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    • 2. 发明授权
    • Method and system for equalizing PMD using incremental delay switching
    • 使用增量延迟切换来均衡PMD的方法和系统
    • US5822100A
    • 1998-10-13
    • US670686
    • 1996-06-26
    • Andrew Niall RobinsonJohn A. Fee
    • Andrew Niall RobinsonJohn A. Fee
    • H04B10/18H04B10/00
    • H04B10/2569
    • A polarization mode compensation system and method using optical switch elements to establish incremental delays between different polarization modes of an optical data signal is provided. A polarization mode separator separates the optical data signal into first and second orthogonally polarized optical signals. A first variable switching delay element provides a first incremental propagation delay for the first polarized optical signal. A second variable switching delay element provides a second incremental propagation delay for the second polarized optical signal. The first and second variable switching delay elements consist of a series of optical switches optically interconnected by different incremental lengths of optical fiber. For example, 2.times.2 optical switches are provided for switching between a reference fiber segment and a respective delay fiber segment to provide a relative incremental propagation delay. A controller controls optical switches in the first and second variable switching delay elements to set first and second incremental propagation delays. In particular, the first and second polarized optical signals are incrementally delayed relative to one another so as to compensate for polarization mode dispersion. A beam combiner then combines the first and second polarized optical signals to form an optical output data signal which can be detected accurately by a receiver without the effects of polarization mode dispersion. In this way, optical data signals can be reliably transmitted over greater distances along a long-haul fiber optic dispersive medium at even greater bit-rates and bandwidth.
    • 提供了使用光开关元件在光数据信号的不同偏振模式之间建立增量延迟的偏振模补偿系统和方法。 偏振模式分离器将光学数据信号分离为第一和第二正交偏振光信号。 第一可变切换延迟元件为第一偏振光信号提供第一增量传播延迟。 第二可变切换延迟元件为第二偏振光信号提供第二增量传播延迟。 第一和第二可变开关延迟元件由一系列由不同增量长度的光纤互连的光学开关组成。 例如,提供2x2个光开关用于在参考光纤段和相应的延迟光纤段之间切换以提供相对增量的传播延迟。 控制器控制第一和第二可变切换延迟元件中的光开关以设定第一和第二增量传播延迟。 特别地,第一和第二偏振光信号相对于彼此递增地延迟,以补偿偏振模色散。 然后,光束组合器组合第一和第二偏振光信号以形成光输出数据信号,其可以由接收器精确地检测,而不会产生偏振模色散的影响。 以这种方式,光学数据信号可以以更高的比特率和带宽沿着长距离的光纤色散介质在更远的距离上被可靠地传输。
    • 3. 发明授权
    • Bi-directional all-optical regenerator
    • 双向全光回热器
    • US06317232B1
    • 2001-11-13
    • US09047637
    • 1998-03-25
    • John A. FeeAndrew Niall Robinson
    • John A. FeeAndrew Niall Robinson
    • H04J1402
    • H04B10/2971H04B10/299H04L7/0075
    • An all-optical system for regenerating a first optical signal carried in a first direction on an optical transmission medium and a second optical signal carried in a second direction on the optical transmission medium includes a bi-directional clock recovery loop and a bi-directional optical gate. The bi-directional clock recovery loop includes a first optical clock recovery circuit for recovering a first clock signal from the first optical signal and a second optical circuit for recovering a second clock signal from the second optical signal. The first and second optical circuits of the clock recovery loop share at least some common optical circuit elements. The bi-directional optical gate includes a first non-linear optical light mirror circuit for producing a first regenerated signal based on the first optical signal and the first clock signal and a second non-linear optical light mirror circuit for producing a second regenerated signal based on the second optical signal and the second clock signal. The first and second non-linear optical light mirror circuits share at least some common optical circuit elements.
    • 用于再生在光传输介质上沿第一方向承载的第一光信号和在光传输介质上沿第二方向承载的第二光信号的全光系统包括双向时钟恢复环和双向光 门。 双向时钟恢复环路包括用于从第一光信号恢复第一时钟信号的第一光时钟恢复电路和用于从第二光信号恢复第二时钟信号的第二光电路。 时钟恢复环路的第一和第二光电路共享至少一些共同的光电路元件。 所述双向光栅包括:第一非线性光学镜反射电路,用于基于所述第一光信号和所述第一时钟信号产生第一再生信号;以及第二非线性光反射镜电路,用于产生基于第二再生信号的第二再生信号 在第二光信号和第二时钟信号上。 第一和第二非线性光学镜反射器电路至少共享一些共同的光电路元件。
    • 5. 发明授权
    • Self-healing optical network
    • 自愈光网络
    • US5870212A
    • 1999-02-09
    • US6965
    • 1998-01-14
    • Sridhar NathanJohn A. Fee
    • Sridhar NathanJohn A. Fee
    • H04B10/20H04B10/02H04L12/437H04Q11/00H04J14/00
    • H04Q11/0062H04J14/0283H04J14/0295H04L12/437H04J14/0286H04Q2011/0039H04Q2011/0081H04Q2011/0092
    • A self-healing optical network carrying traffic between first and second optical linear terminals. The self-healing optical network including first, second, and third optical switching units, first, second, and third spare optical channels, and a working optical channel. The first, second, and third optical switching units are coupled in a ring configuration using said first, second, and third spare optical channels. The first and second optical switching units are coupled by the first spare optical channel and by the working optical channel. The first and second optical switching units each direct the traffic between the first and second optical linear terminals along the working optical channel or along the second and third spare optical channels in the event the working optical channel is not available.
