Optical and Quantum Electronics

, Volume 26, Issue 4, pp 415–431

All-optical switching in the directional coupler caused by nonlinear refraction due to cascaded second-order nonlinearity

  • Roland Schiek

DOI: 10.1007/BF00304246

Cite this article as:
Schiek, R. Opt Quant Electron (1994) 26: 415. doi:10.1007/BF00304246


The intensity-dependent switching characteristic of the nonlinear coupler is simulated. Here, for the first time, a cascaded χ(2) : χ(2)second-order nonlinearity in addition to the direct χ(3) third-order nonlinearity is used as the switching nonlinearity. The nonlinear refraction due to the cascade process can produce much larger effects than the electronic third-order nonlinearity which yields a reduced switching power of the nonlinear coupler. The description of the dynamics of the switching process suggests that switching of subpicosecond pulses is realizable. The resonance of the cascaded nonlinearity is primarily the resonance of second harmonic generation. Thus, the strength of the cascaded nonlinearity can simply be optimized corresponding to the required bandwidth by adjusting the phase-mismatch.

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Roland Schiek
    • 1
  1. 1.Lehrstuhl für Technische ElektrophysikTechnische Universität MünchenMünchenGermany