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    Method and apparatus for communicating a clock signal in a soliton optical transmission system
    1.
    发明授权
    Method and apparatus for communicating a clock signal in a soliton optical transmission system 有权
    用于在孤子光传输系统中传送时钟信号的方法和装置

    公开(公告)号：US06486990B1

    公开(公告)日：2002-11-26

    申请号：US09215547

    申请日：1998-12-18

    申请人： Kim Byron Roberts ,  Hanan Anis ,  Maurice S. O'Sullivan

    发明人： Kim Byron Roberts ,  Hanan Anis ,  Maurice S. O'Sullivan

    IPC分类号： H04J1408

    CPC分类号： H04B10/25077 ,  H04J14/08

    摘要： A sub-harmonic clock signal is provided in a series of soliton optical pulses that are transmitted at a given line rate in a soliton optical transmission system. The line rate defines time slots of equal duration. Each soliton optical pulse in every N time slots is modulated in a manner to make the pulse distinguishable from pulses in other time slots. The frequency of the sub-harmonic clock signal is equal to the line rate divided by N. This technique of providing a clock signal allows simple recovery of the clock signal using a PIN diode photo detector and a bandpass filter of appropriate bandwidth.

    摘要翻译： 在孤子光传输系统中以一定的线速率传输的一系列孤子光脉冲中提供了一个亚谐波时钟信号。 线速率定义相同持续时间的时隙。 每N个时隙中的每个孤子光脉冲以使得脉冲可以与其他时隙中的脉冲区分开的方式进行调制。 子谐波时钟信号的频率等于线速度除以N.这种提供时钟信号的技术允许使用PIN二极管光电检测器和适当带宽的带通滤波器简单恢复时钟信号。

    Optical add/drop multiplexer/demultiplexer
    2.
    发明授权
    Optical add/drop multiplexer/demultiplexer 有权
    光分插复用器/解复用器

    公开(公告)号：US06101012A

    公开(公告)日：2000-08-08

    申请号：US343414

    申请日：1999-06-30

    申请人： David John Danagher ,  Alan G. Solheim ,  Maurice S. O'Sullivan ,  Richard A. Habel ,  Kim Byron Roberts ,  Duncan John Forbes ,  Nigel Baker ,  Ian Hardcastle ,  Takis Hadjifotiou ,  Bipin Patel ,  Giuseppe Bordogna ,  James St. Leger Harley

    发明人： David John Danagher ,  Alan G. Solheim ,  Maurice S. O'Sullivan ,  Richard A. Habel ,  Kim Byron Roberts ,  Duncan John Forbes ,  Nigel Baker ,  Ian Hardcastle ,  Takis Hadjifotiou ,  Bipin Patel ,  Giuseppe Bordogna ,  James St. Leger Harley

    IPC分类号： H04J14/02 ,  H04Q11/00

    CPC分类号： H04J14/0221 ,  H04J14/0212 ,  H04Q11/0005 ,  H04Q2011/0016 ,  H04Q2011/0024 ,  H04Q2011/0039 ,  H04Q2011/0069

    摘要： An add/drop multiplexer/demultiplexer (ADM) for switching, modulating and attenuating optical signals in a fiber optic network employing wavelength division multiplexing (WDM) is disclosed. The ADM is equipped an optical multiplexer for splitting an input WDM signal into individual optical signals, leading to respective 2.times.2 switches. Each switch has another input originating from a plurality of "add lines", and selects one of its inputs to be dropped and the other to continue along a main signal path. The retained signals may be modulated and attenuated prior to being tapped and finally multiplexed together by a WDM multiplexer. The tapped signals are optoelectronically converted and fed back to a controller, preferably a digital signal processor running a software algorithm, which controls the switching, modulation and attenuation. This permits remote control of the ADM functions by encoding instructions for the controller into a low-frequency dither signal that is embedded within the individual optical signals. The ADM can accordingly be instructed to reroute traffic, dynamically equalize or otherwise change optical channel power levels, and add or remove dither, all in real time. A specific optical channel may be reserved for control purposes, allowing a network administrator to "log in" to the ADM to override the controller software algorithm. Optionally, the optical signals can be tapped upon entry to the ADM. A bidirectional ADM can be constructed from two unidirectional ADMs, and may share the same controller. Also, a single, general multi-input multi-output switch can be used to provide an arbitrary mapping between individual input and output optical signals.

