Abstract
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 0.7Er<sub>2</sub>O<sub>3</sub>/0.35Tmo<sub>2</sub>O<sub>3</sub> (1st core) and 0.7Tm<sub>2</sub>O<sub>3</sub>/0.15Ho<sub>2</sub>O<sub>3</sub> (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 Er<sup>3+</sup>: 4I<sub>13/2</sub> → 4I<sub>13/2</sub>, Tm<sup>3+</sup>: <sup>3</sup>F<sub>4</sub> → <sup>3</sup>H<sub>6</sub>, 1.8 μm and (Ho<sup>3+:5</sup>I<sub>7</sub> → <sup>5</sup>I<sub>8</sub>) 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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