公开(公告)号：US07127181B2

公开(公告)日：2006-10-24

申请号：US11197699

申请日：2005-08-04

申请人： Alan H. Gnauck ,  Cedric F. Lam ,  Sheryl L. Woodward

发明人： Alan H. Gnauck ,  Cedric F. Lam ,  Sheryl L. Woodward

IPC分类号： H04B10/00 ,  H04B10/06 ,  H04B10/08 ,  H04B17/00

CPC分类号： H04B10/2507

摘要： Link robustness, chromatic dispersion and polarization mode dispersion (PMD) immunity can be improved in fiber optical system by using a method for receiving an optical double sideband signal over an optical fiber system, comprising the steps of splitting the received optical double sideband signal into an upper sideband signal and a lower sideband signal, photodetecting the upper sideband and the lower sideband, equalizing the photodetected upper sideband signal and the lower sideband signal, and combining the equalized upper sideband signal with the equalized lower sideband signal. While PMD compensation is envisioned as a major application, one may also use the method and system for chromatic dispersion compensation or dispersion slope compensation in high bit rate systems, i.e. using dispersion compensation fiber (DCF) for coarse compensation and diversity receiver with electrical equalizer for fine tuning.

摘要翻译： 通过使用用于在光纤系统上接收光学双边带信号的方法，可以在光纤系统中改善链路鲁棒性，色散和偏振模色散（PMD）抗扰度，包括以下步骤：将接收到的光双边带信号分割为 上侧边带信号和下边带信号，对上边带和下边带进行受光，均衡受光的上边带信号和下边带信号，并将均衡的上边带信号与均衡的下边带信号进行组合。 虽然PMD补偿被设想为主要应用，但是也可以在高比特率系统中使用用于色散补偿或色散斜率补偿的方法和系统，即使用用于粗调补偿的色散补偿光纤（DCF）和具有电均衡器的分集接收器 微调。

公开(公告)号：US06959154B1

公开(公告)日：2005-10-25

申请号：US09722646

申请日：2000-11-28

申请人： Alan H. Gnauck ,  Cedric F. Lam ,  Sheryl L. Woodward

发明人： Alan H. Gnauck ,  Cedric F. Lam ,  Sheryl L. Woodward

IPC分类号： G02B6/00 ,  H04B10/02 ,  H04B10/18 ,  H04B10/00 ,  H04B10/06 ,  H04B10/08 ,  H04B17/00

CPC分类号： H04B10/2507

摘要： Link robustness, chromatic dispersion and polarization mode dispersion (PMD) immunity can be improved in fiber optical system by using a method for receiving an optical double sideband signal over an optical fiber system, comprising the steps of splitting the received optical double sideband signal into an upper sideband signal and a lower sideband signal, photodetecting the upper sideband and the lower sideband, equalizing the photodetected upper sideband signal and the lower sideband signal, and combining the equalized upper sideband signal with the equalized lower sideband signal. While PMD compensation is envisioned as a major application, one may also use the method and system for chromatic dispersion compesation or dispersion slope compensation in high bit rate systems, i.e. using dispersion compensation fiber (DCF) for coarse compensation and diversity receiver with electrical equalizer for fine tuning.

摘要翻译： 通过使用用于在光纤系统上接收光学双边带信号的方法，可以在光纤系统中改善链路鲁棒性，色散和偏振模色散（PMD）抗扰度，包括以下步骤：将接收到的光双边带信号分割为 上侧边带信号和下边带信号，对上边带和下边带进行受光，均衡受光的上边带信号和下边带信号，并将均衡的上边带信号与均衡的下边带信号进行组合。 虽然PMD补偿被设想为主要应用，但也可以在高比特率系统中使用用于色散补偿或色散斜率补偿的方法和系统，即使用用于粗略补偿的色散补偿光纤（DCF）和具有电均衡器的分集接收器 微调。

