公开(公告)号：US06529303B1

公开(公告)日：2003-03-04

申请号：US09405367

申请日：1999-09-24

申请人： Michael W. Rowan ,  David B. Upham ,  Augustus Elmer ,  Laurence J. Newell ,  David A. Pechner ,  Abraham Kou ,  James F. Coward ,  Norman L. Swenson ,  Minnie Ho ,  Peter H. Chang ,  Ting K. Yee ,  Stuart E. Wilson

发明人： Michael W. Rowan ,  David B. Upham ,  Augustus Elmer ,  Laurence J. Newell ,  David A. Pechner ,  Abraham Kou ,  James F. Coward ,  Norman L. Swenson ,  Minnie Ho ,  Peter H. Chang ,  Ting K. Yee ,  Stuart E. Wilson

IPC分类号： H04J1402

CPC分类号： B82Y15/00 ,  H04B10/2513 ,  H04J1/08 ,  H04J1/14 ,  H04J14/0298 ,  H04L5/06 ,  H04L27/34

摘要： A frequency division multiplexing (FDM) node used in optical communications networks provides add-drop multiplexing (ADM) functionality between optical high-speed channels and electrical low-speed channels. The FDM node includes a high-speed system and an ADM crosspoint. The high-speed system converts between an optical high-speed channel and its constituent electrical low-speed channels through the use of frequency division multiplexing and preferably also QAM modulation. The ADM crosspoint couples incoming low-speed channels to outgoing low-speed channels, thus implementing the ADM functionality for the FDM node.

摘要翻译： 在光通信网络中使用的频分复用（FDM）节点在光高速信道和电低速信道之间提供了添加多路复用（ADM）功能。 FDM节点包括高速系统和ADM交叉点。 高速系统通过使用频分多路复用并优选地也进行QAM调制，在光学高速信道与其组成的低速信道之间进行转换。 ADM交叉点将输入低速通道耦合到输出低速通道，从而实现FDM节点的ADM功能。

公开(公告)号：US06452945B1

公开(公告)日：2002-09-17

申请号：US09229594

申请日：1999-01-13

申请人： David B. Upham ,  Augustus Elmer ,  Laurence J. Newell ,  David A. Pechner ,  Abraham Kou ,  Michael W. Rowan ,  James F. Coward ,  Norman L. Swenson ,  Minnie Ho

发明人： David B. Upham ,  Augustus Elmer ,  Laurence J. Newell ,  David A. Pechner ,  Abraham Kou ,  Michael W. Rowan ,  James F. Coward ,  Norman L. Swenson ,  Minnie Ho

IPC分类号： H04J308

CPC分类号： H04J14/0298 ,  H04L1/0057 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/0071 ,  H04L5/06 ,  H04L27/34 ,  H04L27/36 ,  H04L27/38 ,  H04L2001/0096

摘要： A frequency division multiplexing (FDM) node used in optical communications networks provides add-drop multiplexing (ADM) functionality between optical high-speed channels, and low-speed tributaries. The FDM node includes a high-speed system and an ADM crosspoint. The high-speed system converts between an optical high-speed channel and its constituent electrical, low-speed channels through the use of frequency division multiplexing. The ADM crosspoint couples any incoming low-speed channels and any incoming tributaries to any outgoing low-speed channels and tributaries, thus implementing the ADM functionality for the FDM node.

摘要翻译： 在光通信网络中使用的频分复用（FDM）节点在光学高速信道和低速支路之间提供分插复用（ADM）功能。 FDM节点包括高速系统和ADM交叉点。 高速系统通过使用频分复用在光高速信道与其组成的电，低速信道之间进行转换。 ADM交叉点将任何传入的低速信道和任何传入的支路耦合到任何传出的低速信道和支路，从而实现FDM节点的ADM功能。

公开(公告)号：US06204951B1

公开(公告)日：2001-03-20

申请号：US09082620

申请日：1998-05-19

申请人： James F. Coward ,  Ting K. Yee ,  Peter Chang ,  Abraham Kou

发明人： James F. Coward ,  Ting K. Yee ,  Peter Chang ,  Abraham Kou

IPC分类号： G02F103

CPC分类号： G02F1/225 ,  G02F1/2255 ,  G02F2203/19

摘要： An electro-optic modulator includes a splitting section, at least three transmission legs, an RF phase-shifting section, a DC-phase shifting section, and a combining section. The splitting section splits a received optical signal into sub-signals, one for each transmission leg. The RF phase-shifting section phase shifts at least two of the sub-signals by an amount proportional to a received RF signal; while the DC phase-shifting section phase shifts at least two of the sub-signals by a DC phase. The combining section combines the phase-shifted sub-signals into a modulated optical signal. In a preferred embodiment, the modulator is characterized by design parameters, such as splitting ratio, DC phase shift, RF coupling efficiency, and combining ratio, and these design parameters are selected to ensure that the modulator meets predetermined performance characteristics, such as maximum harmonic levels or minimum signal to noise ratios.

摘要翻译： 电光调制器包括分离部分，至少三个传输腿，RF相移部分，DC相移部分和组合部分。 分离部分将接收到的光信号分成子信号，每个传输分支一个。 RF相移部分将至少两个子信号相移一个与所接收的RF信号成比例的量; 而直流相移部分通过DC相位将至少两个子信号相移。 组合部分将相移的子信号组合成调制的光信号。 在优选实施例中，调制器的特征在于设计参数，例如分频比，DC相移，RF耦合效率和组合比，并且选择这些设计参数以确保调制器满足预定的性能特性，例如最大谐波 电平或最小信噪比。