Bulg. J. Phys. vol.22 no.3-4 (1995), pp. 067-071



A Modified Nonlinear Method for Optical Waveguide Parameters Control

L.M. Ivanov1, N.I. Minkovski2, G.K. Georgiev1
1Institute of Electronics, 72, Tzarigradsko Shose, Sofia, Bulgaria
2Institute of Laser Technique, 33A Galitchitza Str., 1126 Sofia, Bulgaria
Abstract. We have proposed a modernized nonlinear optical method for quality control of optical fibre parameters utilizing four-wave mixing process (FWM). Now it is possible, simultaneously with the core diameter 2a, the core-cladding refractive index difference Δn, the normalized frequency V and the cutoff wave-length λc, to determine the concentration C of a single dopant. To our knowledge this is the first time that a nonlinear method is used to determine fibre parameters, that might prove to be a valuable and highly accurate one.

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