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FIZIKA A 15 (2006) 2 , 125-132
 
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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