We report numerical results for the spatiotemporal dynamics of circular-grating distributed-feedback devices with an intensity-dependent refractive index. For the specific geometry and range of variables considered, we find that modulational instabilities do not propagate in these structures. This is due to the 1/r intensity distribution associated with cylindrical waves, which reduces the effectiveness of the self- and cross-phase-modulation nonlinearities.
© 1999 Optical Society of America
K. J. Kasunic and E. M. Wright, "Nonlinear dynamics of circular-grating distributed-feedback semiconductor devices," J. Opt. Soc. Am. B 16, 96-102 (1999)