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1. 发明授权

US06381385B1 Polarization mode dispersion emulation 失效
标题翻译：极化模式色散仿真
公开(公告)号：US06381385B1
公开(公告)日：2002-04-30
申请号：US09470628
申请日：1999-12-22
申请人： Daniel A Watley , Richard Epworth , Alan Robinson
发明人： Daniel A Watley , Richard Epworth , Alan Robinson
IPC分类号： G02B600
CPC分类号： G02B6/274 , G02B6/02071 , G02B6/105 , G02B6/278 , H04B10/2572
摘要： A PMD (polarisation mode dispersion) emulator which provides at least first and second order emulation of PMD effects observed in fiber installed in the field consists of a small number of concatenated lengths of high birefringence fiber having an appropriate distribution of relative DGDs (differential group delays), and connected with random relative orientation. Varying some parameter, such as temperature distribution, allows the emulator to provide accelerated exploration of random fluctuations in PMD which, in the field, may require many weeks, or longer, to observe.
摘要翻译：提供在场中安装的光纤中观察到的PMD效应的至少第一和第二阶仿真的PMD（偏振模色散）仿真器包括具有适当分布的相对DGD（差分组延迟）的少量连续长度的高双折射光纤），并与随机相对取向相关联。改变诸如温度分布的一些参数，允许模拟器对PMD中的随机波动进行加速探索，在现场可能需要多周或更长时间来观察。

2. 发明授权

US07209670B2 Polarization diversity receiver for optical transmission system 有权
标题翻译：光传输系统的极化分集接收机
公开(公告)号：US07209670B2
公开(公告)日：2007-04-24
申请号：US10425810
申请日：2003-04-29
申请人： Christopher Fludger , Richard Epworth , Alan Robinson
发明人： Christopher Fludger , Richard Epworth , Alan Robinson
IPC分类号： H04B10/06 , H04B10/156
CPC分类号： H04B10/2569 , H04B10/67 , H04B10/69
摘要： A polarization diversity receiver has an optical section for converting the received optical signal into four or five polarization diverse component optical signals that substantially represent amplitude and polarization state information of the received optical signal, by respective polarization transformations to respective points on a Poincaré sphere, the points being equally spaced apart to maximize polarization diversity, even in the worst case input polarization state. Detectors produce component electrical signals from each of the component optical signals, for electronic processing to compensate for PMD. By reducing the number of component optical signals significant cost and size reductions are enabled. The need for precise polarization tracking in the receiver can be reduced or eliminated completely. Balanced detectors can be used to reduce the number of electrical signals. The electrical processing can use sequence detection.
摘要翻译：偏振分集接收机具有光学部分，用于通过相应的极化转换到Poincaré球上的各个点，将接收的光信号转换成基本上表示接收的光信号的振幅和偏振状态信息的四或五个偏振分量分量光信号，即使在最差情况下输入极化状态，点间距相等以最大化极化分集。检测器从每个分量光信号产生分量电信号，用于电子处理以补偿PMD。通过减少组件光信号的数量，可以显着降低成本和尺寸。在接收机中对精确的极化跟踪的需要可以被完全减少或消除。平衡检测器可用于减少电信号的数量。电气处理可以使用序列检测。

3. 发明授权

US07580630B2 Spectral shaping for optical OFDM transmission 失效
标题翻译：用于光OFDM传输的光谱整形
公开(公告)号：US07580630B2
公开(公告)日：2009-08-25
申请号：US10940459
申请日：2004-09-14
申请人： Huai Kee , Richard Epworth , Alan Robinson , Robin Rickard
发明人： Huai Kee , Richard Epworth , Alan Robinson , Robin Rickard
IPC分类号： H04J14/00 , H04B10/08 , H04B10/04
CPC分类号： H04B10/2543 , H04B10/548 , H04B10/58
摘要： A transmitter for an optical transmission system transmits an optical sub carrier multiplexed signal comprising number of sub-carriers, onto an optical transmission path, and provides spectral shaping by different magnitudes of the sub-carriers, or different modulation formats for different sub carriers. This spectral shaping can reduce performance degradation by Kerr effect optical non linearities. This can mean higher input powers may be launched. The magnitudes can provide a signal spectrum which is lower near a center of a band of sub carriers than near an edge of the band. Such spectral shaping can be provided in the receiver either to undo the pre emphasis in the transmitter, or to reduce non linearities from components at the receiving side.
摘要翻译：用于光传输系统的发射机将包括多个子载波的光副载波复用信号发送到光传输路径上，并且通过不同幅度的子载波或不同子载波的不同调制格式提供频谱整形。这种频谱整形可以通过克尔效应光学非线性来降低性能下降。这可能意味着可能会启动更高的输入功率。幅度可以提供在子载波带的中心附近比带的边缘附近较低的信号频谱。可以在接收机中提供这样的频谱整形以消除发射机中的预加重，或者减少来自接收侧的组件的非线性。