公开(公告)号：US06661976B1

公开(公告)日：2003-12-09

申请号：US09477816

申请日：2000-01-05

申请人： Alan H. Gnauck ,  Cedric F. Lam ,  Sheryl Leigh Woodward

发明人： Alan H. Gnauck ,  Cedric F. Lam ,  Sheryl Leigh Woodward

IPC分类号： H04B1004

CPC分类号： H04B10/5051 ,  H04B10/505 ,  H04B10/5055 ,  H04B10/5165 ,  H04B10/58

摘要： A method and system for generating and transmitting optical signals with only one sideband. Single-sideband optical signal transmission reduces the signal impairment effects associated with dispersion. Such transmission also increases the spectral efficiency of optical transmission systems. Single-sideband modulation also makes possible electrical compensation for optical link dispersion during transmission. Single-sideband modulation is generated using the modulating data signal and its Hilbert transform, which is approximated by a tapped-delay time filter. Line coding is used to remove the low-frequency content in the modulating data signal, avoiding the inefficiencies of tapped-delay-line filter approximated Hilbert transformers at low frequencies. Line coding can also help optical single side band signal generation and transmission using a simple optical filter instead of Hilbert transformers.

摘要翻译： 一种只用一个边带产生和传输光信号的方法和系统。 单边带光信号传输降低了与色散相关的信号损害效应。 这种传输也增加了光传输系统的频谱效率。 单边带调制还可以在传输期间对光链路色散进行电补偿。 使用由抽头延迟时间滤波器近似的调制数据信号及其希尔伯特变换产生单边带调制。 线路编码用于去除调制数据信号中的低频内容，从而避免了在低频下抽头延迟线滤波器近似希尔伯特变换器的低效率。 线路编码还可以帮助使用简单的光学滤波器而不是希尔伯特变压器进行光学单边带信号生成和传输。

公开(公告)号：US08320760B1

公开(公告)日：2012-11-27

申请号：US13288555

申请日：2011-11-03

申请人： Cedric F. Lam ,  Hong Liu ,  Ryohei Urata

发明人： Cedric F. Lam ,  Hong Liu ,  Ryohei Urata

IPC分类号： H04J14/00

CPC分类号： H04J14/002 ,  H04J14/0257 ,  H04J14/0282

摘要： A passive optical network couples a WDM optical line terminal (“OLT”) to WDM optical network units (“ONUs”). The WDM OLT includes an optical transmitter array with coherent transmitters to generate downstream WDM signals encoded using phase modulation, an optical receiver array with direct detection photo-detectors to receive upstream WDM signals encoded with amplitude modulation, and an optical diplexer optically coupled to the optical transmitter array and the optical receiver array. The WDM ONU includes a tunable optical transmitter having a first tunable laser source coupled to generate a selectable upstream carrier wavelength and direct amplitude modulation circuitry coupled to amplitude modulate the first tunable laser source and a tunable optical receiver having coherent detection circuitry to demodulate phase information from the downstream WDM signals and a second tunable laser source operated as a local oscillator and coupled to tune to a selectable downstream carrier wavelength.

摘要翻译： 无源光网络将WDM光线路终端（OLT）耦合到WDM光网络单元（ONU）。 WDM OLT包括具有相干发射机的光发射机阵列以产生使用相位调制编码的下行WDM信号，具有直接检测光检测器的光接收器阵列以接收以幅度调制编码的上行WDM信号，以及与光学耦合的光双工器 发射器阵列和光接收器阵列。 WDM ONU包括可调光发射机，其具有耦合以产生可选择的上行载波波长的第一可调谐激光源和耦合到幅度调制第一可调谐激光源的直接幅度调制电路，以及具有相干检测电路的可调谐光学接收器，以从 下游WDM信号和作为本地振荡器操作的第二可调谐激光源，并被耦合以调谐到可选择的下行载波波长。

公开(公告)号：US20110292953A1

公开(公告)日：2011-12-01

申请号：US12788121

申请日：2010-05-26

申请人： Hong Liu ,  Cedric F. Lam

发明人： Hong Liu ,  Cedric F. Lam

IPC分类号： H01S3/10

CPC分类号： H01S5/06 ,  H01S5/005 ,  H01S5/0265 ,  H01S5/06256 ,  H01S5/1209 ,  H01S5/1215 ,  H01S5/4087 ,  H04B10/506

摘要： Techniques, devices and systems for optical communications based on wavelength division multiplexing (WDM) that use tunable multi-wavelength laser transmitter modules.