    摘要翻译： 公开了一种用于在采用波分复用（WDM）的光纤网络中切换，调制和衰减光信号的分插复用器/解复用器（ADM）。 ADM装备有一个光信号多路复用器，用于将输入的WDM信号分离成各自的光信号，从而产生各自的2x2开关。 每个开关具有源自多个“相加线”的另一个输入，并且选择其一个输入被丢弃，另一个输入沿主信号路径继续。 保留的信号可以在被抽头之前被调制和衰减，并且最终由WDM多路复用器多路复用在一起。 抽头信号被光电转换并反馈到控制器，优选地是运行软件算法的数字信号处理器，其控制开关，调制和衰减。 这允许通过将控制器的指令编码成嵌入各个光信号内的低频抖动信号来远程控制ADM功能。 因此可以指示ADM重新路由业务，动态均衡或以其他方式改变光信道功率级别，并且实时地添加或去除抖动。 可以保留特定的光通道用于控制目的，允许网络管理员“登录”到ADM以覆盖控制器软件算法。 可选地，可以在进入ADM时轻拍光信号。 双向ADM可以由两个单向ADM构建，并且可以共享相同的控制器。 此外，单个一般的多输入多输出开关可用于提供各个输入和输出光信号之间的任意映射。

    Duobinary coding and modulation technique for optical communication systems
    4.
    发明授权
    Duobinary coding and modulation technique for optical communication systems 失效
    光通信系统的二进制编码和调制技术

    公开(公告)号：US5892858A

    公开(公告)日：1999-04-06

    申请号：US827419

    申请日：1997-03-27

    申请人： Mazoud Vaziri ,  Maurice S. O'Sullivan ,  Terry W. B. Taraschuk ,  Alan Glen Solheim ,  Kim Byron Roberts

    发明人： Mazoud Vaziri ,  Maurice S. O'Sullivan ,  Terry W. B. Taraschuk ,  Alan Glen Solheim ,  Kim Byron Roberts

    IPC分类号： G02F1/01 ,  H03M5/16 ,  H03M5/18 ,  H04B10/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04B10/155 ,  H04L25/497 ,  G02B6/10

    CPC分类号： H04B10/5055 ,  H03M5/18 ,  H04B10/505 ,  H04B10/5167

    摘要： A method for encoding a binary input sequence x(0,1) to obtain a duobinary output sequence y(+1,0,-1) is provided. The duobinary coding technique always provides an output bit y.sub.k =0 when the corresponding bit x.sub.k =0; bits y.sub.k alternatively assume a logical level "+1" and "-1" whenever an input bit x.sub.k-1 =0 changes to x.sub.k =1, and the output bit y.sub.k maintains the logical level "+1" or "-1" whenever the corresponding bit x.sub.k maintains the logical level "1". A coding device for encoding a binary input sequence x(0,1) to a duobinary output sequence y(+1,0,-1) is also provided, comprising a D-type flip-flop for generating a binary switch signal. A first AND circuit receives the input sequence and the switch signal, and provides a first binary sequence a(0,1), while a second AND circuit receives the input sequence and the complement of the switch signal and provides a second binary sequence b(0,1). These first and second binary sequences are applied to a summer to obtain the output sequence y(+1,0,-1). A method for differentially driving a M-Z modulator using a virtual ground level is also provided, which reduces the peak-to-peak drive voltage by a factor of two.

    摘要翻译： 提供了一种用于对二进制输入序列x（0,1）进行编码以获得双二进制输出序列y（+ 1,0，-1）的方法。 当对应的位xk = 0时，双向编码技术总是提供输出位yk = 0; 只要输入位xk-1 = 0改变为xk = 1，位yk或者假设逻辑电平“+1”和“-1”，并且输出位yk每当维持逻辑电平“+1”或“-1” 对应的位xk保持逻辑电平“1”。 还提供了用于将二进制输入序列x（0,1）编码到二进制输出序列y（+ 1,0，-1）的编码装置，包括用于产生二进制开关信号的D型触发器。 第一AND电路接收输入序列和开关信号，并提供第一二进制序列a（0,1），而第二AND电路接收输入序列和开关信号的补码，并提供第二二进制序列b（ 0,1）。 将这些第一和第二二进制序列应用于加法器以获得输出序列y（+ 1,0，-1）。 还提供了一种用于使用虚拟接地电平差分驱动M-Z调制器的方法，其将峰 - 峰驱动电压降低了二倍。

    Method of determining optical amplifier failures
    7.
    发明授权
    Method of determining optical amplifier failures 失效
    确定光放大器故障的方法

