| 摘要 |
PROBLEM TO BE SOLVED: To provide an evaluation method, with which the regularity of gain can be easily estimated only by fiber for optical amplification. SOLUTION: In the evaluation method of fibers for optical amplification, flatness of gain is defined as the difference between the maximum and minimum values of gain over a wavelength range of 1,540 nm to 1,560 nm of a fiber for optical amplification, wherein erbium (Er), a rare earth element, is added to at least a part of a core. First, the ratio of an absorption valueα<SB>1,480</SB>is obtained at a wavelength of 1,480 nm to the peak absorption valueα<SB>peak</SB>of the fiber for optical amplification, that is,α<SB>1,480</SB>/α<SB>peak</SB>, and then the flatness of gain is deduced from the ratio obtained. COPYRIGHT: (C)2007,JPO&INPIT |
