Determination of the refractive index profile of a symmetric fiber preform by the transport of intensity equation |
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Authors: | Ahmad Darudi R. Shomali M.T. Tavassoly |
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Affiliation: | aPhysics Department, Zanjan University, Zanjan 45195-313, Iran;bInstitute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45195-1159, Iran;cPhysics Department, Tehran University, Tehran, Iran |
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Abstract: | The refractive index profile of an axially symmetric fiber preform is determined by using the transport of intensity equation. In this method the preform is immersed in an index-matching liquid, and a collimated light beam impinges on it laterally. The intensity distributions of the transmitted light are measured on two close parallel planes inside the preform core. From the recorded intensity distributions, the deflection function is calculated by the transport of intensity equation. The refractive index profile is obtained by means of Abel inversion. Also, for comparison, the refractive index profile of the preform is measured by the focusing method and the results are in agreement with less than 3% error. |
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Keywords: | Refractive index profile Optical fiber preform Transport of intensity equation |
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