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1. 发明授权

US5900968A Method of fast gain control in WDM optical networks 失效
标题翻译： WDM光网络快速增益控制方法
公开(公告)号：US5900968A
公开(公告)日：1999-05-04
申请号：US728629
申请日：1996-10-10
申请人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , Robert William Tkach , John Lehrer Zyskind
发明人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , Robert William Tkach , John Lehrer Zyskind
IPC分类号： H04B10/04 , H04B10/06 , H04B10/14 , H04B10/17 , H04J14/02 , H01S3/00
CPC分类号： H04B10/296 , H04B10/2912 , H04B10/2935 , H04J14/0221
摘要： In a WDM network employing a plurality of optical amplifiers in at least one optical fiber link, a system and method for dynamically controlling gain in accordance with the collective behavior of the amplifier chain. According to the present invention, the required response time of dynamic gain control is selected substantially inversely relative to the number of amplifiers in the communication path. Illustratively, in a large-scale optical network (with signal channel paths traversing say, a hundred optical amplifiers), the response time of gain control in accordance with the present invention may be on the order of 5 .mu.s or even less.
摘要翻译：在至少一个光纤链路中使用多个光放大器的WDM网络中，根据放大器链的集体行为来动态地控制增益的系统和方法。根据本发明，动态增益控制的所需响应时间相对于通信路径中的放大器的数量基本上相反地选择。说明性地，在大规模光网络（具有通过数百个光放大器的信道通道）中，根据本发明的增益控制的响应时间可以在5μs甚至更小的数量级。

2. 发明授权

US06671466B1 Distortion compensation in optically amplified lightwave communication systems 失效
标题翻译：光放大光波通信系统中的失真补偿
公开(公告)号：US06671466B1
公开(公告)日：2003-12-30
申请号：US09357228
申请日：1999-07-20
申请人： Sonali Banerjee , Atul Kumar Srivastava , James William Sulhoff , Yan Sun
发明人： Sonali Banerjee , Atul Kumar Srivastava , James William Sulhoff , Yan Sun
IPC分类号： H04J1402
CPC分类号： H04B10/296
摘要： Distortion and crosstalk that occurs when operating optical amplifiers in saturation is substantially reduced by passively compensating for gain variations caused by changes in input power to the optical amplifiers. More specifically, in an optical communication system having one or more optical amplifiers, a “reservoir” optical channel is supplied in addition to the other traffic-carrying optical channels. The wavelength of the reservoir channel is selected such that the power level of the reservoir channel varies in response to changes in power levels of the traffic-carrying channels. Because gain variations are typically highest around the gain peak region in an optical amplifier's gain bandwidth, the reservoir channel in one exemplary embodiment is assigned a wavelength around the gain peak region. As such, the reservoir channel can absorb or otherwise receive most of the distortion and crosstalk while the traffic-carrying channels located away from the gain peak region will experience less distortion and crosstalk. -Importantly, this passive compensation scheme can be used in an amplified system which is operating in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk.
摘要翻译：通过被动地补偿由光放大器的输入功率变化引起的增益变化，实质上减少了在饱和状态下操作光放大器时发生的失真和串扰。更具体地说，在具有一个或多个光放大器的光通信系统中，除了其它运载光信道之外还提供“储存器”光信道。选择储层通道的波长，使得储层通道的功率水平响应于运载通道的功率水平的变化而变化。由于增益变化通常在光放大器的增益带宽中的增益峰值区域附近最高，所以在一个示例性实施例中的储层通道被分配在增益峰值区域周围的波长。因此，储存通道可以吸收或以其他方式接收大部分失真和串扰，而远离增益峰值区域的业务承载信道将经历较少的失真和串扰。 - 重要的是，这种无源补偿方案可以用在放大系统中，放大系统在存在由增益变化（如模态间失真和饱和感应串扰）引起的非线性失真的情况下工作。

