optical pulses at a first wavelength; and an optical fiber amplifier comprising an optical fiber
having a core containing a dopant to provide optical gain at the first wavelength and
anomalous dispersion over a wavelength range including the first wavelength and a second
wavelength. The optical fiber receives the ultrashort optical pulses, amplifies the ultrashort
optical pulses, and alters the wavelength of the ultrashort optical pulses to at least the …