Abstract
When using the backscattering technique1 for attenuation measurements it is assumed that the loss coefficient of the backscattered radiation is equal to that of the forward-propagating beam. However, the backscattered radiation is scattered nearly uniformly over all angles, producing a modal distribution generally different from that of the direct beam. To evaluate the effect of this phenomenon, we investigated the properties of backscattered radiation. First the near-field distribution of backscattered power along the fiber length was measured by sampling the return waveform at different times corresponding to different positions; this allowed the modal evolution of the backward beam to be studied. In addition different launching conditions were used to correlate backscattered power distribution to the forward one.
© 1981 Optical Society of America
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