AMPLIFIER FOR OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To operate an amplifier for optical fiber at high efficiency by using a wavelength of excitation light capable of disregarding absorption between the excitation levels of Tm(thulium) ion. SOLUTION: First, Yb(ytterbium) is first excited by a system co-added with the Yb, rather than directly exciting the Tm ions, and then due to the energy transfer between Yb and Tm ions of<3> H3 level of Tm are excited, and a population inversion between<3> F4 and<3> H6 levels is formed through no-radiative process.