Abstract
Spectrum distortion induced by pump depletion of pump–probe-based stimulated Brillouin scattering along an optical fiber is investigated theoretically and experimentally. Spectral hole burning is observed in the middle of the fiber. The critical condition for spectrum distortion is defined, and normalized parameters are introduced to describe the critical condition with different injected powers in arbitrary-length fibers. The experimental observation is in reasonable agreement with the numerical analysis. The different spectrum distortion may introduce novel applications to programmable optical fiber filtering.
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