公开(公告)号：US07308169B2

公开(公告)日：2007-12-11

申请号：US10922690

申请日：2004-08-19

申请人： Sethumadhavan Chandrasekhar ,  Andrew R. Chraplyvy ,  Christopher Richard Doerr ,  Peter J. Winzer

发明人： Sethumadhavan Chandrasekhar ,  Andrew R. Chraplyvy ,  Christopher Richard Doerr ,  Peter J. Winzer

IPC分类号： G02B6/26

CPC分类号： H04B10/2507 ,  G02B6/266 ,  H04J14/0221

摘要： A multi-channel optical equalizer for intersymbol interference mitigation compensates for single- or multi-wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer also compensates for overshoots and signal transition degradations in semiconductor optical amplifiers. The equalizer unit uses one control signal for magnitude and one to control signal phase. The equalizer includes a controllable coupling ratio coupler for splitting the light into two portions and a controllable interferometer having two arms, one arm having an additional delay which is equal to an integer multiple of 1/Δf, where Δf is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. A multistage optical equalizer is implemented using a plurality of optical signal equalizers.

摘要翻译： 用于符号间干扰减轻的多通道光学均衡器同时补偿单波长或多波长通道，并且需要很少的可调参数。 光学均衡器还补偿半导体光放大器中的过冲和信号转换劣化。 均衡器单元使用一个控制信号的幅度和一个来控制信号相位。 均衡器包括可控耦合比耦合器，用于将光分成两部分，以及具有两个臂的可控干涉仪，一个臂具有等于1 / Deltaf的整数倍的附加延迟，其中Deltaf是相邻波长之间的信道间隔 用于光学系统。 可控干涉仪在第一或第二臂中具有可控制的延迟，用于调节通过其中的光的相对相位。 耦合器组合来自第一和第二臂的两个信号部分以形成均衡的输出信号。 使用多个光信号均衡器来实现多级光学均衡器。

公开(公告)号：US06804434B1

公开(公告)日：2004-10-12

申请号：US10735176

申请日：2003-12-12

申请人： Sethumadhavan Chandrasekhar ,  Andrew Roman Chraplyvy ,  Christopher Richard Doerr ,  Peter J. Winzer

发明人： Sethumadhavan Chandrasekhar ,  Andrew Roman Chraplyvy ,  Christopher Richard Doerr ,  Peter J. Winzer

IPC分类号： G02B626

CPC分类号： H04B10/1149 ,  G02B6/266 ,  H04B10/2507 ,  H04J14/0221

摘要： A multi-channel optical equalizer for intersymbol interference mitigation compensates for single- or multi- wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer compensates for overshoots and signal transition degradations in semiconductor optical amplifiers. The equalizer unit uses one control signal for magnitude and one to control signal phase. The equalizer includes a controllable coupling ratio coupler for splitting the light into two portions and a controllable interferometer having two arms, one arm having an additional delay which is equal to an integer multiple of 1/&Dgr;f, where &Dgr;f is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal.

摘要翻译： 用于符号间干扰减轻的多通道光学均衡器同时补偿单波长或多波长通道，并且需要很少的可调参数。 光学均衡器补偿半导体光放大器中的过冲和信号转换劣化。 均衡器单元使用一个控制信号的幅度和一个来控制信号相位。 均衡器包括可控耦合比耦合器，用于将光分成两部分，以及具有两个臂的可控干涉仪，一个臂具有等于1 / Deltaf的整数倍的附加延迟，其中Deltaf是相邻波长之间的信道间隔 用于光学系统。 可控干涉仪在第一或第二臂中具有可控制的延迟，用于调节通过其中的光的相对相位。 耦合器组合来自第一和第二臂的两个信号部分以形成均衡的输出信号。

公开(公告)号：US06785446B1

公开(公告)日：2004-08-31

申请号：US10393483

申请日：2003-03-20

申请人： Sethumadhavan Chandrasekhar ,  Andrew Roman Chraplyvy ,  Christopher Richard Doerr ,  Peter J. Winzer

发明人： Sethumadhavan Chandrasekhar ,  Andrew Roman Chraplyvy ,  Christopher Richard Doerr ,  Peter J. Winzer

IPC分类号： G02B626

CPC分类号： H04B10/1149 ,  G02B6/266 ,  H04B10/2507 ,  H04J14/0221

摘要： An improved multi-channel optical equalizer method and apparatus for intersymbol interference mitigation compensates many wavelength channels simultaneously and requires few adjustable parameters. The equalizer unit has only two control signals, one to control signal magnitude and one to control signal phase, yet it can still compensate many wavelength channels simultaneously. The equalizer includes a coupler with a controllable coupling ratio for splitting the light into two portions and a controllable interferometer means having two arms, one arm having an additional delay which is equal to an integer multiple of 1/&Dgr;f, where &Dgr;f is the channel spacing of the multiwavelength system. The controllable interferometer unit also has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal.