3. 发明授权

US06602002B1 High capacity optical transmission arrangement 有权
标题翻译：高容量光传输布置
公开(公告)号：US06602002B1
公开(公告)日：2003-08-05
申请号：US09253279
申请日：1999-02-19
申请人： Atul Kumar Srivastava , James William Sulhoff , Yan Sun , John Lehrer Zyskind
发明人： Atul Kumar Srivastava , James William Sulhoff , Yan Sun , John Lehrer Zyskind
IPC分类号： H04B1000
CPC分类号： H04B10/506 , H04B10/2941
摘要： A high-capacity optical transmission arrangement utilizing a plurality of laser sources and a plurality of wide-band optical amplifiers permit the reliable transmission of 1 Tb/sec rates over significant distances of optical fiber.
摘要翻译：利用多个激光源和多个宽带光放大器的大容量光传输装置允许在光纤的显着距离上可靠地传输1Tb / sec的速率。

4. 发明授权

US6049417A Wide band optical amplifier 失效
标题翻译：宽带光放大器
公开(公告)号：US6049417A
公开(公告)日：2000-04-11
申请号：US79938
申请日：1998-05-15
申请人： Atul Kumar Srivastava , James William Sulhoff , Yan Sun , John Lehrer Zyskind
发明人： Atul Kumar Srivastava , James William Sulhoff , Yan Sun , John Lehrer Zyskind
IPC分类号： H01S3/067 , H01S3/23 , H04B10/17 , H01S3/00
CPC分类号： H04B10/2941 , H01S3/06754 , H01S2301/04 , H01S2301/06 , H01S3/2383 , H04B2210/258
摘要： A wide band optical amplifier employing a split-band architecture in which an optical signal is split into several independent sub-bands which then pass in parallel through separate branches of the optical amplifier. Each branch may be optimized for the sub-band that traverses it. The independent sub-bands are combined before output, resulting in a broad band, high efficiency amplifier. Alternative, hybrid split-band amplifiers are described. As a result of their desirable characteristics, these wide band optical amplifiers may be used in dense WDM communications systems.
摘要翻译：采用分波段结构的宽带光放大器，其中光信号被分成几个独立的子带，然后它们通过光放大器的分开的分支并行通过。每个分支可以针对穿过它的子带进行优化。独立的子带在输出之前被组合，产生宽带，高效放大器。描述了替代的混合分离放大器。作为其期望特性的结果，这些宽带光放大器可以用在密集WDM通信系统中。

5. 发明授权

US06473212B1 Lightwave communication systems using semiconductor optical amplifiers 有权
标题翻译：使用半导体光放大器的光波通信系统
公开(公告)号：US06473212B1
公开(公告)日：2002-10-29
申请号：US09253259
申请日：1999-02-19
申请人： Andrew Roman Chraplyvy , Robert Meachem Jopson , Atul Kumar Srivastava , James William Sulhoff , Yan Sun
发明人： Andrew Roman Chraplyvy , Robert Meachem Jopson , Atul Kumar Srivastava , James William Sulhoff , Yan Sun
IPC分类号： H04J1402
CPC分类号： H04B10/296 , H04B10/2914
摘要： Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit “0”, and a minimum power level associated with a second bit value, e.g., bit “1”. Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to PTOTAL/2N, where PTOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal. According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the total effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.
摘要翻译：在包括光放大器的光通信系统中实现基本无差错的通信，所述光通信系统使用检测阈值来检测放大的光信号中发送的位，所述检测阈值作为与第一位值相关联的最大功率电平的函数导出，例如位 “0”，以及与第二位值相关联的最小功率电平，例如位“1”。重要的是，即使存在由诸如模态间失真和饱和感应串扰的增益变化引起的非线性失真，该检测方案也可用于精确地检测放大信号中的位模式。在包括半导体光放大器的波分复用（WDM）系统中，例如，检测阈值可以被设置在与PTOTAL / 2N相对应的电平，其中PTOTAL表示WDM信号中的总功率，N表示光信道数在WDM信号中。根据本发明的另一方面，增益波动的效果随着信道数量的增加而变小。特别地，当增益变化随着通道数量的增加而减小时，实现总有效饱和功率的平滑效果。因此，根据本发明原理的半导体光放大器的性能随着信道数量的增加而接近光纤放大器的线性性能。

