,  Derrick Remedios

发明人： Wen Liu ,  Ping Wai Wan ,  Derrick Remedios

IPC分类号： H04J1402

CPC分类号： H04J14/0213 ,  H04J14/0206 ,  H04J14/0208 ,  H04J14/0209 ,  H04J14/021

摘要： In a WDM optical network, optical components of optical add/drop multiplexers (OADMs) at different nodes are made independent of the optical channel wavelengths to be dropped and added. Groups of optical channels each comprise a respective channel in each of a plurality of optical bands of channels having adjacent wavelengths, and the OADMs use tunable optical filters to drop and add channels in a selected group. A remote source supplies unmodulated optical carriers at channel wavelengths via an optical carrier fiber to each node, and at least one, conveniently all, of the optical carriers in a respective optical band is/are modulated with a signal to be transmitted via the add filter.

摘要翻译： 在WDM光网络中，不同节点处的光分插复用器（OADM）的光学部件独立于待丢弃和添加的光信道波长。 光通道组各自包括在具有相邻波长的多个通道光带中的每一个中的相应通道，并且OADM使用可调谐光学滤波器来降低和添加所选组中的通道。 远程源通过光载波光纤将信道波长的未调制光载波提供给每个节点，并且相应光带中的至少一个光学载波的所有光载波被调制，以经由加法滤波器传输的信号 。

公开(公告)号：US09425894B2

公开(公告)日：2016-08-23

申请号：US12916028

申请日：2010-10-29

申请人： Ping W. Wan ,  Derrick Remedios

发明人： Ping W. Wan ,  Derrick Remedios

IPC分类号： H04B10/08 ,  H04B10/077 ,  H04B10/079

CPC分类号： H04B10/0775 ,  H04B10/07953

摘要： Various embodiments relate to an in-band measurement of the optical signal-to-noise ratio (OSNR) of an optical signal in an optically-amplified transmission system. A demodulation device may tap a transmission fiber to receive an optical signal containing a low-frequency signal. A filter may implement first and second passbands to filter portions of an optical channel in the optical signal. Once the filtered channel is converted to first and second target electrical signals, a measurement circuit may take measurements of DC and AC components for each of the target electrical signals. Based on measurements of the two target electrical signals, the demodulation device may calculate the OSNR as a function of the DC and AC components, or as a function of the adjustment factors between first and second passbands of the optical channel represented by the first and second target electrical signals.

摘要翻译： 各种实施例涉及光放大传输系统中光信号的光信噪比（OSNR）的带内测量。 解调装置可以抽头传输光纤以接收包含低频信号的光信号。 滤波器可以实现第一和第二通带以过滤光信号中的光信道的部分。 一旦滤波的信道被转换成第一和第二目标电信号，测量电路可以对每个目标电信号进行DC和AC分量的测量。 基于两个目标电信号的测量，解调装置可以根据DC和AC分量来计算OSNR，或者作为由第一和第二信号表示的光信道的第一和第二通带之间的调整因子的函数 目标电信号。

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

IPC分类号： H04B10/00 ,  H04B10/08 ,  H04B10/12 ,  H04J14/08

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。

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。

公开(公告)号：US07548549B2

公开(公告)日：2009-06-16

申请号：US11265245

申请日：2005-11-03

申请人： Jeffrey James Bergeron ,  Huck Kung Loh ,  James Benson Bacque ,  Derrick Remedios

发明人： Jeffrey James Bergeron ,  Huck Kung Loh ,  James Benson Bacque ,  Derrick Remedios

IPC分类号： H04L12/413

CPC分类号： H04L12/2801

摘要： Ethernet packets are transmitted in full duplex mode over a single coaxial cable, such as RG6 and RG59. Symmetrical full duplex operation is achieved by separating the upstream and downstream signals in the frequency domain whereby a 100BaseT signal is transmitted unmodified in one direction while the other is modulated upon a high frequency carrier to be transmitted in the other direction. In a second embodiment, the separation is in the time domain whereby the signals are sampled in blocks, each block compressed in time and transmitted at a higher rate, thus allowing for the interleaving of upstream and downstream blocks on the same coaxial cable. In a third embodiment, different rate upstream and downstream signals are separated in the frequency domain, but without modulation. The resulting asymmetrical 1000/100 Mb/s Ethernet over coax link is valuable in network architectures where asymmetry in the up and down traffic loads is expected.

摘要翻译： 以全双工模式通过单个同轴电缆（如RG6和RG59）传输以太网数据包。 通过分离频域中的上行和下行信号来实现对称全双工操作，由此100BaseT信号在一个方向上未被修改而另一个在高频载波上被调制以在另一个方向上传输。 在第二实施例中，分离在时域中，由此信号以块为单位进行采样，每个块在时间上压缩并以较高的速率传输，从而允许同一同轴电缆上的上游和下游块的交错。 在第三实施例中，不同速率的上行和下行信号在频域中被分离，但是没有调制。 所产生的不对称1000 / 100Mb / s以太网同轴电缆链路在网络架构中是有价值的，其中预期上行和下行业务负载的不对称性。

公开(公告)号：US07321727B2

公开(公告)日：2008-01-22

申请号：US11178330

申请日：2005-07-12

申请人： Eddie Kai Ho Ng ,  Jason Christopher De Rocher ,  Derrick Remedios ,  James Benson Bacque ,  Ping Wai Wan

发明人： Eddie Kai Ho Ng ,  Jason Christopher De Rocher ,  Derrick Remedios ,  James Benson Bacque ,  Ping Wai Wan

IPC分类号： H04B10/08 ,  H04B17/00

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。