Broadband NIR luminescence in double-core germanate optical fiber

In the paper, 1.4 - 2.2 mu m broadband emission under 796, 808, 980 nm laser diode excitation in low phonon energy germanate glass system co-doped with 0.7Er(2)O(3)/0.35Tmo(2)O(3) (1(st) core) and 0.7Tm(2)O(3)/0.15Ho(2)O(3) (2(nd) 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+: I-4(13/2)-> I-4(13/2), Tm3+: F-3(4)-> H-3(6), 1.8 mu m and (Ho3+:I-5(7)-> I-5(8)) 2 mu m emission bands. Excellent spectroscopic properties indicate that the developed germanate optical fiber is a promising active element for construction compact, broadband ASE sources.

Automated summary

The paper investigated 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 different impurities. A double-core, double-clad optical fiber was developed with excellent spectroscopic properties for constructing compact, broadband ASE sources.