Abstract
Gain of Silica Thulium doped fiber amplifier (TDFA) is limited due to high phonon energy of Thulium ions. In this paper the gain performance of Silica based TDFA has been compared for 1050nm, 1050nm+800nm, 1050nm+1400nm and1050nm+1400nm+800nm pumping schemes. The gain enhancement of 6.5dB in triple pumping scheme (1050nm+1400nm+800nm) as compared to dual pumping (1050nm+1400nm) and 14.5dB enhancement than the 1050nm single pump has been observed. In the wavelength region 1455nm–1490nm, the observed gain triple pumping is more than 20dB with noise figure less than 5dB, the maximum gain obtained is 26.5dB at 1470nm.
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