    • 在第一和第二光学线性终端之间承载业务的自愈光网络。 包括第一,第二和第三光开关单元,第一,第二和第三备用光通道的自愈光网络以及工作光通道。 第一,第二和第三光交换单元使用所述第一,第二和第三备用光信道以环形配置耦合。 第一和第二光开关单元由第一备用光通道和工作光通道耦合。 在工作光信道不可用的情况下,第一和第二光交换单元各自沿着工作光信道或沿第二和第三备用光信道引导第一和第二光线性终端之间的业务。
    • 8. 发明授权
    • Methods and systems for controlling fiber polarization mode dispersion (PMD)
    • 用于控制光纤偏振模色散(PMD)的方法和系统
    • US07340148B2
    • 2008-03-04
    • US11741827
    • 2007-04-30
    • John A. Fee
    • John A. Fee
    • G02B6/02
    • G06F17/18C03B2203/36G01M11/336G02B6/02285G06F15/00
    • A method is provided for predicting an installed performance parameter of an optical fiber cable. The method includes obtaining a measurement indicative of a value of the performance parameter at a first moment in time. A measurement indicative of a value of the performance parameter at a second moment in time may then be obtained. A first correlation may then be determined between the measurement at the first moment in time and the measurement at the second moment in time. A value of the performance parameter at the second moment in time may then be estimated based upon the measurement at the first moment in time in combination with the first correlation, the first correlation being based upon observations of a manner in which the performance parameter varies over time for at least a second optical fiber.
    • 提供了一种用于预测光缆的安装性能参数的方法。 该方法包括在第一时刻获得表示性能参数的值的测量值。 然后可以获得指示在第二时刻的性能参数的值的测量。 然后可以在第一时刻的测量和在第二时刻的测量之间确定第一相关性。 然后可以基于第一时刻的测量结合第一相关性来估计在时间上的第二时刻的性能参数的值,第一相关是基于对性能参数变化的方式的观察 至少第二光纤的时间。
    • 9. 发明授权
    • Methods and systems for controlling fiber polarization mode dispersion (PMD)
    • 用于控制光纤偏振模色散(PMD)的方法和系统
    • US07283691B2
    • 2007-10-16
    • US10922131
    • 2004-08-20
    • John A. Fee
    • John A. Fee
    • G02B6/02
    • G06F17/18C03B2203/36G01M11/336G02B6/02285G06F15/00
    • A method is provided for predicting an installed performance parameter of an optical fiber cable. The method includes obtaining a measurement indicative of a value of the performance parameter at a first moment in time. A measurement indicative of a value of the performance parameter at a second moment in time may then be obtained. A first correlation may then be determined between the measurement at the first moment in time and the measurement at the second moment in time. A value of the performance parameter at the second moment in time may then be estimated based upon the measurement at the first moment in time in combination with the first correlation, the first correlation being based upon observations of a manner in which the performance parameter varies over time for at least a second optical fiber.
    • 提供了一种用于预测光缆的安装性能参数的方法。 该方法包括在第一时刻获得表示性能参数的值的测量值。 然后可以获得指示在第二时刻的性能参数的值的测量。 然后可以在第一时刻的测量和在第二时刻的测量之间确定第一相关性。 然后可以基于第一时刻的测量结合第一相关性来估计在时间上的第二时刻的性能参数的值,第一相关是基于对性能参数变化的方式的观察 至少第二光纤的时间。
    • 10. 发明授权
    • Interleaved bidirectional WDM channel plan
    • 交织双向WDM通道方案
    • US06658210B1
    • 2003-12-02
    • US09327039
    • 1999-06-04
    • John A. Fee
    • John A. Fee
    • H04B1008
    • H04J14/0279H04B10/2503H04J14/02H04J14/0226H04J14/0246H04J14/025
    • A bidirectional optical link has a plurality of wavelengths to carry information in first and second differing transmission directions to optimize system performance. First and second sets of wavelengths of the plurality of wavelengths are determined wherein the wavelengths of the first set alternate with the wavelengths of the second set. Transmitting is performed in the first transmission direction by way of the first set of wavelengths and in the second transmission direction by way of the second set of wavelengths whereby the transmission directions of adjacent wavelengths of the plurality of wavelengths differ. The wavelengths of the plurality of wavelengths are wavelength division multiplexed within the optical link and the wavelengths transmitted in the same direction are multiplexed with each other. The wavelengths of the plurality of wavelengths can be substantially evenly spaced apart from each other or adjacent wavelengths transmitted in different directions may overlap. The wavelengths of the first set of wavelengths and the wavelengths of the second set of wavelengths are transmitted by way of a single optical fiber. The single optical fiber is provided with a bidirectional amplifier. Selected wavelengths of the plurality of wavelengths can be moved during the transmitting of the plurality of wavelengths in order to avoid interference.
    • 双向光链路具有多个波长以携带第一和第二不同传输方向的信息以优化系统性能。 确定多个波长的第一和第二组波长,其中第一组的波长与第二组的波长交替。 通过第一组波长在第一传输方向和第二传输方向上通过第二组波长执行传输,由此多个波长的相邻波长的传输方向不同。 多个波长的波长在光链路内进行波分复用,并且在相同方向上发送的波长彼此多路复用。 多个波长的波长可以基本上彼此均匀间隔开,或者在不同方向上传输的相邻波长可以重叠。 第一组波长的波长和第二组波长的波长通过单根光纤传输。 单个光纤设有双向放大器。 可以在多个波长的发射期间移动多个波长的选定波长,以避免干扰。