The theoretical approach recently proposed for investigating cross-phase modulation phenomena in weakly guiding waveguides with an arbitrary cross section is revisited. The unidirectional propagation equation is reformulated so that it becomes possible to precisely investigate the evolution of the polarization state in both weakly and strongly guiding devices. For -oriented AlGaAs asymmetric waveguides, it is seen that interaction between the linear and nonlinear birefringences depends on the relative position of the slow axis of the device with respect to the 45° polarization-maintaining axis in the bulk medium. The design of an AlGaAs active polarization converter with a length of 3 cm and an effective area of ∼ 6μm<sup>2</sup> and that enables a quasi-total TE–TM conversion when using a peak power of 63 W is proposed.
© 1998 Optical Society of America
(170.4090) Medical optics and biotechnology : Modulation techniques
(190.0190) Nonlinear optics : Nonlinear optics
(230.7380) Optical devices : Waveguides, channeled
(260.1180) Physical optics : Crystal optics
Marie Fontaine, "Cross-phase modulation phenomena in strongly guiding waveguides: a theoretical approach revisited," J. Opt. Soc. Am. B 15, 964-971 (1998)