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Core-clad fibers on the basis of high-purity 1300 ppmw Pr(3+)-dopedGa-Ge-As-Se and 2000 ppmw Pr(3+) -doped In-Ge-As-Se-I glasses have beenprepared. The minimum optical losses of the fibers are at the level of 1 dB/min the wavelength range, where there is no influence of the praseodymiumabsorption. At present, it is the best result obtained for core-clad rare-earth-doped chalcogenide fibers with high dopant concentration. The fibersexhibit the broadband luminescence in the spectral range of 3.5-5.5 micron. Thevalues of luminescence lifetime at the wavelength of 4.7 micron are within6.5-8.2 ms closed to those for the bulk glasses obtained previously. Simulationof laser properties for these core-clad fibers in the three-level cascadescheme was carried out. The low level of optical losses experimentally achievedin these fibers is one of main criteria for development of mid-IR fibersystems.

Core-clad Pr(3+)-doped Ga(In)-Ge-As-Se-(I) glass fibers: preparation, investigation, simulation of laser characteristics