This work is devoted to the study of the generation regime of an ultrashort pulse bunch in an erbium-doped fiber laser with hybrid mode-locking in the region of a low positive total intra-cavity group velocity dispersion. The pulse bunch has an optical spectrum 33 nm wide with a central wavelength of 1530 nm and has 2 pulses inside with a duration of ~143 fs at the full-width-half-maximum. The radio frequency spectrum in the region of the main pulse repetition rate, equal to ~8.5 MHz, demonstrates, depending on the pump power, the presence of 4 to 8 side peaks associated with the second pulse in the bunch. A comparison of the single-pulse and multi-pulse regimes demonstrates a twofold increase in the average output optical power of a pulse bunch for equal pump power and cavity parameters.
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