The Large Mode Area (LMA) fibers are attractive in the field of new components in optical fiber technology in the field of sensing and novel radiation sources. The numerical analysis of multi-ring (multi trench) fiber construction is investigated for eye-safe transmission spectral range (1400-2100 nm). The optical fiber refractive profile construction of ∆n (0.001- 0.004) for different radial step ∆r (1.0-1.6 µm) is used for the investigation of linearly polarized modes (LP01 and LP11) propagation. The maximum mode field diameter (MFD) of LP01 was calculated. The results confirm the LMA propagation possibility in the presented fiber construction. The single-mode guiding was confirmed for different ∆n and ∆r parameters in the investigated spectral range. The cutoff wavelength <1400 nm and single-mode operation are possible for ∆n=0.001 and ∆r=1 µm.
In the paper, 1.4 – 2.2 μm broadband emission under 796, 808, 980 nm laser diode excitation in low phonon energy germanate glass system co-doped with 0.7Er2O3/0.35Tmo2O3 (1st core) and 0.7Tm2O3/0.15Ho2O3 (2nd core) were investigated. Next, double-core, double-clad optical fiber has been developed by the modified rod-in-tube technique. Amplified spontaneous emission (ASE) in double-clad optical fiber with 3dB bandwidth was measured to be 346 nm and 677 nm for - 10 dB. ASE spectrum is a result of the partial donor-acceptor energy transfer and superposition of Er3+: 4I13/2 → 4I13/2, Tm3+: 3F4 → 3H6, 1.8 μm and (Ho3+:5I7 → 5I8) 2 μm emission bands. Excellent spectroscopic properties indicate that the developed germanate optical fiber is a promising active element for construction compact, broadband ASE sources.
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