Cross-phase modulation due to a cascade of quadratic interactions in a PPLN waveguide

Carlo Liberale*, Ilaria Cristiani, Vittorio Degiorgio, Marco Marangoni, Gianluca Galzerano, Roberta Ramponi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The cross-phase modulation of a weak signal has been obtained in a periodically poled lithium-niobate waveguide as a result of the quadratic interaction of the signal with the second harmonic of an intense pump field. The nonlinear phase acquired by the signal has been measured as a function of the pump field intensity and of the phase mismatch with the second harmonic field. The measurements have been performed with a properly designed experimental setup based on a Mach-Zehnder interferometric scheme, which proved to be quite insensitive to slow mechanical and thermal drifts. Numerical simulations are in good agreement with experimental results.

Original languageEnglish (US)
Pages (from-to)405-410
Number of pages6
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number3
StatePublished - May 1 2006


  • Frequency conversion
  • Lithium niobate
  • Mach-zehnder interferometers
  • Nonlinear optics
  • Optical waveguides
  • Phase measurement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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