    公开(公告)号：US6064501A

    公开(公告)日：2000-05-16

    申请号：US788300

    申请日：1997-01-24

    申请人： Kim Byron Roberts ,  Maurice Stephen O'Sullivan ,  Richard A. Habel ,  Christopher Brendan Kennedy

    发明人： Kim Byron Roberts ,  Maurice Stephen O'Sullivan ,  Richard A. Habel ,  Christopher Brendan Kennedy

    IPC分类号： H01S3/10 ,  H04B10/079 ,  H04B10/293 ,  H04B10/08

    CPC分类号： H04B10/2912 ,  H04B10/07955 ,  H04B10/0797 ,  H04B10/2931 ,  H04B10/2971 ,  H04B2210/08

    摘要： The invention is directed to a failure detection system and method for detecting malfunction of an optical amplifier module with one or multiple transmission channels. The failure detection system comprises a unit for measuring a performance parameter of the module; a unit for providing an expected performance parameter; and a comparator unit for receiving the performance parameter and the expected performance parameter and producing an error signal when the performance parameter substantially departs from the expected performance parameter. The system also includes a display/alarm unit for receiving the error signal and accordingly signaling failure of the module. The performance parameter is an output value of the module; a correspondence between an output value and an input value for a transmission channel; a figure of merit (FOM.sup.t=t); a set of gains (g) for all transmission channels; and the dynamic range of the amplifier module.

    摘要翻译： 本发明涉及一种用于检测具有一个或多个传输信道的光放大器模块的故障的故障检测系统和方法。 故障检测系统包括用于测量模块的性能参数的单元; 用于提供预期性能参数的单元; 以及比较器单元，用于在性能参数基本上偏离预期性能参数时接收性能参数和预期性能参数并产生误差信号。 该系统还包括一个显示/报警单元，用于接收错误信号并相应地发出模块信号故障。 性能参数是模块的输出值; 传输信道的输出值和输入值之间的对应关系; 一个品质因数（FOMt = t）; 所有传输通道的一组增益（g）; 和放大器模块的动态范围。

    Stable power control for optical transmission systems
    9.
    发明授权
    Stable power control for optical transmission systems 有权
    光传输系统的稳定功率控制

    公开(公告)号：US06268945B1

    公开(公告)日：2001-07-31

    申请号：US09458209

    申请日：1999-12-09

    申请人： Kim Byron Roberts

    发明人： Kim Byron Roberts

    IPC分类号： H04B1008

    CPC分类号： H04B10/505 ,  H04B10/503 ,  H04B10/506 ,  H04B10/564 ,  H04J14/0221

    摘要： In an optical transmission system, an optical signal is transmitted to an optical element which is sensitive to changes in the optical power of the signal. Changes in optical power are anticipated and damped by controlling the transmitter output power, or an external damping element. For WDM systems, wavelengths can be added or removed without causing rapid changes in total power which would otherwise disturb the output of downstream optical amplifiers, and cause bit errors.

    摘要翻译： 在光传输系统中，光信号被传输到对信号的光功率变化敏感的光学元件。 通过控制发射机输出功率或外部阻尼元件，可以预期和抑制光功率的变化。 对于WDM系统，可以添加或去除波长，而不会导致总功率的快速变化，否则会干扰下游光放大器的输出，并导致位错误。

    Optical fibre transmission systems
    10.
    发明授权
    Optical fibre transmission systems 失效
    光纤传输系统

    公开(公告)号：US06252692B1

    公开(公告)日：2001-06-26

    申请号：US08660565

    申请日：1996-06-07

    申请人： Kim Byron Roberts

    发明人： Kim Byron Roberts

    IPC分类号： H04B1018

    CPC分类号： H04B10/2513

    摘要： An optical transmission system includes means for measuring optical dispersion in the optical path, and a controllable element such as a dispersion compensator, operable in dependence on the measured value of dispersion. A low frequency dither on the optical signal causes timing jitter which varies according to the dispersion in the optical path. The timing jitter is extracted from a clock signal recovered from the optical signal. This jitter is correlated with the original dither to remove jitter effects caused by other mechanisms. Thus a value for dispersion is derived which can be used for monitoring or control purposes.

    摘要翻译： 光传输系统包括用于测量光路中的光学色散的装置，以及可根据色散的测量值操作的可调节元件，例如色散补偿器。 在光信号上的低频抖动导致定时抖动，其根据光路中的色散而变化。 从从光信号恢复的时钟信号中提取定时抖动。 这种抖动与原始抖动相关，以消除由其他机制引起的抖动效应。 因此，导出可用于监视或控制目的的色散值。