Brillouin mirrors based on a single-mode optical fiber provide the simplest, completely passive, and most universal way to produce nanosecond pulses with extensive wavelength tunability. We propose an all-fiber solution, where a passively Q-switched Er-doped Briilouin fiber laser pumped by a low-power laser diode produces pulses with a peak/average power contrast of and, in association with a conventional dispersion-shifted fiber employed as an extracavity nonlinear medium, causes the generation of a nanosecond supercontinuum extending from 900 to over . Expanding evolution of the spectrum kicked off by the multicascade Brillouin process is reported.
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