摘要翻译： 用于符号间干扰减轻的改进的多通道光均衡器方法和装置同时补偿许多波长信道，并且需要很少的可调参数。 均衡器单元只有两个控制信号，一个用于控制信号幅度，一个控制信号相位，但它仍然可以同时补偿许多波长信道。 均衡器包括具有可控耦合比的耦合器，用于将光分成两部分，以及具有两个臂的可控干涉仪装置，一个臂具有等于1 / Deltaf的整数倍的附加延迟，其中Deltaf是沟道间隔 的多波长系统。 可控干涉仪单元还具有用于调节通过其中的光的相对相位的第一或第二臂中的可控延迟。 耦合器组合来自第一和第二臂的两个信号部分以形成均衡的输出信号。

公开(公告)号：US07477852B2

公开(公告)日：2009-01-13

申请号：US11047011

申请日：2005-01-31

申请人： Anjali Agarwal ,  Andreas Benz ,  Sethumadhavan Chandrasekhar ,  Peter J. Winzer

发明人： Anjali Agarwal ,  Andreas Benz ,  Sethumadhavan Chandrasekhar ,  Peter J. Winzer

IPC分类号： H04B10/00

CPC分类号： H04B10/677 ,  H04B10/674 ,  H04B10/69

摘要： A method and apparatus for receiving narrowband filtered optical PSK signals, including converting PSK optical signals into intensity-modulated signals at a receiver, and introducing a desired amplitude imbalance between the first and the second intensity-modulated signals to improve receiver performance.

摘要翻译： 一种用于接收窄带滤波的光PSK信号的方法和装置，包括将PSK光信号转换成在接收机处的强度调制信号，并且在第一和第二强度调制信号之间引入期望的幅度不平衡以提高接收机性能。

公开(公告)号：US06996307B2

公开(公告)日：2006-02-07

申请号：US10657979

申请日：2003-09-09

申请人： Sethumadhavan Chandrasekhar ,  Christopher Richard Doerr ,  Yikai Su

发明人： Sethumadhavan Chandrasekhar ,  Christopher Richard Doerr ,  Yikai Su

IPC分类号： G02B6/28 ,  H04J14/02

CPC分类号： G02B6/2931 ,  G02B6/29314 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/0206 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0219

摘要： A variable bandwidth hierarchical OADM apparatus and method handles different data rates, based on a waveband OADM and one or more wavelength OADMs in parallel. The wavelength OADM combines multiple adjacent channels with fine granularity up to the bandwidth of the waveband OADM. The wavebands and wavelengths to be passed, dropped, and added by the hierarchical OADM apparatus are all electronically selectable, hence no hardware modification is needed when the data rate is changed. The use of a coarse granularity waveband OADM and variable-bandwidth wavelength OADM with fine granularity enables our hierarchical OADM apparatus and method to provide a variable-bandwidth multi-granularity add/drop capability.

摘要翻译： 可变带宽分级OADM装置和方法基于波段OADM和并行的一个或多个波长OADM来处理不同的数据速率。 波长OADM将多个相邻信道与精细粒度组合，直到波段OADM的带宽。 由分层OADM设备传递，丢弃和添加的波段和波长都是电子可选择的，因此在数据速率改变时不需要硬件修改。 使用粗粒度波段OADM和具有细粒度的可变带宽波长OADM使我们的分层OADM设备和方法能够提供可变带宽的多粒度添加/删除功能。

公开(公告)号：US20050053325A1

公开(公告)日：2005-03-10

申请号：US10657979

申请日：2003-09-09

申请人： Sethumadhavan Chandrasekhar ,  Christopher Doerr ,  Yikai Su

发明人： Sethumadhavan Chandrasekhar ,  Christopher Doerr ,  Yikai Su

IPC分类号： G02B6/34 ,  H04J14/02 ,  G02B6/28

CPC分类号： G02B6/2931 ,  G02B6/29314 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/0206 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0219

摘要： A variable bandwidth hierarchical OADM apparatus and method handles different data rates, based on a waveband OADM and one or more wavelength OADMs in parallel. The wavelength OADM combines multiple adjacent channels with fine granularity up to the bandwidth of the waveband OADM. The wavebands and wavelengths to be passed, dropped, and added by the hierarchical OADM apparatus are all electronically selectable, hence no hardware modification is needed when the data rate is changed. The use of a coarse granularity waveband OADM and variable-bandwidth wavelength OADM with fine granularity enables our hierarchical OADM apparatus and method to provide a variable-bandwidth multi-granularity add/drop capability.

摘要翻译： 可变带宽分级OADM装置和方法基于波段OADM和并行的一个或多个波长OADM来处理不同的数据速率。 波长OADM将多个相邻信道与精细粒度组合，直到波段OADM的带宽。 由分层OADM设备传递，丢弃和添加的波段和波长都是电子可选择的，因此在数据速率改变时不需要硬件修改。 使用粗粒度波段OADM和具有细粒度的可变带宽波长OADM使我们的分层OADM设备和方法能够提供可变带宽的多粒度添加/删除功能。

公开(公告)号：US20080158643A1

公开(公告)日：2008-07-03

申请号：US11617350

申请日：2006-12-28

申请人： Andrew Adamiecki ,  Sethumadhavan Chandrasekhar ,  Christopher Doerr ,  David Neilson ,  Peter Winzer

发明人： Andrew Adamiecki ,  Sethumadhavan Chandrasekhar ,  Christopher Doerr ,  David Neilson ,  Peter Winzer

IPC分类号： G02F1/01

CPC分类号： H04B10/5167

摘要： Duobinary and NRZ modulation of an X-Gb/s optical signal is achieved with a lumped element InP Mach-Zehnder device configured to operate at X/k-Gb/s where k>1 and arranged in a push-pull configuration.

