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    • 2. 发明申请
    • TDM-AND WDM-BASED FBG SENSOR ARRAY SYSTEM
    • 基于TDM和WDM的FBG传感器阵列系统
    • WO2013131085A1
    • 2013-09-06
    • PCT/US2013/028871
    • 2013-03-04
    • OFS FITEL, LLC
    • HOLLAND, William, R.LI, YaowenNICHOLSON, Jeffrey, W.SUN, YingzhiZHU, Benyuan
    • G01K11/32
    • G01D5/35364G01K11/32
    • In a TDM- and WDM-based FBG sensor array system, a source emits a light covering a selected wavelength range. The light is amplified and then used to generate a series of pulses that are fed into an array of sensor gratings. The propagation of a pulse through the sensor array results in a time-domain-multiplexed output, comprising a series of output pulses in which each output pulse comprises a reflection of the input pulse at a respective grating in the sensor array. Raman amplification is used to amplify both the pulse input into and the time-domain multiplexed output from the sensor array, which is then coupled into an output processing stage for receiving the sensor output and for reconstructing the wavelength output of each grating in the sensor array. The wavelength change for each grating is then used to calculate a physical parameter(s) to be measured, such as temperature and/or strain.
    • 在基于TDM和WDM的FBG传感器阵列系统中,源发射覆盖所选波长范围的光。 光被放大,然后用于产生馈送到传感器光栅阵列中的一系列脉冲。 脉冲传播通过传感器阵列导致时域多路复用输出,其包括一系列输出脉冲,其中每个输出脉冲包括传感器阵列中相应光栅处的输入脉冲的反射。 拉曼放大用于放大来自传感器阵列的脉冲输入和时域多路复用输出,然后耦合到输出处理级,用于接收传感器输出并重建传感器阵列中每个光栅的波长输出 。 然后使用每个光栅的波长变化来计算要测量的物理参数,例如温度和/或应变。
    • 3. 发明申请
    • NA REDUCTION IN FIBER OPTICAL COUPLERS
    • 光纤耦合器中的NA减少
    • WO2012040405A1
    • 2012-03-29
    • PCT/US2011/052669
    • 2011-09-21
    • OFS FITEL, LLCHOLLAND, William, R.STRACHAN, William, J.
    • HOLLAND, William, R.STRACHAN, William, J.
    • G02B6/26
    • G02B6/262G02B6/24G02B6/2835
    • A fiber optical coupler comprises a bundle of optical fibers configured to couple light from a multiplicity of input light sources to an output port, each of the fibers comprising a multimode fiber having a core region and a cladding region surrounding the core region. The bundle has first and second axial sections arranged in tandem and adiabatically coupled to one another. Within the first section, the ratio of the cross-sectional core area of each of at least some of the fibers to the total cross-sectional area of each of those fibers is given by R1, and within the second section, the ratio of the cross-sectional core area of each of at least some of the fibers to the total cross-sectional area of each of those fibers is given by R2 > R1, where R2 is substantially constant along the axial length of the second section.
    • 光纤耦合器包括一束光纤,其被配置为将来自多个输入光源的光耦合到输出端口,每个光纤包括具有芯区域和围绕芯区域的包层区域的多模光纤。 束具有串联布置并彼此绝热耦合的第一和第二轴向部分。 在第一部分中,纤维中的至少一些纤维中的每一个的横截面纤芯面积与每个纤维的总横截面面积的比率由R1给出,并且在第二部分内, 至少一些纤维中的每一个的横截面核心面积与这些纤维中的每一个的总横截面积由R2> R1给出,其中R2沿着第二部分的轴向长度基本恒定。