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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 13 — Jun. 25, 2007
  • pp: 8290–8299

Al/Ge co-doped large mode area fiber with high SBS threshold

Ming-Jun Li, Xin Chen, Ji Wang, Stuart Gray, Anping Liu, Jeffrey A. Demeritt, A. Boh Ruffin, Alana M. Crowley, Donnell T. Walton, and Luis A. Zenteno  »View Author Affiliations

Optics Express, Vol. 15, Issue 13, pp. 8290-8299 (2007)

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We propose a novel approach of making large effective area laser fiber with higher threshold for the stimulated Brillouin scattering (SBS) using Al/Ge co-doping in the fiber core. The increased SBS threshold is achieved by reducing the acoustic-optic overlap integral while keeping the optical refractive index profile with a step structure. The manipulation of the overlap integral is done by adjusting the relative doping level between Al2O3 and GeO2 in the core. The mechanism is validated by detailed examples of numerical modeling. An Yb-doped double clad fiber with the core co-doped with Al2O3 and GeO2 was fabricated by the OVD process. Measured acoustic velocity profile using a scanning acoustic microscope verified that the acoustic velocity in the fiber core changes with the design. An amplifier utilizing the fiber demonstrated that the proposed fiber yielded 6 dB higher SBS threshold than a fiber without using the co-doping scheme.

© 2007 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2290) Fiber optics and optical communications : Fiber materials
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(140.3510) Lasers and laser optics : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 4, 2007
Revised Manuscript: June 11, 2007
Manuscript Accepted: June 14, 2007
Published: June 18, 2007

Ming-Jun Li, Xin Chen, Ji Wang, Stuart Gray, Anping Liu, Jeffrey A. Demeritt, A. B. Ruffin, Alana M. Crowley, Donnell T. Walton, and Luis A. Zenteno, "Al/Ge co-doped large mode area fiber with high SBS threshold," Opt. Express 15, 8290-8299 (2007)

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