Researchers at the Russian Academy of Sciences in Moscow demonstrated an all-fiber approach to passive Q-switching that allows considerable flexibility in the laser's output wavelength and temporal characteristics. In their demonstration, the team added a Bi fiber amplifier to the configuration. Operating the system in this configuration at the 1160-nm Bu transition, they observed 1.5-μs pulses containing 6.5 μJ at a repetition frequency of tens of kilohertz.