Original scientific paper
Characterization of step index optical fibers using two-beam interferometric method
E. A. Mehanna
; Military Technical College, Cairo, Egypt
A. S. Gerges
; Military Technical College, Cairo, Egypt
M. A. Hassouba
; Physics Department, Faculty of Science, Benha University, Benha, Egpyt
Abstract
The Pluta polarizing interference microscope is used to measure the refractive index profile and material dispersion of step index optical fibers. The refractive index profile of the fiber has been determined experimentally at different wavelengths using two-beam interference technique. Measuring these values at different wavelengths gives useful information about the structural behavior of highly oriented fibers. Also, the theoretical consideration for determining the refractive index is given. Some optical parameters which characterize the optical fiber such as the numerical aperture NA, normalized frequency ν, the acceptance angle θa and the number of modes MN propagating in the fiber with wavelength have been calculated. Also, the constants of the Cauchy’s dispersion formula were determined.
Keywords
two-beam interference; step index optical fiber; refractive index profile; material dispersion
Hrčak ID:
302072
URI
Publication date:
2.5.2006.
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