4. 发明申请

US20050271387A1 Spectral shaping for optical OFDM transmission 失效
标题翻译：用于光OFDM传输的光谱整形
公开(公告)号：US20050271387A1
公开(公告)日：2005-12-08
申请号：US10940459
申请日：2004-09-14
申请人： Huai Kee , Richard Epworth , Alan Robinson , Robin Rickard
发明人： Huai Kee , Richard Epworth , Alan Robinson , Robin Rickard
IPC分类号： H04B10/00 , H04B10/155 , H04B10/18
CPC分类号： H04B10/2543 , H04B10/548 , H04B10/58
摘要： A transmitter for an optical transmission system transmits an optical sub carrier multiplexed signal comprising number of sub-carriers, onto an optical transmission path, and provides spectral shaping by different magnitudes of the sub-carriers, or different modulation formats for different sub carriers. This spectral shaping can reduce performance degradation by Kerr effect optical non linearities. This can mean higher input powers may be launched. The magnitudes can provide a signal spectrum which is lower near a centre of a band of sub carriers than near an edge of the band. Such spectral shaping can be provided in the receiver either to undo the pre emphasis in the transmitter, or to reduce non linearities from components at the receiving side.
摘要翻译：用于光传输系统的发射机将包括多个子载波的光副载波复用信号发送到光传输路径上，并且通过不同幅度的子载波或不同子载波的不同调制格式提供频谱整形。这种频谱整形可以通过克尔效应光学非线性来降低性能下降。这可能意味着可能会启动更高的输入功率。幅度可以提供在子载波带的中心附近比带的边缘附近较低的信号频谱。可以在接收机中提供这样的频谱整形以消除发射机中的预加重，或者减少来自接收侧的组件的非线性。

5. 发明授权

US06526208B1 Dispersion managed fiber optic cable and system 有权
标题翻译：色散管理光缆和系统
公开(公告)号：US06526208B1
公开(公告)日：2003-02-25
申请号：US09723018
申请日：2000-11-27
申请人： Jonathan King , Richard Epworth , Marco Cavallari , Alan Robinson , Benoit Charbonnier
发明人： Jonathan King , Richard Epworth , Marco Cavallari , Alan Robinson , Benoit Charbonnier
IPC分类号： G02B616
CPC分类号： G02B6/29376 , H04B10/25253
摘要： A hybrid optical fiber comprises a first fiber section comprising a fiber or a concatenation of fibers having first dispersion characteristics at a predetermined operating wavelength and a second fiber section coupled to the first fiber section to form the hybrid fiber. The first fiber dispersion characteristics are selected to maintain the signal dispersion within desired limits, whereas the second fiber is optimised for low loss. Dispersion compensation is provided in the first section of the fiber span where the signal intensity is highest, and therefore the region of the fiber span where these non-linearities have greatest effect. In the second section of the fiber span, the non-linear effects can be ignored, so it is optimised for low loss rather than for dispersion compensation.
摘要翻译：混合光纤包括第一纤维部分，其包括纤维或具有预定工作波长的第一分散特性的纤维级联和与第一纤维部分耦合以形成混合纤维的第二纤维部分。选择第一光纤色散特性以将信号色散保持在期望的限度内，而第二光纤针对低损耗进行优化。在信号强度最高的光纤跨段的第一部分中提供色散补偿，因此在这些非线性具有最大效果的光纤跨度的区域中提供色散补偿。在光纤跨度的第二部分，非线性效应可以忽略，因此它针对低损耗而不是色散补偿进行了优化。