摘要翻译： 基于使用可调谐多波长激光发射器模块的波分复用（WDM）的光通信技术，设备和系统。

公开(公告)号：US08655167B1

公开(公告)日：2014-02-18

申请号：US12985041

申请日：2011-01-05

申请人： Cedric F. Lam ,  James F. Kelly ,  Austin B. Schuh

发明人： Cedric F. Lam ,  James F. Kelly ,  Austin B. Schuh

IPC分类号： H04B10/00

CPC分类号： H04J14/0227 ,  G01M11/3109 ,  H04B10/071 ,  H04J14/0212 ,  H04Q11/0067 ,  H04Q2011/0083

摘要： Implementations of techniques and systems are disclosed for detecting a fiber fault in a point-to-point optical access network based on optical time domain reflectometry (“OTDR”) measurements. The techniques include identifying loss of service between a central office (“CO”) and a given optical network unit (“ONU”) of a plurality of ONUs. In response to the identifying the loss of service, configuring a test signal distribution unit to optically couple an OTDR unit to a selected subset of the point-to-point fiber links which includes the given ONU. An optical test signal is launched from the OTDR unit into the selected subset of the point-to-point fiber links via the test signal distribution unit. Test signal reflections are received from each of the point-to-point fiber links within the selected subset as a reflection signature, which is analyzed to identify a location of the fiber fault.

摘要翻译： 公开了用于基于光时域反射测量（“OTDR”）测量来检测点对点光接入网络中的光纤故障的技术和系统的实现。 这些技术包括识别中心局（“CO”）与多个ONU的给定光网络单元（“ONU”）之间的服务丢失。 响应于识别服务丢失，配置测试信号分配单元将OTDR单元光学地耦合到包括给定ONU的点对点光纤链路的选定子集。 光测试信号通过测试信号分配单元从OTDR单元发射到点对点光纤链路的所选子集中。 从所选择的子集内的每个点对点光纤链路接收测试信号反射作为反射特征，被分析以识别光纤故障的位置。

公开(公告)号：US07466918B1

公开(公告)日：2008-12-16

申请号：US11860213

申请日：2007-09-24

申请人： Cedric F. Lam ,  Aleksandra Smiljanic

发明人： Cedric F. Lam ,  Aleksandra Smiljanic

IPC分类号： H04J14/00

CPC分类号： H04J14/021 ,  H04J14/0206

摘要： Wavelength assignment schemes that provide full-connectivity in RANs with fixed-tuned OADMs. In the first scheme, wavelengths are assigned to nodes according to Hadamard code, and in the second scheme, bands of contiguous wavelengths are assigned to nodes. Simulation results show that on the average, the Hadamard wavelength assignment schemes approach the performance of RANs with OADMs that add-drop all wavelengths, while saving 50% of the TDM terminals. The saving of TDM terminals by using wavelength tunable OADMs vary in different cases. Tunable OADMs are advantageous for lower traffic granularity and more interactions of a RAN with the outside network.

摘要翻译： 波长分配方案，可在具有固定调谐OADM的RAN中提供全连接。 在第一方案中，根据Hadamard码将波长分配给节点，并且在第二方案中，连续波长的频带被分配给节点。 模拟结果表明，平均来说，Hadamard波长分配方案接近具有OADMs的RAN的性能，可以减少所有波长的吞吐量，同时节省50％的TDM终端。 使用波长可调OADM节省TDM终端在不同情况下有所不同。 可调整OADM对于降低流量粒度和RAN与外部网络的更多交互是有利的。

公开(公告)号：US07366417B2

公开(公告)日：2008-04-29

申请号：US11328782

申请日：2006-01-10

申请人： Mark D. Feuer ,  Nicholas J. Frigo ,  Cedric F. Lam

发明人： Mark D. Feuer ,  Nicholas J. Frigo ,  Cedric F. Lam

IPC分类号： H04J14/00

CPC分类号： H04Q11/0005 ,  H04Q11/0062 ,  H04Q2011/0016 ,  H04Q2011/0022 ,  H04Q2011/0026 ,  H04Q2011/0032 ,  H04Q2011/0035 ,  H04Q2011/0047 ,  H04Q2011/0058

摘要： A method and a system in which selected wavelengths of a wavelength division multiplexed (WDM) signal are modulated with multicast data for multicasting data services on an optical network. The WDM signal is received from a hub node of the optical network, such as a unidirectional ring network or a bi-directional ring network. A four-port wavelength crossbar switch (4WCS) selectably switches selected wavelengths from the optical network to a modulator loop. The modulator loop includes a multicast modulator that modulates the selected plurality of wavelengths with the multicast data. Each modulated wavelength is then switched back to the optical network by the 4WCS switch, and sent to a plurality of subscriber nodes of the optical network. This architecture allows a facility provider to be physically separated from a content provider, and affords the flexibility of selectively delivering multicast content to individual subscribers.

