Dc. Hutchings et al., ALL-OPTICAL SWITCHING BASED ON NONDEGENERATE PHASE-SHIFTS FROM A CASCADED 2ND-ORDER NONLINEARITY, Optics letters, 18(10), 1993, pp. 793-795
All-optical switching by using a nondegenerate cascaded second-order n
onlinearity is described wherein a phase shift is induced at one frequ
ency owing to the presence of intense light at a different frequency.
A Mach-Zehnder waveguide device is proposed to take advantage of this
process and has applications for all-optical switching and demultiplex
ing, potentially at power levels near 10 W by using quasi-phase matchi
ng in semiconductor waveguides.