Title: Inverse analysis of refractive index profile of optical waveguide from propagation‐mode near field pattern including noise
Abstract: Abstract To estimate the transverse refractive index distribution of optical waveguides, comparison of the measured light intensity and that calculated from the assumed refractive index distribution is proposed as a new method. The assumed refractive index distribution is corrected to give the best agreement between the two intensity distributions [5, 6]. This is the reverse procedure of the previous method in which the refractive index distribution is extracted directly from the field intensity distribution [1–4] and, therefore, the present method can be called the “inverse analytical method”. In this paper, simulated numerical investigations of the inverse analytical method are carried out when the intensity distributions are noise proofed. The true step and graded refractive index distributions of buried and diffused types are assumed and Gaussian noises with two standard deviations are added to their corresponding light intensity distributions. Then the present method is applied to assess their refractive index distributions. Numerical simulations of the previous differential method [2] also are carried out for buried‐type graded refractive index distribution. As the result of comparison, it is shown that the results do not depend on the smoothing process of the intensity distributions as they do in the case of the differential method. Therefore, it is quite possible to assess the refractive index distribution even without any smoothing process.
Publication Year: 1990
Publication Date: 1990-01-01
Language: en
Type: article
Indexed In: ['crossref']
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