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1. 发明申请

US20140029957A1 FREQUENCY EQUALIZATION FOR AN OPTICAL TRANSMITTER 有权
标题翻译：用于光学发射机的频率均衡
公开(公告)号：US20140029957A1
公开(公告)日：2014-01-30
申请号：US13556635
申请日：2012-07-24
申请人： Chandrasekhar Sethumadhavan , Xiang Liu , Peter J. Winzer , Andrew Chraplyvy
发明人： Chandrasekhar Sethumadhavan , Xiang Liu , Peter J. Winzer , Andrew Chraplyvy
IPC分类号： H04B10/04
CPC分类号： H04B10/588
摘要： An optical transmitter configured to perform digital signal equalization directed at mitigating the detrimental effects of a frequency roll-off in the transmitter's optical I-Q modulator. In various embodiments, a frequency-dependent spectral-correction function used for the digital signal equalization can be constructed to cause the spectrum of the modulated optical signal generated by the transmitter to have a desired degree of flatness in the vicinity of an optical carrier frequency and/or to at least partially mirror the frequency roll-off in the optical I-Q modulator.
摘要翻译：一种光发射机，被配置为执行数字信号均衡，以减轻发射机的光学I-Q调制器中的频率滚降的有害影响。在各种实施例中，可以构造用于数字信号均衡的频率依赖频谱校正功能，以使由发射机产生的调制光信号的频谱在光载波频率附近具有期望的平坦度， /或至少部分地反映光学IQ调制器中的频率滚降。

2. 发明申请

US20120177372A1 Apparatus And Method For Generating Interleaved Return-To-Zero (IRZ) Polarization-Division Multiplexed (PDM) Signals 有权
标题翻译：用于生成交错归零（IRZ）偏振分复用（PDM）信号的装置和方法
公开(公告)号：US20120177372A1
公开(公告)日：2012-07-12
申请号：US12985835
申请日：2011-01-06
申请人： Xiang Liu , Chandrasekhar Sethumadhavan
发明人： Xiang Liu , Chandrasekhar Sethumadhavan
IPC分类号： H04J14/06 , H04B10/00
CPC分类号： H04B10/532 , H04B10/5053 , H04B10/5055 , H04B10/508 , H04B10/5162 , H04B10/5561
摘要： Return To Zero (RZ) shaping is performed for a first I/Q modulator whose output corresponds to a first polarization component using a first two digital-to-analog convertors (DACs), each of which is sampled at approximately twice a modulation symbol rate or more and has an output with a first interleaving order that interleaves one of a first pair of intended drive signal patterns and zeros. RZ shaping is also performed for a second I/Q modulator whose output corresponds to a second polarization component using a second two DACs, each sampled at approximately twice the modulation symbol rate or more and having a second interleaving order that interleaves zeros and one of a second pair of intended drive signal patterns, the second interleaving order opposite the first interleaving order. The first polarization and the second polarization may be combined, thereby forming an Interleaved Return To Zero (IRZ) Polarization Division Multiplexed (PDM) signal.
摘要翻译：对于其输出对应于使用前两个数模转换器（DAC）的第一偏振分量的第一I / Q调制器执行归零（RZ）整形，其中每一个被调制大约是调制符号率的两倍或具有具有交织第一对预期驱动信号模式和零之一的第一交错顺序的输出。还对第二I / Q调制器执行RZ整形，其第二I / Q调制器的输出对应于使用第二两个DAC的第二偏振分量，每个DAC以大约两倍的调制符号速率被采样，并且具有第二交织顺序，交织零和一个第二对预期驱动信号模式，第二交织顺序与第一交错顺序相反。可以组合第一偏振和第二偏振，从而形成交错回零（IRZ）偏振分复用（PDM）信号。

