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%e report measurements of frequency broadening due to self-phase-modulation (SPM) in optical fibers.The use of single-mode silica-core fibers and mode-locked argon-laser pulses leads to the simplest and cleanest measurements yet made of SPM. The qualitative features of the frequency spectrum are i' good agreement with theoretical expectations. The experiment provides an independent measurement of n2, ,the selffocusing coeAicient. The results also point to some simple and useful techniques based on fibers f6r the measurement and analysis. of mode-locked laser pulses.

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Observations of backward stimulated Brillouin scattering (SBS) in glass optical fibers are reported. Threshold for SBS has been achieved with less than 1 W of input power at 5355 Å. Relaxation behavior in the SBS signal has also been observed and is attributed to finite-cell-length oscillation. Experimental results are compared with theory, and the implied limitation to optical fiber transmission is discussed.

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