6. 发明授权

US06847769B1 Optical fiber amplifier 失效
标题翻译：光纤放大器
公开(公告)号：US06847769B1
公开(公告)日：2005-01-25
申请号：US09739529
申请日：2000-12-15
申请人： Alan Robinson , Jonathan King , Stephen Wilson
发明人： Alan Robinson , Jonathan King , Stephen Wilson
IPC分类号： H01S3/067 , G02B6/16
CPC分类号： H01S3/06708
摘要： An optical amplifier comprises a doped fiber core and a cladding layer surrounding the core. The mode field diameter of the fiber is greater than 8 μm and the refractive index difference between the core and the cladding layer is selected such that the cut-off wavelength at which the fiber becomes single mode lies in the range 1000-1550 nm. This amplifier uses a large made field diameter fiber, which reduces the intensity for a specified output power. This results in reduced filtering of the low frequency components of the signal. The refractive index difference between the core and cladding is selected such that the fiber is multi-mode at 980 nm, which enables bend performance to be improved.
摘要翻译：光放大器包括掺杂光纤芯和围绕芯的包覆层。纤维的模场直径大于8μm，并且选择芯和包层之间的折射率差，使得光纤变成单模的截止波长在1000-1550nm的范围内。该放大器使用大的制造的直径光纤，这降低了指定输出功率的强度。这导致信号的低频分量的滤波减少。芯和包层之间的折射率差被选择为使得光纤在980nm处是多模的，这使得能够改善弯曲性能。

7. 发明授权

US06459533B1 Tuneable optical filters 有权
标题翻译：可调光学滤光片
公开(公告)号：US06459533B1
公开(公告)日：2002-10-01
申请号：US09603080
申请日：2000-06-26
申请人： Terry V Clapp , Alan Robinson
发明人： Terry V Clapp , Alan Robinson
IPC分类号： G02B2700
CPC分类号： G02F1/1326 , G02B2006/12107 , G02B2006/12164 , G02F1/011 , G02F1/0147 , G02F2201/307
摘要： An optical waveguide format tuneable optical filter is formed using Bragg grating reflectors to define one or more optical cavities of a Fabry Pérot etalon, the or each cavity of the etalon including one or more slots containing a controllable refractive index medium, for instance a silicone gel whose index is regulated by Joule heating, or a polymer dispersed liquid crystal whose index is electric field regulated. Strong coupling coefficient (˜ a few tens mm−1) gratings may be made using lithography to form linear arrays of buried high index inclusions extending along the waveguide core axis.
摘要翻译：使用布拉格光栅反射器形成光波导格式的可调谐光学滤波器以限定法布里标准具的一个或多个光学腔，标准具的每个空腔包括一个或多个包含可控折射率介质的槽，例如硅胶其指数由焦耳加热调节，或指数为电场调节的聚合物分散液晶。可以使用光刻法形成强耦合系数（〜几十mm -1）的光栅，以形成沿着波导芯轴延伸的埋藏的高折射率夹杂物的线性阵列。

8. 发明授权

US6124960A Transmission system with cross-phase modulation compensation 失效
标题翻译：具有交叉相位调制补偿的传输系统
公开(公告)号：US6124960A
公开(公告)日：2000-09-26
申请号：US929360
申请日：1997-09-08
申请人： Dietmar Garthe , Ross Alexander Saunders , Alan Robinson , Maurice O'Sullivan , Rongqing Hui
发明人： Dietmar Garthe , Ross Alexander Saunders , Alan Robinson , Maurice O'Sullivan , Rongqing Hui
IPC分类号： G02F1/01 , H04B3/06 , H04B10/02 , H04B10/18 , H04B10/04
CPC分类号： H04B10/25137 , H04B10/255 , H04B10/2557
摘要： In a WDM transmission system carrying amplitude modulated traffic in which significant cross-phase modulation occurs, each of the individual channels is pre-chirped at the transmitter with replicas, or low-pass filtered replicas of the amplitude modulation applied to each of the other channels. Prechirping of each individual channel with a replica of the amplitude modulation applied to that channel may be added in order additionally to provide compensation for self-phase modulation.
摘要翻译：在承载幅度调制业务的WDM传输系统中，发生显着的跨相位调制，各个信道在发射机处被预先啁啾，其中复制或低通滤波后的复制品被施加到每个其它信道。每个单独信道的预加速可以应用于该信道的幅度调制的复制品，以便额外地添加以对自相位调制提供补偿。

