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Proceedings Paper

Novel SBS suppression scheme for high power fiber amplifiers
Author(s): Anping Liu
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Paper Abstract

A new scheme for suppression of Stimulated Brillouin Scattering (SBS) in high power fiber amplifiers is proposed where the fiber core diameter varies along the fiber length. The fiber has an ultra-large core diameter at most locations to suppress SBS, while at certain locations the core is relatively small to reduce bending sensitivity. A numerical model based on SBS rate equations is used to compare the SBS threshold of a uniform fiber to that of a fiber with variations in physical properties vs position. The model takes into account SBS gain dependence on temperature distributions as well as inhomogeneous spectral broadening due to NA variations. The modeling results show that the SBS threshold can be increased significantly when the seed power, fiber length, pump configuration, and fiber parameters are optimized. As a result, a single frequency fiber amplifier can generate up to 1 kW output power without the onset of SBS. Furthermore, the nonuniform fiber allows a high power amplifier to be packaged in a much more compact enclosure than an ultra-low NA fiber based amplifier.

Paper Details

Date Published: 23 February 2006
PDF: 9 pages
Proc. SPIE 6102, Fiber Lasers III: Technology, Systems, and Applications, 61021R (23 February 2006); doi: 10.1117/12.655715
Show Author Affiliations
Anping Liu, Aculight Corp. (United States)


Published in SPIE Proceedings Vol. 6102:
Fiber Lasers III: Technology, Systems, and Applications
Andrew J. W. Brown; Johan Nilsson; Donald J. Harter; Andreas Tünnermann, Editor(s)

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