FIZIKA A 15 (2006) 2 , 125-132

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CHARACTERIZATION OF STEP INDEX OPTICAL FIBERS USING TWO-BEAM INTERFEROMETRIC METHOD

E. A. MEHANNAa, A. S. GERGESa and M. A. HASSOUBAb

aMilitary Technical College, Cairo, Egypt
bPhysics Department, Faculty of Science, Benha University, Benha, Egpyt

Received 15 September 2004;   Revised manuscript received 27 May 2006
Accepted 30 August 2006      Online 22 December 2006

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 n, the acceptance angle qa 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.

PACS numbers: 42.79.-e, 42.81.Cn
UDC 535.321, 535.326, 535.328

Keywords: two-beam interference, step index optical fiber, refractive index profile, material dispersion

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