Patent ID: 7570856
Filing Date: 2009-08-04
Classification: H01S

Abstract:
1. A method for amplifying optical signal pulses in the 1.52-1.62 microns wavelength range, the method comprising: providing a fiber having a large-mode-area core that includes germanium and aluminum, wherein the large-mode-area core has a diameter of between 10 microns and 50 microns and is surrounded by a plurality of cladding layers including an inner cladding having a diameter that is larger than the diameter of the core, and wherein a zero-dispersion wavelength of the core is longer than the wavelength of the signal pulses such that the wavelength range of the signal pulses is within a normal-dispersion wavelength range that is dominated by concentrations of the germanium and the aluminum; and amplifying the optical signal pulses in the large-mode-area core such that a fundamental mode of the optical signal pulses experiences normal dispersion when passing through the large-mode-area core.