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Journal Article

Non-reciprocal transmission and Schmitt trigger operation in strongly modulated asymmetric WBGs


Poulton,  Christopher
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

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Fujii, M., Maitra, A., Poulton, C., Leuthold, J., & Freude, W. (2006). Non-reciprocal transmission and Schmitt trigger operation in strongly modulated asymmetric WBGs. OPTICS EXPRESS, 14(26), 12782-12793. doi:10.1364/OE.14.012782.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6D68-8
We investigate numerically a non-reciprocal switching behavior in strongly modulated waveguide Bragg gratings (WBGs) having a longitudinally asymmetric stopband configuration. The minimum power predicted for a stable switching operation is found to be approximately 77 mW for a realistic waveguide structure made of prospective materials; we assume in this paper a nano-strip InGaAsP/InP waveguide having longitudinally asymmetric modulation of the waveguide width. The analysis has been performed with our in-house nonlinear finite-difference time-domain (FDTD) code adapted to parallel computing. The numerical results clearly show low-threshold Schmitt trigger operation, as well as non-reciprocal transmission property where the switching threshold for one propagation direction is lower than that for the other direction. In addition, we discuss the modulation-like instability phenomena in such nonlinear periodic devices by employing both an instantaneous Kerr nonlinearity and a more involved saturable nonlinearity model. (C) 2006 Optical Society of America.