Theory of spatial mode competition in a fiber amplifier

Details Theory of spatial mode competition in a fiber amplifier Theory of spatial mode competition in a fiber amplifier

2007-05-09

arxiv.org/abs/0705.1261v2

Physics

Optics

Corrected version, model in section II has been made more optical. Paper is submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.76.063801

Theory of monochromatic wave field amplification in a waveguide array based on expansion of the wave field in terms of guided array modes is developed. Equations for the expansion coefficients include cross-modal gain, which completely changes behavior of the amplified wave field. Analysis of two-mode amplification reveals new unusual features in characteristics of two-mode amplifier. Instead of unlimited growth of both modes for incoherent fields, one of the modes grows with no limit and suppresses the lower-power mode. Effects associated with the cross-modal gain are illustrated analytically on a system of two thin parallel planar waveguides. Conditions are found when a mode with lower gain can become the dominant one at the output of amplifier.

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