Abstract

In this paper, a Fourier transform infrared focal-plane-array detector was used to image the “bond-stretching” vibration mode observed near σ =1120 cm<sup>-1</sup> of highly Ge-doped graded-index multimode optical fibers (GI-MMFs). We show that the distribution of the peak wavenumber σ is nonuniform across the core and cladding of the MMF, i.e., σ is smaller in the core due to the Ge-doping. Next, as calibration curves between σ and the fictive temperature T<sub>f</sub> are not available in the literature for highly Ge-doped glasses (above 7w%), we have determined calibration curves from 1w% to 30w% in Ge. Then, we have applied these corrections in order to estimate, for the first time to our knowledge, the fictive-temperature distribution within multimode-fiber cross section. Using these curves, we show that T<sub>f</sub> is higher at the fiber edges, presumably due to faster cooling. Furthermore, there is also a T<sub>f</sub> increase in the center of the core (i.e., higher Ge content).

© 2007 IEEE

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