9. 发明授权

US5949560A Optical transmission system 失效
标题翻译：光传输系统
公开(公告)号：US5949560A
公开(公告)日：1999-09-07
申请号：US795684
申请日：1997-02-05
申请人： Kim Byron Roberts , Alan Robinson , Richard Edward Epworth , Henry John Harvey
发明人： Kim Byron Roberts , Alan Robinson , Richard Edward Epworth , Henry John Harvey
IPC分类号： G01M11/02 , H04B3/46 , H04B10/02 , H04B10/08 , H04B10/135 , H04B10/18 , H04B10/00
CPC分类号： H04B10/2572 , H04B10/07951 , H04B10/2569
摘要： An Optical Transmission System includes a monitor for outputting monitored data representative of the extent to which an optical signal is degraded by polarization mode dispersion. The monitor measures the degree of depolarization present in a sample of the optical signal derived from an optical tap, the depolarization being associated with polarization variation at the bit rate frequency of a signal data stream carried by the optical signal. The monitored data is used to control operation of the system to reroute the optical path taken by the optical signal in the event of a threshold level of polarization mode dispersion being exceeded. A transmitter of the optical signal may also be controlled to minimize polarization mode dispersion by varying the polarization state of the optical signal at launch so as to reduce the measured monitor data. The monitor functions during normal transmission of optical signals without the need for shutting down links of the system for measurement purposes. The invention has particular application to long haul optical transmissions of data streams at 10 Gb/sec or more.
摘要翻译：光传输系统包括用于输出表示通过偏振模色散使光信号劣化程度的监视数据的监视器。监视器测量从光学抽头导出的光学信号的样本中存在的去极化程度，去极化与由光信号携带的信号数据流的比特率频率处的偏振变化相关联。所监视的数据用于控制在超过极化模式色散的阈值水平的情况下系统重新路由由光信号拍摄的光路的操作。也可以通过改变发射时的光信号的偏振状态来控制光信号的发射器，以使偏振模色散最小化，从而减少测量的监视数据。监视器在光信号的正常传输期间起作用，而不需要关闭系统的链路用于测量目的。本发明特别适用于10Gb /秒以上的数据流的长距离光传输。

10. 发明授权

US07558479B1 Analysis and control of optical communications systems 有权
标题翻译：光通信系统的分析与控制
公开(公告)号：US07558479B1
公开(公告)日：2009-07-07
申请号：US10825542
申请日：2004-04-15
申请人： Alan Robinson
发明人： Alan Robinson
IPC分类号： H04B10/08 , H04B10/00
CPC分类号： H04B10/0795 , H04B10/25137 , H04B10/2543 , H04B2210/252 , H04B2210/254
摘要： An optical communications system has a plurality of spans between a transmitter and a receiver. The receiver has optical to electrical conversion circuitry for converting the received optical signal to an electric signal, analogue to digital conversion circuitry and digital signal processing means for analysing the electrical digital signal. The digital signal processing means derives information concerning characteristics of individual spans from the electrical digital signal. This enables parameters such as per-span variations in provisioned power, local dispersion and span loss to be measured. In-service measurements of system characteristics can be used to enable optimisation of the network operation.
摘要翻译：光通信系统在发射机和接收机之间具有多个跨度。接收器具有用于将接收到的光信号转换成电信号的光电转换电路，用于分析电数字信号的模数转换电路和数字信号处理装置。数字信号处理装置从电数字信号中得出关于各个跨度的特性的信息。这使得可以测量诸如每次跨度变化的参数，局部色散和跨度损失等参数。可以使用系统特性的在线测量来实现网络操作的优化。

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