公开(公告)号：US06734955B2

公开(公告)日：2004-05-11

申请号：US10058948

申请日：2002-01-28

申请人： Mark Stephen Wight ,  Andreas Franz Ludwig Sizmann ,  Mei Du ,  Alan Glen Solheim

发明人： Mark Stephen Wight ,  Andreas Franz Ludwig Sizmann ,  Mei Du ,  Alan Glen Solheim

IPC分类号： G01N2100

CPC分类号： G01M11/338 ,  G01M11/335

摘要： A device for measuring dispersion of a link between two switching nodes of an optical network comprises a phase measuring unit PMU for determining a first phase of a data signal traveling on a first wavelength &lgr;1, and a second phase of the same data signal traveling on a second wavelength &lgr;2, received consecutively over the link under measurement. A dispersion measurement controller controls operation of the phase measuring unit and characterizes the dispersion of the link at a wavelength of interest &lgr;=(&lgr;1+&lgr;2)/2, based on the first and second phases. The PMU includes a frame detector for determining a first and a second rotation signal indicative of the digital offset between the first and second test clocks with a respective frame start, and a phase detector for measuring the phase of these test clocks with respect to a static reference. The static reference is provided by the same data signal transmitted continuously over a reference wavelength. The test and reference clocks are 1:n divided to extend the range of the measurement. A method for characterizing the dispersion of a link of an optical network is also provided.

摘要翻译： 用于测量光网络的两个交换节点之间的链路的色散的设备包括相位测量单元PMU，用于确定在第一波长λ1上行进的数据信号的第一相位，以及在第一波长λ1上行进的相同数据信号的第二相位 第二波长λ2，连续地在测量的链路上接收。 色散测量控制器控制相位测量单元的操作，并且基于第一和第二相来表征在感兴趣的波长λ=（λ1+λ2）/ 2处的链路的色散。 PMU包括帧检测器，用于确定表示第一和第二测试时钟之间的数字偏移的第一和第二旋转信号与相应的帧开始;以及相位检测器，用于测量这些测试时钟相对于静态的相位 参考。 静态参考由在参考波长上连续传输的相同数据信号提供。 测试和参考时钟为1：n，以扩展测量范围。 还提供了用于表征光网络的链路的色散的方法。

公开(公告)号：US06384963B2

公开(公告)日：2002-05-07

申请号：US09769083

申请日：2001-01-25

申请人： David Ackerman ,  Kenneth L. Bacher ,  William Dautremont-Smith ,  Mei Du ,  Karsten Rottwitt ,  Andrew John Stentz ,  Thomas A. Strasser ,  Liming Zhang

发明人： David Ackerman ,  Kenneth L. Bacher ,  William Dautremont-Smith ,  Mei Du ,  Karsten Rottwitt ,  Andrew John Stentz ,  Thomas A. Strasser ,  Liming Zhang

IPC分类号： H01S300

CPC分类号： H04B10/2916 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/09408 ,  H01S3/094096 ,  H01S3/302 ,  H01S5/1096 ,  H01S2301/03

摘要： A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50 mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.

摘要翻译： 光纤拉曼放大器被配置为使用共同传播的拉曼泵浦源，其可以在各种系统配置（例如，在双向通信系统中）是有益的。 通过仔细配置泵浦源特性，可以在共同传播装置中实现足够的光学增益，其特征包括：（1）使用至少50mW的光泵浦功率，（2）在 泵（以抑制SBS）; 和（3）每个泵浦激光器的所有纵向泵浦模式之间的频率差异至少被分离为泵浦激光器频率和信号频率之间的离散频率，并且不同泵浦激光器之间的所有强烈纵向模式至少被分离 通信系统的电气带宽。

公开(公告)号：US06417958B1

公开(公告)日：2002-07-09

申请号：US09768689

申请日：2001-01-24

申请人： Mei Du ,  Torben N. Nielsen ,  Karsten Rottwitt ,  Andrew John Stentz

发明人： Mei Du ,  Torben N. Nielsen ,  Karsten Rottwitt ,  Andrew John Stentz

IPC分类号： H01S300

CPC分类号： H04B10/2916 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/302 ,  H04J14/02

摘要： The use of a co-propagating fiber Raman amplifier in an optical WDM transmission system has been found to be practical in the situation where the fiber amplifier is operated into depletion and the characteristics of the input signals are controlled to exhibit a reduced integrated relative intensity noise (RIN) over the fiber crosstalk bandwidth. In particular, the reduction in the integrated RIN can be achieved by increasing the number of input channels (by adding more messages or simply using dummy channels), encoding the data in a particular fashion to reduce the integrated RIN, or decorrelating the plurality of N input signals below a predetermined, relatively low frequency (for example, 2 MHz).

摘要翻译： 已经发现在光学WDM传输系统中使用共同传播的光纤拉曼放大器在光纤放大器被耗尽的情况下是实用的，并且输入信号的特性被控制以表现出降低的集成相对强度噪声 （RIN）超过光纤串扰带宽。 特别地，集成RIN的减少可以通过增加输入通道的数量（通过添加更多消息或简单地使用虚拟通道）来实现，以特定方式对数据进行编码以减少集成RIN，或者将多个N 输入信号低于预定的相对较低的频率（例如2MHz）。