Patent ID: 6556346
Filing Date: 2003-04-29
Classification: G02B,H01S,H04B

Abstract:
Optical transmission system including an optical transmitting unit adapted to transmit an optical signal in a transmission wavelength band above 1570 nm, an optical receiving unit to receive said optical signal, an optical fiber link optically coupling said transmitting unit to said receiving unit and an optical amplifying unit coupled along said link, said optical amplifying unit having an amplification wavelength band including said transmission wavelength band and comprising an input for the input of said optical signal from said link, an output for the output of said optical signal into said link and an optical amplifier interposed between said input and said output to amplify said optical signal, said optical amplifier including an amplification fiber, a pump source for generating pump radiation and an optical coupler for optically coupling said pump source and said amplification fiber, characterized in that said amplification fiber includes an optical fiber co-doped with erbium and ytterbium.