Multiple-beam interference fringes applied to investigate the index profile of the optical fiber dip

A numerical-based phase shift method is presented to study optical fibers having a dip in the refractive index profile at the center of the core. Mathematical expressions for the shape of multiple-beam Fizeau fringes crossing a graded-index optical fiber (GRIN) comprising a central graded-index dip...

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Bibliographic Details
Published in:Optical and quantum electronics 2012-02, Vol.43 (1-5), p.35-48
Main Authors: El-Hennawi, H. A., El-Diasty, Fouad, El-Ghandoor, H., Soliman, Mona A.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Computer Communication Networks
Cross sections
Dipping
Electrical Engineering
Lasers
Liquids
Mathematical models
Optical Devices
Optical fibers
Optics
Photonics
Physics
Physics and Astronomy
Refractive index
Refractivity
Wedges
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Summary:A numerical-based phase shift method is presented to study optical fibers having a dip in the refractive index profile at the center of the core. Mathematical expressions for the shape of multiple-beam Fizeau fringes crossing a graded-index optical fiber (GRIN) comprising a central graded-index dip or GRIN fiber with a constant refractive index dip, immersed in a silvered liquid wedge, are derived. The index profile parameters of the central dip are determined by comparing the theoretical fringe shape across the fiber cross-section and the experimental fringe shape obtained from micro-interferograms of the wedge interferometer.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-011-9501-8