6. 发明授权

US6049418A Noise figure in optical amplifiers with a split-band architecture 失效
标题翻译：具有分频架构的光放大器的噪声系数
公开(公告)号：US6049418A
公开(公告)日：2000-04-11
申请号：US89863
申请日：1998-06-03
申请人： Atul Kumar Srivastava , James William Sulhoff , Yan Sun , Paul Francis Wysocki
发明人： Atul Kumar Srivastava , James William Sulhoff , Yan Sun , Paul Francis Wysocki
IPC分类号： H01S3/067 , H01S3/16 , H01S3/23 , H01S3/00
CPC分类号： H01S3/06754 , H01S3/0675 , H01S3/06766 , H01S3/0677 , H01S3/1608 , H01S3/2383 , H04B2210/258
摘要： A wideband optical amplifier employs split-band architecture in which an optical signal passes through a common amplification stage and is then split to pass through parallel gain stages, each of which may be optimized for a particular band being traversed. A broadband grating reflector is used after the input gain section to reflect the signals of one of the bands so that they again will pass through the common input gain section before passing through gain section of the split structure dedicated to their particular wavelength. Meanwhile, the other signals pass through the reflector and move on through the gain section pertinent to their wavelength.
摘要翻译：宽带光放大器采用分波段结构，其中光信号通过公共放大级，然后被分割以通过并行增益级，其中的每一级可以针对被遍历的特定频带进行优化。在输入增益部分之后使用宽带光栅反射器以反射其中一个频带的信号，使得它们在通过专用于其特定波长的分割结构的增益部分之前再次通过公共输入增益部分。同时，其他信号通过反射器并且通过与它们的波长有关的增益部分。

7. 发明授权

US6049416A Erbium-doped fiber amplifiers with desired gain-bandwidth characteristics 失效
标题翻译：具有所需增益带宽特性的掺铒光纤放大器
公开(公告)号：US6049416A
公开(公告)日：2000-04-11
申请号：US16479
申请日：1998-01-30
申请人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , John Lehrer Zyskind
发明人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , John Lehrer Zyskind
IPC分类号： H01S3/10 , H01S3/16 , H04B10/17 , H01S3/00 , G01N21/17
CPC分类号： H04B10/2941 , H01S3/10023 , H01S2301/04 , H01S3/1608
摘要： A method for determining the optimal design of a gain equalization filter (GEF) used in optical fiber amplifiers. The method is suitable for erbium-doped fiber amplifiers (EDFA) that are widely used in wavelength-division-multiplexed (WDM) optical communication systems and networks.
摘要翻译：一种用于确定在光纤放大器中使用的增益均衡滤波器（GEF）的最佳设计的方法。该方法适用于广泛应用于波分复用（WDM）光通信系统和网络的掺铒光纤放大器（EDFA）。

8. 发明授权

US5900969A Broadband flat gain optical amplifier 失效
标题翻译：宽带平面增益光放大器
公开(公告)号：US5900969A
公开(公告)日：1999-05-04
申请号：US800870
申请日：1997-02-14
申请人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , Jianhui Zhou , John Lehrer Zyskind
发明人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , Jianhui Zhou , John Lehrer Zyskind
IPC分类号： H01S3/10 , H01S3/06 , H01S3/094 , H04B10/16 , H04B10/17 , H04J14/00 , H04J14/02 , H01S3/00
CPC分类号： H04B10/2912 , H04B10/291 , H04B10/2941 , H01S3/09408 , H04B2210/003
摘要： An optical amplifier that receives an optical signal at an input of the optical amplifier is arranged so that it amplifies the signal and then adjusts the level of the amplified input signal to a predetermined level. The optical amplifier, which includes a filter to substantially decrease the wavelength dependence of the optical amplifier, then amplifies the adjusted signal and supplies the resulting signal to an output.
摘要翻译：在光放大器的输入处接收光信号的光放大器被布置成使其放大信号，然后将放大的输入信号的电平调整到预定电平。包括滤波器以大大降低光放大器的波长依赖性的光放大器然后放大调整后的信号并将所得信号提供给输出。

