| 摘要 |
Apparatus and methods are disclosed for amplifying optical signals in a fiber optic system where the optical signals have a wavelength of at least N nanometers. The apparatus comprises means for providing a pump wavelength of (N-X) nanometers, where the wavelength (N-X) is not so short as to excite higher energy levels in the fiber optic system. The method comprises providing a pump wavelength of (N-X) nanometers, where the wavelength (N-X) is not so short as to excite higher energy levels in the fiber optic system.
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