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We demonstrate a reconfigurable filter based on the stimulated Brillouin scattering (SBS) effect in fiber with 3 dB bandwidth from 20 to 500 MHz. We analyze the influence of pump lines and pump spacing on the filter and propose an SBS‐based filter with low passband fluctuation by vectorial modulating multi‐lines pumps. The filter passband fluctuation is decrease to 0.49 dB by precise controlling the...