9. 发明授权

US6025941A Stable wavelength division multiplex ring network 失效
标题翻译：稳定的波分复用环网
公开(公告)号：US6025941A
公开(公告)日：2000-02-15
申请号：US929926
申请日：1997-09-15
申请人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , John Lehrer Zyskind
发明人： Atul Kumar Srivastava , James W. Sulhoff , Yan Sun , John Lehrer Zyskind
IPC分类号： H04B10/02 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/18 , H04B10/20 , H04J14/02 , H04B10/08 , H04J14/00
CPC分类号： H04J14/0291 , H04J14/0221 , H04J14/0241 , H04J14/0283 , H04J14/0201 , H04J14/0227
摘要： We have recognized that in a Wavelength Division Multiplex (WDM) ring network with a closed loop, the possibility of lasing at Amplified Spontaneous Emissions (ASE) wavelengths exists. In accordance with the present invention, we provide a technique for protecting against lasing in a WDM ring network comprising a plurality of serially connected node links, each node link including a segment of optical fiber and an access node site for adding or dropping one or more active wavelength channels to a transmission bandwidth of the network. The protection means changes the optical transmission characteristics of the transmission bandwidth of the network to ensure that the network loop gain at any wavelength is always less than the network loop loss.
摘要翻译：我们已经认识到，在具有闭环的波分复用（WDM）环网中，存在放大自发辐射（ASE）波长的可能性。根据本发明，我们提供了一种用于在包括多个串行连接的节点链路的WDM环网中防止引发激光的技术，每个节点链路包括一段光纤和用于添加或丢弃一个或多个有源波长信道到网络的传输带宽。保护装置改变网络的传输带宽的光传输特性，以确保任何波长的网络环路增益始终小于网络环路损耗。

10. 发明授权

US06501870B1 System and method for reducing effects of optical impairments in optically amplified lightwave communication systems 有权
标题翻译：用于减少光放大光波通信系统中的光损伤的影响的系统和方法
公开(公告)号：US06501870B1
公开(公告)日：2002-12-31
申请号：US09518301
申请日：2000-03-03
申请人： Sonali Banerjee , Atul Kumar Srivastava , Yan Sun
发明人： Sonali Banerjee , Atul Kumar Srivastava , Yan Sun
IPC分类号： G02B628
CPC分类号： H04B10/2935 , H04B10/2537
摘要： The effects of optical impairments on optical signal transmission are substantially reduced in a lightwave transmission system by positioning optical amplifiers and network elements in respective upstream-downstream combinations. By placing an optical amplifier at a position upstream from its corresponding network element, sufficient amplification can be provided by the optical amplifier to compensate for losses introduced by its corresponding network element. Advantageously, the corresponding downstream network element provides sufficient attenuation of the forward travelling lightwave signals so that power-dependent nonlinear effects in the optical fiber do not significantly distort the lightwave signals. Moreover, because of the downstream location of the network element in relation to its corresponding network element, the network element substantially suppresses backward travelling optical signal components such as those caused by Rayleigh backscattering, Stimulated Brillioun Scattering (SBS), and the like. As such, the network element prevents unwanted back reflections and back scattered signals from affecting operation of its corresponding optical amplifier.
摘要翻译：通过将光放大器和网络元件定位在相应的上游 - 下游组合中，光学损伤对光信号传输的影响在光波传输系统中显着降低。通过将光放大器放置在其相应网元上游的位置处，光放大器可以提供足够的放大以补偿由其对应的网元引入的损耗。有利地，相应的下游网络元件提供前向行进的光波信号的足够衰减，使得光纤中的功率相关非线性效应不会使光波信号显着失真。此外，由于网元相对于其对应的网元的下游位置，网元基本上抑制了由瑞利后向散射，刺激亮度散射（SBS）等引起的反向行进光信号分量。因此，网络元件防止不必要的反射反射和反向散射的信号影响其对应的光放大器的操作。

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