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    • 2. 发明授权
    • Depolarized semiconductor laser sources
    • 去极化半导体激光源
    • US06760151B1
    • 2004-07-06
    • US09559936
    • 2000-04-27
    • Edward C. VailMehrdad ZiariBernard FidricJianping ZhangStuart MacCormackVincent E. Dominic
    • Edward C. VailMehrdad ZiariBernard FidricJianping ZhangStuart MacCormackVincent E. Dominic
    • H01S300
    • H01S5/146H01S3/005H01S3/094003H01S3/094073H01S3/09415H01S5/06236H01S5/065H01S5/0652H01S5/0656
    • A semiconductor pump laser uses a depolarzer to depolarize the pump light entering the fiber amplifier. The depolarized light source is useful for reducing polarization dependent gain of fiber amplifiers. The pump laser includes one or more semiconductor, coherence-collapsed laser sources emitting polarized pump outputs, and one or more depolarizers disposed to depolarize the polarized pump output from the lasers. One or more fiber outputs are coupled to the one or more depolarizers to receive depolarized pump light. The depolarizer may include an N×M polarization preserving coupler having N inputs and M outputs, N and M being at least 2, an input to the depolarizer at a first coupler input, an output port from the depolarizer at a first coupler output. A polarization-controlling optical path is coupled between a second coupler output and a second coupler input. A polarization of light exiting the N×M coupler through the second coupler output is substantially orthogonal to a polarization of light entering the N×M coupler through the second coupler input.
    • 半导体泵浦激光器使用去极化器去除进入光纤放大器的泵浦光。 去极化光源对于减少光纤放大器的偏振相关增益是有用的。 泵浦激光器包括一个或多个发射偏振泵浦输出的半导体,相干折叠激光源和一个或多个去偏振器,其被设置为使来自激光器的偏振泵输出去极化。 一个或多个光纤输出耦合到一个或多个去偏振器以接收去极化的泵浦光。 去偏振器可以包括具有N个输入和M个输出,N和M至少为2的N×M偏振保持耦合器,在第一耦合器输入处的去偏振器的输入,来自第一耦合器输出处的去偏振器的输出端口。 偏振控制光路耦合在第二耦合器输出和第二耦合器输入之间。 通过第二耦合器输出离开NxM耦合器的光的极化基本上正交于通过第二耦合器输入进入NxM耦合器的光的偏振。
    • 10. 发明申请
    • Method and apparatus for rapidly and accurately determining a time constant from cavity ring-down data
    • 用于快速,准确地确定空腔衰减数据的时间常数的方法和装置
    • US20050012931A1
    • 2005-01-20
    • US10622323
    • 2003-07-17
    • Sze TanBernard FidricRobert Lodenkamper
    • Sze TanBernard FidricRobert Lodenkamper
    • G01J3/42G01N21/39G01N21/00
    • G01J3/42G01N21/39
    • Methods and apparatus for decreasing the time required to calculate a ring-down time from sampled ring-down data and/or increasing the accuracy of the calculated ring-down time are provided. The time required to obtain an accurate calculation of a ring-down time is reduced by performing a linear least squares fit using an estimate B1 of the background, then using the results of the fit to estimate the error in B1. The estimated error in B1 is then used to provide an improved estimate of the ring-down time. Alternatively, the time required to accurately calculate a ring-down time is reduced by averaging consecutive data points into “bins” and performing a linear least squares fit to the resulting binned signal. The parameters obtained from the fit to the binned signal are then used to obtain an improved estimate B2 of the background, and the ring-down time is calculated by performing a linear least squares fit using B2. Another method, applicable either by itself or in combination with either of the two preceding methods, is to improve accuracy by providing a low pass filter having a bandwidth related to a shortest expected ring-down time, to filter the ring-down signal before it is sampled.
    • 提供了用于减少从采样的降噪数据计算振铃时间所需的时间和/或增加计算的关闭时间的精度的方法和装置。 通过使用背景的估计B1执行线性最小二乘拟合,然后使用拟合的结果来估计B1中的误差,来减少获得准确计算消隐时间所需的时间。 然后使用B1中的估计误差来提供对减振时间的改进的估计。 或者,通过将连续的数据点平均成“bin”并对所得到的合并信号执行线性最小二乘法拟合来减少精确计算减振时间所需的时间。 然后使用从合并信号获得的参数来获得背景的改进的估计值B2,并且通过使用B2执行线性最小二乘法拟合来计算消隐时间。 另一种可以单独使用或与前述两种方法组合使用的方法之一是通过提供具有与最短期望的停机时间有关的带宽的低通滤波器来提高精度,以便在其之前对其进行滤波 被采样。