论文信息 - Experimental study of SBS suppression with phase-modulation in all-fiber amplifier

Experimental study of SBS suppression with phase-modulation in all-fiber amplifier

A cascaded all-fiber amplifier was set up to investigate stimulated Brillouin scattering (SBS) suppression with phase-modulation (PM) in our experiment. With a modulation index of π / 2 , the SBS threshold power of the modulated amplifier can be enhanced with a factor of 3.5 compared with the unmodulated single frequency amplifier. In high power level, we demonstrate a 275 W all-fiber amplifier, where the SBS threshold enhancement factor is larger than 2.2 compared with the unmodulated case with SBS threshold power of 126 W. Further enhancing the output power is limited by available gain fiber and pump powers in this case.

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