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Proceedings Paper

Nonlinear mode competition and phasing in Yb-doped fiber amplifier
Author(s): Erik J. Bochove; Robert R. Rice; Philip R. Cunningham
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Paper Abstract

We used coupled-mode theory in an Yb-doped multimode fiber amplifier to compute the effects of gain saturation, nonlinear index, and fiber curvature on the evolution of the field. A positive nonlinear index results in power transfer to lower-order modes, usually the fundamental LP10 mode, and for negative nonlinear index the reverse is predicted. The nonlinear interaction between modes breaks the core’s cylindrical symmetry, resulting in recombination of degenerate LP mode pairs into super-modes: consisting of an expected in- and anti-phase pair, but also a quadrature of super-mode that reflects an increase of “information” capacity associated with nonlinearity. Convergence to all three super-modes was observed in our simulations, but the last more often. We also present observed evidence of mode phasing in experiments with two fiber amplifiers.

Paper Details

Date Published: 7 June 2004
PDF: 7 pages
Proc. SPIE 5335, Fiber Lasers: Technology, Systems, and Applications, (7 June 2004); doi: 10.1117/12.530334
Show Author Affiliations
Erik J. Bochove, Air Force Research Lab. (United States)
Robert R. Rice, Boeing Co. (United States)
Philip R. Cunningham, Boeing Co. (United States)

Published in SPIE Proceedings Vol. 5335:
Fiber Lasers: Technology, Systems, and Applications
L. N. Durvasula, Editor(s)

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