In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous material (e.g., erbium-doped SrY4(SiO4)3O material). The optical input signals include optical signals having wavelengths over a...http://www.google.com.au/patents/US6906855?utm_source=gb-gplus-sharePatent US6906855 - Method of amplifying optical signals using doped materials with extremely broad bandwidths
