Enhanced pump absorbing double-clad fiber

Details Enhanced pump absorbing double-clad fiber Enhanced pump absorbing double-clad fiber

2006-04-25

2006-04-25

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

Reexamination Certificate

active

07034995

ABSTRACT:
An optical fiber amplifier is considered comprising a mono-mode core, a first cladding around said core and at least a further cladding around said first cladding while said first cladding includes a ring shaped active region doped with rare earth material surrounding said mono-mode core. Advantageously, the first cladding is designed with a radial refractive index following an almost continuous decreasing function for increasing radius. The use of a continuously decreasing refractive index for the cladding at the outer border of the ring shaped active medium optimize the efficiency of the coupling between the core and the cladding.

REFERENCES:
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Nilsson J et al: YB3+-Ring-Doped Fiber for High-Energy Pulse Amplification Optics Letters, Optical Society of America, Washington, US, vol. 22, No. 14, Jul. 15, 1997, pp. 1092-1094, XP000699832.
Ankiewicz A et al.: “Use of Graded Elliptical Cladding for Efficient Pumping of Doped Fiber Cores” Optics Communications, North-Holland Publishing Co. Amsterdam, NL, vol. 133, No. 1/6, 1997, pp. 82-86, XP000641426.

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