3. 发明申请

US20120148255A1 PILOT-ASSISTED DATA TRANSMISSION IN A COHERENT OPTICAL-COMMUNICATION SYSTEM 有权
标题翻译：在相关的光通信系统中的辅助数据传输
公开(公告)号：US20120148255A1
公开(公告)日：2012-06-14
申请号：US12964929
申请日：2010-12-10
申请人： Xiang Liu , Chandrasekhar Sethumadhavan
发明人： Xiang Liu , Chandrasekhar Sethumadhavan
IPC分类号： H04B10/04 , H04B10/00
CPC分类号： H04L25/0226 , H04B10/50 , H04L25/0224
摘要： In one embodiment, an optical transmission system transmits data using a format according to which a data frame has two or more pilot-symbol blocks, each having a guard interval, and two or more payload-symbol blocks that are concatenated without a guard interval between them. The use of guard intervals in the pilot-symbol blocks helps the synchronization and channel-estimation procedures performed at a receiver of the optical transmission system to be robust in the presence of certain transmission impairments. The absence of guard intervals in the payload-symbol blocks helps to minimize the transmission overhead and thus achieve relatively high payload-data throughput. Pilot-symbol blocks have a structure that enables the receiver to determine channel-response characteristics for each data frame and then apply appropriate channel-response-compensation procedures to signals corresponding to the payload-symbol blocks of the frame to recover, with a relatively low bit-error rate, the data encoded in those signals.
摘要翻译：在一个实施例中，光传输系统使用格式来传输数据，根据该格式，数据帧具有两个或更多个导频符号块，每个导频符号块具有保护间隔，以及两个或更多个有效载荷符号块，其间没有保护间隔他们。在导频符号块中使用保护间隔有助于在存在某些传输损伤的情况下在光传输系统的接收机处执行的同步和信道估计过程是鲁棒的。有效载荷符号块中没有保护间隔有助于最小化传输开销，从而实现相对较高的有效载荷数据吞吐量。导频符号块具有使得接收机能够确定每个数据帧的信道响应特性的结构，然后对相应于该帧的有效载荷符号块的信号应用适当的信道响应 - 补偿程序以相对较低的频率位错误率，这些信号中编码的数据。

4. 发明申请

US20110170873A1 Apparatus and Method For Generating Frequency-Locked Optical Comb Sources 有权
标题翻译：用于产生频率锁定光梳组源的装置和方法
公开(公告)号：US20110170873A1
公开(公告)日：2011-07-14
申请号：US12685470
申请日：2010-01-11
申请人： Xiang Liu , Chandrasekhar Sethumadhavan , Robert William Tkach
发明人： Xiang Liu , Chandrasekhar Sethumadhavan , Robert William Tkach
IPC分类号： H04J14/02 , H04B10/04
CPC分类号： H04B10/506 , H01S3/0085 , H01S3/2383 , H04J14/02
摘要： Frequency-locked optical comb sources are provided that utilize recirculating frequency shifting based on frequency conversion in a modulator, together with a filter. The filter may be a wavelength notch filter and include a plurality of notches. An example apparatus includes a coupler, an I/Q modulator, and a filter. A first input of the coupler receives a first input optical carrier having a first frequency, and a second input of the coupler re receives a set of frequency-shifted carriers from the filter. The input optical carrier may have a plurality of frequencies. The I/Q modulator shifts the frequency of a first output of the coupler. The filter filters modulated output from the I/Q modulator thereby limiting the frequency-shifted carriers to be within an optical bandwidth. A second output of the coupler provides a plurality of frequency-locked carriers containing the first input optical carrier and the set of frequency-shifted carriers.
摘要翻译：提供了频率锁定的光梳源，其与滤波器一起利用基于调制器中的频率转换的再循环频移。滤波器可以是波长陷波滤波器并且包括多个凹口。示例性装置包括耦合器，I / Q调制器和滤波器。耦合器的第一输入端接收具有第一频率的第一输入光载波，并且耦合器的第二输入端从滤波器接收一组频移载波。输入光载波可以具有多个频率。 I / Q调制器移动耦合器的第一输出的频率。滤波器对来自I / Q调制器的调制输出进行滤波，从而将频移载波限制在光带宽内。耦合器的第二输出提供包含第一输入光载波和该组频移载波的多个锁频载波。

5. 发明授权

US09300400B2 Communication through multiplexed one-dimensional optical signals 有权
标题翻译：通过多路复用一维光信号进行通信
公开(公告)号：US09300400B2
公开(公告)日：2016-03-29
申请号：US13731738
申请日：2012-12-31
申请人： Xiang Liu , Peter J Winzer , Andrew R Chraplyvy , Robert W Tkach , Chandrasekhar Sethumadhavan
发明人： Xiang Liu , Peter J Winzer , Andrew R Chraplyvy , Robert W Tkach , Chandrasekhar Sethumadhavan
IPC分类号： H04B10/12 , H04B10/2507 , H04B10/2513 , H04B10/516 , H04B10/50
CPC分类号： H04B10/2507 , H04B10/25137 , H04B10/5053 , H04B10/516
摘要： An example apparatus comprises an optical transmitter which includes a first processor and at least two optical modulators. The first processor is configured to generate a first electronic representation for each of at least two optical signals for carrying payload data modulated according to a one-dimensional (1-D) modulation format, and to induce on respective ones of the first electronic representations an amount of dispersion that depends on a power-weighted accumulated dispersion (ADPW) of a transmission link through which the at least two optical signals are to be transmitted thereby generating complex-valued electronic representations of pre-dispersion-compensated optical signals. Each of the at least two optical modulators modulate a respective analog version corresponding to a respective one of the complex-valued electronic representations onto a polarization of an optical carrier.
摘要翻译：示例性装置包括光发射机，其包括第一处理器和至少两个光调制器。第一处理器被配置为为至少两个光信号中的每一个生成用于承载根据一维（1-D）调制格式调制的有效载荷数据的第一电子表示，并且在第一电子表示中的相应的一个取决于要发送至少两个光信号的传输链路的功率加权累积色散（ADPW）的色散量，从而生成预色散补偿光信号的复值电子表示。所述至少两个光调制器中的每一个将对应于复值电子表示的相应模拟版本调制到光载波的偏振上。

