J. A. Arnaud, R. M. Derosier

The Bell System Technical Journal, vol 55, n°10, december 1976

ABSTRACT

A novel technique for measuring the refractive index profile of optical fibers is demonstrated, which offers substantial advantages over alternative methods. The method consists of illuminating a small area of the fiber core and measuring the total transmitted power. The transmission of leaky modes is accounted for in the manner reported previously by other authors. The index profiles of germanium-doped fibers obtained by this technique are compared to interferometric measurements. The resolution is shown to be limited by wave optics effects about… where Δ… The distortion of the index profile as the wavelength and waveoptics effects are investigated.

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