| 摘要 |
The present invention relates to an amplification optical fiber comprising a structure which can yield a higher amplification gain, and a fiber optic amplifier including the same. The fiber optic amplifier comprises, at least, an amplification optical fiber for amplifying signals having wavelengths different from each other, and a pumping light source for supplying pumping light for signal amplification. The amplification optical fiber has one end for inputting pumping light and has a cutoff wavelength shorter than the signal wavelength but longer than the pumping light wavelength.
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