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    • 1. 发明授权
    • Optical grating-based filter
    • 基于光栅的滤光片
    • US06834142B2
    • 2004-12-21
    • US10098890
    • 2002-03-15
    • Timothy J. BaileyMartin A. PutnamJay W. DawsonJoseph PintoJames S. SirkisPaul S. Szczepanek
    • Timothy J. BaileyMartin A. PutnamJay W. DawsonJoseph PintoJames S. SirkisPaul S. Szczepanek
    • G02B602
    • G02B6/2932G02B6/02176G02B6/0218G02B6/022G02B6/266G02B6/29322G02B6/29323G02B6/29395G02B6/29398
    • An optical filter for filtering a spectral profile of an optical signal for providing an output signal having a desire gain profile, such as a flatten gain profile. The filter comprises an optical waveguide that includes a core disposed within a cladding having an outer dimension greater than 0.3 mm. A Bragg grating is imparted or written in the core of the waveguide that attenuates the received optical input signal in accordance with a defined reflection or transmission filter profile. The Bragg grating may be a slanted grating. The filter profile is complementary to the spectral gain profile of the input signal to provide an output signal having a substantially flat spectral profile of a desired wavelength band. The cladding of the waveguide may have a mechanically advantageous outer geometry (e.g., a “dogbone” shape) for allowing an axial compressive force to tune the Bragg grating. The waveguide may be package within an athermal device, which tunes the grating to compensate for temperature dependent changes. Further, the waveguide may be packaged in a tuning device to selective tune the gratings to shift the center wavelength of the spectral profile of the filter, or to change the shape of the filter profile.
    • 一种滤光器,用于对光信号的光谱分布进行滤波,以提供具有期望增益分布的输出信号,例如平坦增益分布。 滤波器包括光波导,其包括设置在具有大于0.3mm的外部尺寸的包层内的芯。 布拉格光栅被传递或写入波导的核心,根据定义的反射或透射滤波器轮廓衰减接收到的光输入信号。 布拉格光栅可以是倾斜光栅。 滤波器曲线与输入信号的频谱增益分布互补,以提供具有期望波长带的基本上平坦的谱分布的输出信号。 波导的包层可以具有机械有利的外部几何形状(例如,“狗骨”形状),用于允许轴向压缩力调谐布拉格光栅。 波导可以封装在无热器件中,其调谐光栅以补偿温度依赖的变化。 此外,波导可以封装在调谐装置中以选择性调谐光栅以移动滤光器的光谱分布的中心波长,或者改变滤光片的形状。
    • 10. 发明授权
    • Concatenated magneto-optic field sensors
    • 串联磁光场传感器
    • US5736737A
    • 1998-04-07
    • US561810
    • 1995-11-22
    • Jay W. DawsonTrevor W. MacDougall
    • Jay W. DawsonTrevor W. MacDougall
    • G01R15/24G01R19/00G01R33/032H01J5/16G01J4/00
    • G01R33/0322
    • A Faraday effect current sensor uses a plurality of concatenated field sensors, with a single light source and a single detector. At least two Faraday effect sensing elements (single mode sensing fibers) are used, preferably at least three, the sensing elements being interconnected by fusion spliced, polarizing fibers. The sensing fibers may be oriented generally straight, and arranged to form a regular polygon, e.g., an equilateral triangle for a three-element sensor. The locations of the splices between the sensing fibers and the polarizing fibers may further be advantageously arranged such that the sensing fibers form a substantially closed path which may be placed about the current-carrying conductor. The linearity of the sensor response may be improved by selecting an appropriate value of the bias angle of each sensing element, optimally equal to arctan�1/.sqroot.(2n-1)! where n is the number of sensing elements. The present invention may also be adapted for use as a differential current sensor wherein each sensing element is housed in a separate package allowing the elements to be placed about different conductors at a Y-branch, or about a single conductor at different locations.
    • 法拉第效应电流传感器使用多个级联场传感器,具有单个光源和单个检测器。 使用至少两个法拉第效应感测元件(单模感测光纤),优选地至少三个,感测元件通过熔接的偏振光纤相互连接。 感测纤维可以大致直线定向,并且被布置成形成用于三元件传感器的正多边形,例如等边三角形。 感测纤维和偏振光纤之间的接头的位置可以进一步有利地布置成使得感测纤维形成基本上封闭的路径,其可以放置在载流导体周围。 可以通过选择每个感测元件的偏置角的适当值来最佳地等于arctan [1 / 2ROOT(2n-1)],其中n是感测元件的数量,可以改善传感器响应的线性。 本发明还可以适用于差分电流传感器,其中每个感测元件容纳在单独的封装中,允许将元件放置在Y分支处的不同导体周围,或者在不同位置处围绕单个导体放置。