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9 May 2011 An analysis method for evaluating gradient-index fibers based on Monte Carlo method
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We propose a numerical analysis method for evaluating gradient-index (GRIN) optical fiber using the Monte Carlo method. GRIN optical fibers are widely used in optical information processing and communication applications, such as an image scanner, fax machine, optical sensor, and so on. An important factor which decides the performance of GRIN optical fiber is modulation transfer function (MTF). The MTF of a fiber is swayed by condition of manufacturing process such as temperature. Actual measurements of the MTF of a GRIN optical fiber using this method closely match those made by conventional methods. Experimentally, the MTF is measured using a square wave chart, and is then calculated based on the distribution of output strength on the chart. In contrast, the general method using computers evaluates the MTF based on a spot diagram made by an incident point light source. But the results differ greatly from those by experiment. In this paper, we explain the manufacturing process which affects the performance of GRIN optical fibers and a new evaluation method similar to the experimental system based on the Monte Carlo method. We verified that it more closely matches the experimental results than the conventional method.
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S. Yoshida, S. Horiuchi, Z. Ushiyama, and M. Yamamoto "An analysis method for evaluating gradient-index fibers based on Monte Carlo method", Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 80731I (9 May 2011);

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