摘要翻译： 使用集成元件InP Mach-Zehnder器件实现X-Gb / s光信号的二进制和NRZ调制，其被配置为以k> 1并且以推挽配置布置的X / k-Gb / s操作。

公开(公告)号：US07333553B2

公开(公告)日：2008-02-19

申请号：US10855449

申请日：2004-05-27

申请人： Sethumadhavan Chandrasekhar ,  Peter Winzer

发明人： Sethumadhavan Chandrasekhar ,  Peter Winzer

IPC分类号： H04L25/34

CPC分类号： H04B10/505 ,  H04B10/5167

摘要： An apparatus and method for tunably delaying a signal and using that delayed signal in a duobinary transmitter is described. The transmitted duobinary signal is representative of the binary signal, and is formed by, among other things, introducing into a copy of the binary signal a delay that may be adjusted to be greater than or less than the bit period of the signal. Once the binary signal has been converted into a duobinary signal, it may then be converted into an optical duobinary signal. Alternatively, the conversion from binary to duobinary in accordance with the invention may be performed in the optical domain.

摘要翻译： 描述了一种用于可调延迟信号并在双二进制发送器中使用该延迟信号的装置和方法。 发送的双二进制信号表示二进制信号，并且通过将二进制信号的副本引入可被调整为大于或小于信号的位周期的延迟来形成。 一旦二进制信号已经被转换为双二进制信号，则可将其转换成光双二进制信号。 或者，根据本发明的二进制转换为二进制可以在光域中执行。

公开(公告)号：US06400860B1

公开(公告)日：2002-06-04

申请号：US09528979

申请日：2000-03-21

申请人： Sethumadhavan Chandrasekhar ,  Jiten Sarathy

发明人： Sethumadhavan Chandrasekhar ,  Jiten Sarathy

IPC分类号： G02B628

CPC分类号： G02B6/12011 ,  G02B6/12023 ,  G02B6/122

摘要： A wavelength selective polarization beam device uses waveguide grating routers (WGRs) having birefringent grating waveguides. When the device is used as a splitter it separates different wavelength channels of a wavelength division multiplexed (WDM) signal as well as the orthogonal polarization components of each wavelength channel. Since the WGR device is reciprocal, it can also be used as a combiner to combine the orthogonal polarization components of each wavelength channel into a WDM signal.

摘要翻译： 波长选择偏振光束装置使用具有双折射光栅波导的波导光栅路由器（WGR）。 当该器件用作分离器时，其分离波分复用（WDM）信号的不同波长信道以及每个波长信道的正交偏振分量。 由于WGR设备是互逆的，所以它也可以用作组合器以将每个波长信道的正交偏振分量组合成WDM信号。

公开(公告)号：US06262411B1

公开(公告)日：2001-07-17

申请号：US09365943

申请日：1999-08-02

申请人： Sethumadhavan Chandrasekhar

发明人： Sethumadhavan Chandrasekhar

IPC分类号： H01J4014

CPC分类号： H04L7/02 ,  H04B10/69 ,  H04L7/0037

摘要： A direct detector uses optical amplification and resistors to eliminate the need for linear electrical amplifiers. The receives evenly splits an input light wave along a clock path and a data recovery path. Along the clock path a first photodetector detects the light wave. The input power induces a current across a first resistor in series with the photodetector giving rise to a voltage V which becomes the input voltage to the cock recovery device. The output from the clock recovery device is then split by an optical power splitter with one output to a decision circuit and another output optionally available for external use. Along the data path the light wave is split a second time and each of the two resultant paths are detected by a photodetector in series with a resistor. The decision circuit has input pins from each of the photodetectors to provide the data signal and its average DC voltage in lieu of the complement of the data signal as inputs to the decision circuit. The decision circuit outputs the data and its average.

摘要翻译： 直接检测器使用光放大和电阻来消除线性电放大器的需要。 接收器沿着时钟路径和数据恢复路径均匀地分离输入光波。 沿着时钟路径，第一光电检测器检测光波。 输入功率引起与光电检测器串联的第一电阻器的电流，产生电压V，该电压V成为旋塞恢复装置的输入电压。 然后来自时钟恢复装置的输出由具有一个输出的光功率分配器分配到判定电路，并且可选地可供外部使用的另一输出。 沿着数据路径，光波被分开第二次，并且两个合成路径中的每一个由与电阻器串联的光电检测器检测。 判定电路具有来自每个光电检测器的输入引脚，以提供数据信号及其平均DC电压代替数据信号的补码作为判决电路的输入。 决策电路输出数据及其平均值。