Saturable-absorber-based autotracking filter is incorporated for the first time in hybrid Brillouin/erbium fiber laser to achieve a single-longitudinal-mode operation. We experimentally demonstrate a linewidth-reduction ratio of 166 with a 150-m Brillouin gain media. At the same time, with the intracavity erbium-doped fiber amplifier (EDFA) to compensate the loss introduced by the mode-selection elements, Brillouin pump threshold is as low as 3 mW under 120 mW of 980-nm pump power and the

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... m output power is 7 mW. Moreover, the autotracking filter also helps to suppress self-lasing and enables tuning range over the entire C-band. Index Terms-Nonlinear fiber optics, optical fiber lasers, Brillouin lasers, linewidth reduction.