Nanoparticles (NPs) have been proved for various photonic and optoelectronic applications with superior performance. Doping holey-fibers with colloidal NPs is an idea with precedents in the optical literature. For example, CdZnS/ZnS core-shell quantum dots (QDs) based lasers at visible wavelengths [1, 2]; and PbS QDs doped fiber amplifiers operating at telecommunication wavelengths . In this paper we harness the potential of photonic crystal fibers (PCFs) doped with chemically synthesized CsPbBr3 Colloidal-NPs  to demonstrate gain functionalities in all-fiber optical microdevices.
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