Reduced clad diameter rare earth doped fiber coils and optical amplifiers utilizing such coils

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According to the present invention, a rare earth doped fiber coil comprises a rare earth doped optical fiber having a rare-earth doped core surrounded by a cladding. The outer clad diameter is less than 100 μm. The rare earth doped optical fiber has a length of 10 m to 50 m and is coiled with a bend radius of less than 40 mm.