6. 发明授权

US08923706B2 Frequency equalization for an optical transmitter 有权
标题翻译：光发射机的频率均衡
公开(公告)号：US08923706B2
公开(公告)日：2014-12-30
申请号：US13556635
申请日：2012-07-24
申请人： Chandrasekhar Sethumadhavan , Xiang Liu , Peter J. Winzer , Andrew Chraplyvy
发明人： Chandrasekhar Sethumadhavan , Xiang Liu , Peter J. Winzer , Andrew Chraplyvy
IPC分类号： H04B10/04 , H04B10/12
CPC分类号： H04B10/588
摘要： An optical transmitter configured to perform digital signal equalization directed at mitigating the detrimental effects of a frequency roll-off in the transmitter's optical I-Q modulator. In various embodiments, a frequency-dependent spectral-correction function used for the digital signal equalization can be constructed to cause the spectrum of the modulated optical signal generated by the transmitter to have a desired degree of flatness in the vicinity of an optical carrier frequency and/or to at least partially mirror the frequency roll-off in the optical I-Q modulator.
摘要翻译：一种光发射机，被配置为执行数字信号均衡，以减轻发射机的光学I-Q调制器中的频率滚降的有害影响。在各种实施例中，可以构造用于数字信号均衡的频率依赖频谱校正功能，以使由发射机产生的调制光信号的频谱在光载波频率附近具有期望的平坦度， /或至少部分地反映光学IQ调制器中的频率滚降。

7. 发明授权

US08660433B2 Pilot-assisted data transmission in a coherent optical-communication system 有权
标题翻译：在相干光通信系统中的导频辅助数据传输
公开(公告)号：US08660433B2
公开(公告)日：2014-02-25
申请号：US12964929
申请日：2010-12-10
申请人： Xiang Liu , Chandrasekhar Sethumadhavan
发明人： Xiang Liu , Chandrasekhar Sethumadhavan
IPC分类号： H04B10/532 , H04J14/02
CPC分类号： H04L25/0226 , H04B10/50 , H04L25/0224
摘要： In one embodiment, an optical transmission system transmits data using a format according to which a data frame has two or more pilot-symbol blocks, each having a guard interval, and two or more payload-symbol blocks that are concatenated without a guard interval between them. The use of guard intervals in the pilot-symbol blocks helps the synchronization and channel-estimation procedures performed at a receiver of the optical transmission system to be robust in the presence of certain transmission impairments. The absence of guard intervals in the payload-symbol blocks helps to minimize the transmission overhead and thus achieve relatively high payload-data throughput. Pilot-symbol blocks have a structure that enables the receiver to determine channel-response characteristics for each data frame and then apply appropriate channel-response-compensation procedures to signals corresponding to the payload-symbol blocks of the frame to recover, with a relatively low bit-error rate, the data encoded in those signals.
摘要翻译：在一个实施例中，光传输系统使用格式来传输数据，根据该格式，数据帧具有两个或更多个导频符号块，每个导频符号块具有保护间隔，以及两个或更多个有效载荷符号块，其间没有保护间隔他们。在导频符号块中使用保护间隔有助于在存在某些传输损伤的情况下在光传输系统的接收机处执行的同步和信道估计过程是鲁棒的。有效载荷符号块中没有保护间隔有助于最小化传输开销，从而实现相对较高的有效载荷数据吞吐量。导频符号块具有使得接收机能够确定每个数据帧的信道响应特性的结构，然后对相应于该帧的有效载荷符号块的信号应用适当的信道响应 - 补偿程序以相对较低的频率位错误率，这些信号中编码的数据。

