The clad with a reduced diameter of the coil and rare earth doped fiber amplifier utilizing the same

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