| 简介 |
PROBLEM TO BE SOLVED : To provide an optical fiber for use as a high power optical amplification medium, which is highly efficient and which exhibits minimum nonlinear effects.SOLUTION : An optical fiber includes : (i) a silica based, rare earth-doped core having a first index of refraction n, the core comprising more than 1 mass% of Yb, the core having less than 5 dB/km loss at a wavelength situated between 1, 150 nm and 1, 350 nm and less than 20 dB/km loss at the wavelength of 1, 380 nm and slope efficiency of over 0.8; and (ii) at least one silica-based cladding surrounding the core and having a second index of refraction n, such that n>n. |
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