Mode conversion in nonlinear waveguides stimulated by the longitudinal bi-harmonic refractive index modulation
1 Institute of Spectroscopy, Russian Academy of Sciences - Troitsk, Moscow Region, 142190, Russia
2 Departamento de Fisica y Matematicas, Universidad de las Americas - Puebla, Santa Catarina Martir, 72820, Puebla, Mexico
Received: 16 January 2014
Accepted: 20 February 2014
We study specific features of resonant mode conversion in nonlinear waveguides stimulated by the bi-harmonic longitudinal modulation of its parameters, which includes changes of the waveguide depth as well as its bending (in the one-dimensional case) or spiraling (in the two-dimensional case). We demonstrate the possibility of simultaneous excitation of higher-order modes of different parities and topologies with controllable energy weights. The output mode composition is highly sensitive to the variation in the input power and detuning from the resonant modulation frequency.
PACS: 42.65.Tg – Optical solitons; nonlinear guided waves / 42.65.Jx – Beam trapping, self-focusing and defocusing; self-phase modulation / 42.65.Sf – Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics
© EPLA, 2014