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AssigneeCorning O.T.I.SpA
InventorsFabrizio Di Pasquale, Fausto Meli, Giovanni Sacchi, Silvia Turolla
Estimating the term…
An optical amplifying unit (100; 100′) for amplifying optical signals in an optical transmission system has an amplification wavelength band with a lower wavelength limit greater than 1570 nm and includes an input (101) for the input of optical signals, an output (102) for the output of optical signals and an optical amplifier (104) interposed between the input (101) and the output (102) to amplify the optical signals. The optical amplifier (104) includes an amplification fiber (108) co-doped with erbium and ytterbium, at least a pump source (109, 110) to generate pump radiation and at least an optical coupler (111, 112) optically coupling the pump sources (109, 110) to the amplification fiber (108). The optical amplifying unit has a power gain of at least 31 dB when the optical signals have an input power of at least −10.5 dBm and wavelengths within the amplification wavelength band.
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.
Method for transmitting optical signals, comprising:
Optical amplifying unit for amplifying optical signals in an optical transmission system, said optical amplifying unit having an amplification wavelength band with a lower wavelength limit greater than 1570 nm and with a width of at least 15 nm, and including an amplification fiber, a pump source for generating pump radiation and an optical coupler for optically coupling said pump source to said amplification fiber, characterized in that said amplification fiber includes an optical fiber co-doped with erbium and ytterbium.
Dependencies are inferred from the claim text.