摘要翻译： 一种方法和系统，其中波分复用（WDM）信号的选定波长用组播数据进行调制，用于在光网络上组播数据业务。 从光网络的集线器节点（例如单向环网或双向环网）接收WDM信号。 四端口波长交叉开关（4WCS）可选择地将所选波长从光网络切换到调制器环路。 调制器环路包括用多播数据调制所选择的多个波长的多播调制器。 然后通过4WCS交换机将每个调制波长切换回光网络，并发送到光网络的多个订户节点。 该架构允许设施提供者在物理上与内容提供商分离，并且提供选择性地将多播内容递送给个体用户的灵活性。

公开(公告)号：US06697574B2

公开(公告)日：2004-02-24

申请号：US09822821

申请日：2001-04-02

申请人： Nicholas J. Frigo ,  Patrick P Iannone ,  Cedric F. Lam ,  Kenneth C Reichmann

发明人： Nicholas J. Frigo ,  Patrick P Iannone ,  Cedric F. Lam ,  Kenneth C Reichmann

IPC分类号： H04J1400

CPC分类号： H04Q11/0005 ,  H04J14/02 ,  H04Q2011/0015 ,  H04Q2011/0016 ,  H04Q2011/0032 ,  H04Q2011/0047 ,  H04Q2011/0049

摘要： An optical telecommunications network suitable for carrying broadcast and switched services. The network includes a wavelength division multiplexing (WDM) coupled to a waveguide grating router (WGR). In accordance with the invention, an adjacent input port is connected with the same optical content. Thus, its outputs are adjacent (or wrapped around). According, the optical power in each of the broadcast bands at the outputs remains the same but is reduced by a factor of two in power for each channel but occupying twice as many channels. This has the effect of increasing the SNR by a factor of two.

摘要翻译： 适用于承载广播和交换业务的光通信网络。 网络包括耦合到波导光栅路由器（WGR）的波分复用（WDM）。 根据本发明，相邻的输入端口与相同的光学内容连接。 因此，其输出是相邻的（或缠绕的）。 据说，输出中每个广播频带的光功率保持不变，但每个频道的功率减少了2倍，但占用的频道数量是两倍。 这具有将SNR增加一倍的效果。

公开(公告)号：US08781322B2

公开(公告)日：2014-07-15

申请号：US13205055

申请日：2011-08-08

申请人： Cedric F. Lam ,  Hong Liu

发明人： Cedric F. Lam ,  Hong Liu

IPC分类号： H04J14/00

CPC分类号： H04J14/0282 ,  H04J14/0232 ,  H04J14/0235 ,  H04J14/0246 ,  H04J14/0247 ,  H04J14/025 ,  H04J14/0252 ,  H04J14/0265

摘要： A hybrid passive optical network (“PON”) includes a time-division multiplexing (“TDM”) optical line terminal (“OLT”) and a wavelength-division multiplexing (“WDM”) OLT. The TDM OLT communicates with a first group of customer premises (“CPs”) via TDM signals while the WDM OLT communicates with a second group of CPs via WDM signals. A remote node power splitter is coupled to receive the TDM and WDM signals and broadcast both the TDM signals and the WDM signals on all of its ports facing towards the CPs. Optical filters are disposed between the remote node power splitter and the second group of CPs. Each optical filter is configured to pass a sub-group of the WDM signals while blocking other WDM signals such that each of the second group of CPs receives its own allocation of WDM signals but does not receive WDM signals allocated to other CPs of the second group of CPs.

摘要翻译： 混合无源光网络（“PON”）包括时分复用（“TDM”）光线路终端（“OLT”）和波分复用（“WDM”）OLT。 TDM OLT经由TDM信号与第一组客户端（“CP”）通信，而WDM OLT经由WDM信号与第二组CPC通信。 远程节点功率分配器被耦合以接收TDM和WDM信号，并且在其面向CP的所有端口上广播TDM信号和WDM信号。 光学滤波器设置在远程节点功率分配器和第二组CP之间。 每个滤光器被配置成通过WDM信号的子组同时阻挡其它WDM信号，使得第二组CP中的每一个接收到其自己的WDM信号分配，但是不接收分配给第二组的其他CP的WDM信号 的CP。