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Optical Fiber and Amplifier with a Samarium-Erbium Doped Active Fiber
Optical Fiber and Amplifier with a Samarium-Erbium Doped Active Fiber
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机译:掺E有源纤维的光纤和放大器
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摘要
The present invention relates to an optical amplifier, in particular for optical fiber telecommunication lines, operating with a transmission signal in a predetermined wavelength range, which amplifier comprises laser emitting active optical fiber doped with erbium, said fiber contains a further doping substance, distributed along the fiber, said doping substance shows an absorption, for a light having a wavelength lower than 1,540 nm, substantially higher than the absorption that the further doping substance shows for a light having a wavelength varying from 1,540 nm to the superior limit of the predetermined wavelength range of the transmission signal; preferably the further doping substance is samarium. Samarium contained in the fiber is capable of absorbing the spontaneous erbium emission, which would constitute a noise source, allowing a signal to be amplified in a wavelength range substantially corresponding to the tolerance range of the commercially available signal laser emitters.
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