| 简介 |
To produce a single-polarization rare-earth-added optical fiber, there was the problem that it was difficult to improve manufacturability and economic efficiency because it was necessary to implement stress distribution control on the base material itself of the optical fiber. The present disclosure is a rare-earth-added optical fiber for which within an arbitrary cross section of the rare-earth-added optical fiber, a pair of refractive index modulation points for which the diameter is d and the refractive index is n3 are provided at a position that is a distance Λ from the core center of the rare-earth-added optical fiber and that is to be centered with respect to the core center. One or more sets of the pair of refractive index modulation points are formed in the propagation direction of the rare-earth-added optical fiber. |
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