Abstract
It is well known that reflectivity of s and p polarized light is a function of refractive indices of pair of media involved. This concept is used here to determine the variation of refractive index of a graded index and step index optical fiber preform. The salient feature of the technique is that, unlike interferometric measurements, refractive index can be determined without measuring the thickness of the sample. Two frames are captured here to extract values of reflectivity for s and p polarized light using a basic in-line setup. Also the results from the proposed set up are compared with the results obtained from phase shifting interferometric technique using a Mach Zehnder interferometer.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
K. Morishita, Determination of single-mode fiber refractive index profiles by a propagation mode near-field scanning technique, in Optical Waveguide Sciences (Springer,1983), pp. 101–107
K.K. Das, A.F.M.Y. Haider, Interferometric refractive index profile measurement of an optical fiber. Microwave Opt. Technol. Lett. 7(8) (1994)
US patent for metallic clad fiber optical waveguide patent, official gazette of the United States patent office. 860(3–4) (1969)
M. Young, Optical fiber index profiles by the refracted-ray method (refracted near-field scanning). Appl. Opt. 20 (1985)
T. Okoshi, K. Hotate, Refractive-index profile of an optical fiber: its measurement by the scattering-pattern method. Appl. Opt. 1973
B.K. Canfield, C.S. Kwiatkowski, M.G. Kuzyk, Direct deflection method for determining refractive-index profiles of polymer optical fiber preforms. Appl. Opt. 41(17) (2002)
K. Hotate, T. Okoshi, Measurement of refractive-index profile and transmission characteristics of a single-mode optical fiber from its exit-radiation pattern. Appl. Opt. 18(19) (1979)
A.D. Yablon, Recent progress in optical fiber refractive index profiling, in National Fiber Optic Engineers Conference (2011)
T. Das, K. Bhattacharya, Polarizing phase shifting interferometry of TIR light for measurement of refractive index and its spatial variation in liquid samples. Opt. Eng. 55(7) (2016)
Acknowledgements
The authors would like to acknowledge DST-CGCRI, Kolkata, India for providing optical fiber preforms.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Das, T., Bhattacharya, K. (2020). Quantitative Estimation of Spatially Varying Refractive Index in Optical Fibre Preform. In: Bhattacharya, I., Otani, Y., Lutz, P., Cherukulappurath, S. (eds) Progress in Optomechatronics. Springer Proceedings in Physics, vol 249. Springer, Singapore. https://doi.org/10.1007/978-981-15-6467-3_19
Download citation
DOI: https://doi.org/10.1007/978-981-15-6467-3_19
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-15-6466-6
Online ISBN: 978-981-15-6467-3
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)