Coolerless pump wavelength optimization for Er/Yb-doped optical fiber amplifiers

摘要

An optical fiber amplifier has a pump module operating at a shorter wavelength at room temperature than conventional optical fiber amplifiers. At the maximum operating case temperature, the output from the pump module is still at a lower wavelength than the upper absorption band edge of the optical fiber. In a further embodiment, an Er—Yb co-doped optical fiber is further doped with aluminum to flatten a portion of the optical absorption profile. Co-doping with aluminum reduces the sensitivity of optical amplifier output to wavelength drift of the pump module when pumped near the secondary peak.