Nonlinear mode competition and phasing in Yb-doped fiber amplifier

Erik J. Bochove; Robert R. Rice; Philip R. Cunningham

doi:10.1117/12.530334

7 June 2004 Nonlinear mode competition and phasing in Yb-doped fiber amplifier

Erik J. Bochove, Robert R. Rice, Philip R. Cunningham

Proceedings Volume 5335, Fiber Lasers: Technology, Systems, and Applications; (2004) https://doi.org/10.1117/12.530334
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

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.

Citation Download Citation

Erik J. Bochove, Robert R. Rice, and Philip R. Cunningham "Nonlinear mode competition and phasing in Yb-doped fiber amplifier", Proc. SPIE 5335, Fiber Lasers: Technology, Systems, and Applications, (7 June 2004); https://doi.org/10.1117/12.530334

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