High gain rare earth doped phosphate glass optical amplification fibers

摘要

In accordance with the present invention, there is an optical amplifier fiber comprising a core manufactured from a phosphate glass doped with a rare earth element and a cladding manufactured from a phosphate glass surrounding the core. The core has a radiative lifetime in the range of 7 to 9 milliseconds at 1535 nm, a fluorescence lifetime of greater than 7.5 milliseconds at 1535 nm. The optical amplifier fiber has a diameter ratio in the range of 0.036 to 0.044, a transformation point difference of the core and the cladding, measured in (°C.), less than 5%. Further, the optical amplifier fiber has a coefficient of thermal expansion, measured in (/°C.), difference between the core and the cladding is less than 2% and an absorption cross section in the range of 0.60×10^−24m² to 0.72×10^−24 m², in the range of 1530 nm to 1540 nm.