Title :
All-optical switching due to cascaded second-harmonic generation in directional couplers with laterally varying phase mismatches
Author_Institution :
Theor. Elektrotech., Paderborn Univ., Germany
fDate :
12/1/1999 12:00:00 AM
Abstract :
The local normal mode approach is employed to analyze cascaded second-harmonic generation (SHG) in directional couplers with different phase mismatches in both waveguides. The couplers are assumed to be fabricated in ferroelectric crystals, which are periodically domain inverted with different periods in both waveguide regions. These components are proposed to imitate the switching in nonlinearly asymmetric third-order directional couplers by using the cascaded second-order effect, which can mimic third-order interactions with effective third-order nonlinearities proportional to the reciprocal phase mismatch. The results for the second-order directional couplers are compared to those for the respective ideal third-order ones
Keywords :
optical directional couplers; optical harmonic generation; optical switches; optical waveguides; SHG; all-optical switching; cascaded second-harmonic generation; cascaded second-order effect; directional couplers; effective third-order nonlinearities; ferroelectric crystals; laterally varying phase mismatches; local normal mode approach; nonlinearly asymmetric third-order directional couplers; periodically domain inverted ferroelectrics; reciprocal phase mismatch; third-order interactions; waveguides; Couplings; Crystals; Directional couplers; Ferroelectric materials; Gratings; Mach-Zehnder interferometers; Nonlinear equations; Optical materials; Optical signal processing; Optical waveguides;
Journal_Title :
Quantum Electronics, IEEE Journal of
