The effects of three-photon absorption on nonlinear directional coupling in semiconductors below half the gap are studied for both cw and sech2 pulse signals. The figure of merit associated with three-photon absorption includes not only material properties but also device design parameters. Numerical results show that at high powers, three-photon absorption significantly degrades nonlinear coupling, reduces throughput, and distorts output pulses. Good agreement is found between the theoretical model and experimental data.
© 1992 Optical Society of America
Original Manuscript: January 8, 1992
Published: May 15, 1992
C. C. Yang, J. S. Aitchison, A. Villeneuve, and G. I. Stegeman, "Effects of three-photon absorption on nonlinear directional coupling," Opt. Lett. 17, 710-712 (1992)