Abstract
The threshold of the stimulated Brillouin scattering (SBS) in a long single-mode fiber excited with a multimode pump laser is investigated. It is theoretically shown that when the mode spacing of the pump laser is larger than the Brillouin-gain bandwidth, each Stokes mode experiences gain from only one pump mode and builds up independently in a long fiber with long interaction length. On the basis of this fact, the SBS threshold with an N-multimode pump with equal intensities is predicted N times greater than that with a single-mode pump. The theoretical predictions are verified by an experiment in which the number of longitudinal modes of a 1.32-μm Nd:YAG laser is changed.
© 1988 Optical Society of America
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