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Effective area measurement in a single-mode optical fiber

机译:单模光纤中的有效面积测量

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The effective area (A_(eff)) of the single-mode fiber is an important measurement parameter. It is the area of the cross section of the beam into the fiber. Therefore, their evaluation requires the measurement of the field distribution in the fundamental mode LP_(01). In this work, we present a method to measure the effective area in the single mode fiber (SMF) and dispersion shifted fiber (DSF) using a 1550 nm wavelength in the input beam. The Direct Far Field (DFF) scan technique was used, making an accurately measure of the angular distribution of the intensity of the field from the single-mode fiber. The near field and far field for a circularly symmetric fiber are related through the inverse Hankel transform of order zero. Since this cannot be resolved analytically, we process our data obtained experimentally with a numerical integration to evaluate Hankel transform. If we know the near field, we can obtain the effective area from these data and equally of numerical integration.
机译:单模光纤的有效面积(A_(eff))是重要的测量参数。它是进入光纤的光束横截面的面积。因此,他们的评估需要在基本模式LP_(01)下测量场分布。在这项工作中,我们提出了一种使用输入光束中1550 nm波长来测量单模光纤(SMF)和色散位移光纤(DSF)中有效面积的方法。使用了直接远场(DFF)扫描技术,可以精确测量单模光纤的场强的角度分布。圆形对称光纤的近场和远场通过零阶汉克逆变换进行关联。由于无法通过解析解决此问题,因此我们使用数值积分对通过实验获得的数据进行处理,以评估汉克尔变换。如果我们知道近场,就可以从这些数据和数值积分中获得有效面积。

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