RARE EARTH DOPED OPTICAL FIBER AND METHOD FOR MANUFACTURING THE SAME

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PROBLEM TO BE SOLVED : To provide a Yb-doped optical fiber having low transmission loss, high photo darkening resistance or low PD loss increase, and high conversion efficiency. SOLUTION : In a silica glass optical fiber including a core doped with a rare earth element and at least P and a cladding provided on an outer periphery of the core, the core NA is 0.05 or more and 0.25 or less, the concentration of the rare earth element doped in the core is 2 wt.% or more and 10 wt.% or less, the concentration of P doped in the core is 3 wt.% or more and 20 wt.% or less, and the minimum transmission loss of the core in a wavelength band from 1, 000 nm to 1, 700 nm is 3 dB/km or more and 100 dB/km or less. COPYRIGHT : (C)2014, JPO&INPIT