Tomography reconstruction of geometry and refractive index profile of highly asymmetric optical fiber preforms

Adam Novozámský; Jiří Slánička; Pavel Peterka

doi:10.1117/12.881850

14 December 2010 Tomography reconstruction of geometry and refractive index profile of highly asymmetric optical fiber preforms

Adam Novozámský, Jiří Slánička, Pavel Peterka

Author Affiliations +

Proceedings Volume 7746, 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 77461O (2010) https://doi.org/10.1117/12.881850
Event: 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2010, Liptovsky Jan, Slovakia

Abstract

Measurement of refractive index-profile of the optical fiber preforms is important for inspection of the quality of optical fiber waveguides and also for specification of additional treatment (e.g. overcoating or etching) of the preform before drawing the fiber. For preforms, non-destructive techniques are particularly useful. Some of the techniques are based on measurement of the deflection of a transversely directed light beam scanned along the diameter of the preform. This technique is also implemented in various commercially available instruments but the refractive index profile is mostly calculated with the assumption that the preform is circular. In the contribution we present method that we developed for tomography reconstruction of refractive index profile and outer geometry of preforms with highly asymmetric cross section. The method is based on numerical processing of a set of measured deflection functions at many angular projections. Practical aspects of processing the measured set of deflection functions will be discussed in detail on two examples: cylindrical gradient preform with a single mode core and almost cylindrical preform with highly elliptical gradient-index core for optical fiber for evanescent-wave sensing.

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Adam Novozámský, Jiří Slánička, and Pavel Peterka "Tomography reconstruction of geometry and refractive index profile of highly asymmetric optical fiber preforms", Proc. SPIE 7746, 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 77461O (14 December 2010); https://doi.org/10.1117/12.881850

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