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Proceedings Paper

SBS mitigation with 'two-tone' amplification: a theoretical model
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Paper Abstract

A new technique for mitigating stimulated Brillouin scattering (SBS) effects in narrow-linewidth Yb-doped fiber amplifiers is demonstrated with a model that reduces to solving an 8×8 system of coupled nonlinear equations with the gain, SBS, and four-wave mixing (FMW) incorporated into the model. This technique uses two seed signals, or 'two-tones', with each tone reaching its SBS threshold almost independently and thus increasing the overall threshold for SBS in the fiber amplifier. The wavelength separation of these signals is also selected to avoid FWM, which in this case possesses the next lowest nonlinear effects threshold. This model predicts an output power increase of 86% (at SBS threshold with no signs of FWM) for a 'two-tone' amplifier with seed signals at 1064nm and 1068nm, compared to a conventional fiber amplifier with a single 1064nm seed. The model is also used to simulate an SBS-suppressing fiber amplifier to test the regime where FWM is the limiting factor. In this case, an optimum wavelength separation of 3nm to 10nm prevents FWM from reaching threshold. The optimum ratio of the input power for the two seed signals in 'two-tone' amplification is also tested. Future experimental verification of this 'two-tone' technique is discussed.

Paper Details

Date Published: 22 February 2008
PDF: 9 pages
Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731R (22 February 2008); doi: 10.1117/12.774584
Show Author Affiliations
T. J. Bronder, Air Force Research Lab. (United States)
T. M. Shay, Air Force Research Lab. (United States)
I. Dajani, Air Force Research Lab. (United States)
A. Gavrielides, Air Force Research Lab. (United States)
C. A. Robin, Air Force Research Lab. (United States)
C. A. Lu, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 6873:
Fiber Lasers V: Technology, Systems, and Applications
Jes Broeng; Clifford Headley, Editor(s)

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