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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 31, Iss. 24 — Aug. 20, 1992
  • pp: 5069–5079

Mode-coupling processes in polymethyl methacrylate-core optical fibers

Jacques Dugas and Gilles Maurel  »View Author Affiliations


Applied Optics, Vol. 31, Issue 24, pp. 5069-5079 (1992)
http://dx.doi.org/10.1364/AO.31.005069


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Abstract

Aperture, attenuation, and far-field radiation diagrams have been studied on short lengths of commercial polymethyl methacrylate- (PMMA-) core optical fibers. The spectral attenuation of the PMMA constituting the core has been carefully measured and compared with the attenuation that may be calculated from optical properties of PMMA. Accurate extrinsic attenuation spectra have been obtained. Moreover, the dependence of the far-field radiation diagram on the fiber length and on the launching incidence of a laser beam has been studied on this side of the mode-equilibrium length. The analysis of these diagrams, first performed with the Gloge mode-coupling model, has been improved with the hypothesis that the mode-coupling processes are a result of light diffraction by structural anomalies in the core. The average size and form of these structural anomalies has been evaluated. They may be longitudinal microcracks of the PMMA coming from stress relaxation, which occurs during the fiber-drawing process.

© 1992 Optical Society of America

History
Original Manuscript: March 6, 1991
Published: August 20, 1992

Citation
Jacques Dugas and Gilles Maurel, "Mode-coupling processes in polymethyl methacrylate-core optical fibers," Appl. Opt. 31, 5069-5079 (1992)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-31-24-5069

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