8. 发明授权

US08594515B2 Digital phase conjugation for fiber-optic links 有权
标题翻译：光纤链路的数字相位共轭
公开(公告)号：US08594515B2
公开(公告)日：2013-11-26
申请号：US13039580
申请日：2011-03-03
申请人： Xiang Liu , Chandrasekhar Sethumadhavan , Robert W. Tkach
发明人： Xiang Liu , Chandrasekhar Sethumadhavan , Robert W. Tkach
IPC分类号： H04B10/06
CPC分类号： H04B10/2543 , H04J14/002 , H04L2027/0018
摘要： An optical phase conjugator that can be deployed within a long-haul fiber-optic link of an optical WDM system to improve the system's tolerance to intra- and inter-channel nonlinear effects. In one embodiment, the optical phase conjugator has a digital signal processor configured to perform, in the digital electrical domain, a phase-conjugation transformation for various components of a WDM signal so that certain signal distortions imposed on that signal in the front portion of the fiber-optic link are reduced in the back portion of the link. Advantageously, the optical phase conjugator is flexibly configurable to employ an input-to-output carrier-frequency-mapping configuration that is most beneficial under particular operating conditions. mapping configuration that is most beneficial under particular operating conditions.
摘要翻译：光相位共轭器可以部署在光学WDM系统的长距离光纤链路中，以提高系统对通道内和通道间非线性效应的容限。在一个实施例中，光相位共轭器具有数字信号处理器，其被配置为在数字电域中执行WDM信号的各种分量的相位共轭变换，使得施加在该信号的某些信号失真光纤链路在链路的后部减少。有利地，光相位共轭器可灵活地配置为采用在特定操作条件下最有利的输入到输出载波频率映射配置。在特定操作条件下最有利的映射配置。

9. 发明授权

US09344779B2 Method and apparatus for space-division multiplexing systems 有权
标题翻译：空分复用系统的方法和装置
公开(公告)号：US09344779B2
公开(公告)日：2016-05-17
申请号：US13602722
申请日：2012-09-04
申请人： Chandrasekhar Sethumadhavan , Xiang Liu , Peter J. Winzer , Alan H. Gnauck
发明人： Chandrasekhar Sethumadhavan , Xiang Liu , Peter J. Winzer , Alan H. Gnauck
IPC分类号： G02B6/036 , H04Q11/00 , G02B6/293 , H04J14/04 , H04J14/00 , H04J14/02 , G02B6/26 , G02B6/02
CPC分类号： H04Q11/0003 , G02B6/02042 , G02B6/26 , G02B6/29383 , H04J14/00 , H04J14/02 , H04J14/021 , H04J14/0212 , H04J14/04
摘要： A space division multiplexed (SDM) transmission system that includes at least two segments of transmission media in which a spatial assignment of the two segments is different is provided. For example, the SDM transmission may include a first segment of transmission media having a first spatial assignment and a second segment of transmission media having a second spatial assignment, wherein the first spatial assignment differs from the second spatial assignment. An example method obtains an optical signal on a first segment of transmission media having a first spatial assignment and forwards the optical signal on a second segment of transmission media with a different spatial assignment. The transmission media may be a multi-core fiber (MCF), a multi-mode fiber (MMF), a few-mode fiber (FMF), or a ribbon cable comprising nominally uncoupled single-mode fiber (SMF).
摘要翻译：提供了包括两个段的空间分配不同的至少两个传输介质段的空分复用（SDM）传输系统。例如，SDM传输可以包括具有第一空间分配的传输介质的第一段和具有第二空间分配的传输介质的第二段，其中第一空间分配与第二空间分配不同。示例性方法在具有第一空间分配的传输介质的第一段上获得光信号，并且在具有不同空间分配的第二传输介质段上转发光信号。传输介质可以是多芯光纤（MCF），多模光纤（MMF），多模光纤（FMF）或包括名义上脱耦单模光纤（SMF）的带状电缆）。

10. 发明授权

US08611751B2 System, apparatus and method for communicating data via polarization multiplexing 有权
标题翻译：用于通过偏振复用传送数据的系统，装置和方法
公开(公告)号：US08611751B2
公开(公告)日：2013-12-17
申请号：US12712247
申请日：2010-02-25
申请人： Xiang Liu , Chandrasekhar Sethumadhavan
发明人： Xiang Liu , Chandrasekhar Sethumadhavan
IPC分类号： H04J14/08 , H04B10/04 , H04B10/00
CPC分类号： H04B10/5053 , H04B10/532 , H04J14/06 , H04J14/08
摘要： Systems, apparatus and method for modulating digital data onto an optical carrier to produce a modulated optical carrier in which symbol-modulated optical signals of orthogonal polarizations are temporally interleaved and adapted to be processed by electronic time-division demultiplexing to recover the digital data modulated onto the orthogonal polarizations of the optical signals.
摘要翻译：用于将数字数据调制到光载波上以产生经调制的光载波的系统，装置和方法，其中正交偏振的符号调制光信号在时间上被交错并适于通过电子时分解复用进行处理，以恢复调制到光信号的正交偏振。

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