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http://dx.doi.org/10.3807/KJOP.2011.22.1.005

Measurement of Numerical Aperture of Graded-index Plastic Optical Fiber by Using a Variable Aperture  

Kim, Dae-Kyu (Department of Physics, Yonsei University)
Kim, Bo-Ram (Department of Physics, Yonsei University)
Lee, Byoung-Hwak (Department of Physics and Chemistry, Korea Military Academy)
Park, Seung-Han (Department of Physics, Yonsei University)
Publication Information
Korean Journal of Optics and Photonics / v.22, no.1, 2011 , pp. 5-9 More about this Journal
Abstract
There are technical difficulties in measuring the numerical apertures of multi-mode gradient-index plastic optical fibers (GI-POFs) due to their strong speckle noise originating from dopants, non-uniformity of gradient-index profile, and multi-mode interference. Therefore, we propose a new method of obtaining the numerical aperture by controlling the size of the incident laser beam and measuring the numerical aperture of GI-POF. The results show that we can get a value for the numerical aperture of GI-POF very similar to that measured by the conventional method. We can also obtain the optimum launching condition of input beam and maximum coupling efficiency.
Keywords
Numerical aperture; Gradient-index plastic optical fiber; Speckles; Multi mode fiber;
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