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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 16,
  • Issue 4,
  • pp. 562-
  • (1998)

Nd-Doped Double-Clad Fiber Amplifier at 1.06 \mum

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Abstract

We propose and demonstrate a double-clad neodymium (Nd)-doped fiber amplifier (NDFA) at 1.06\;\mum for a compact configuration of a high-power optical amplifier. The proposed 125\;\mum first cladding diameter in the double-clad fiber, provides the single-mode propagation of the signal lightwave into its doped core without misguiding the signal lightwave into the outer core (first cladding), by simply splicing with a standard single-mode fiber. Furthermore a fiber grating in a single-mode core of the double-clad fiber allows the double-pass configuration for the signal lightwave at 1.06\;\mum and also allows the pump lightwave coupling at 0.81\;\mum into the first cladding without employing a bulk dichroic mirror. We demonstrate the signal output power of 110 mW for a 550-mW pump input from a multimode fiber coupled pump source. Theoretical results predict an efficient high-power operation of the amplifier by improving the signal scattering loss in the double-clad fiber.

[IEEE ]

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