Cross-phase modulation-induced spectral broadening in silicon waveguides

Yanbing Zhang*, Chad Husko, Simon Lefrancois, Isabella H. Rey, Thomas F. Krauss, Jochen Schroeder, Benjamin J. Eggleton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We analytically and experimentally investigate cross-phase modulation (XPM) in silicon waveguides. In contrast to the well known result in pure Kerr media, the spectral broadening ratio of XPM to self-phase modulation is not two in the presence of either two-photon absorption (TPA) or free carriers. The physical origin of this change is different for each effect. In the case of TPA, this nonlinear absorption attenuates and slightly modifies the pulse shape due to differential absorption in the pulse peak and wings. When free carriers are present two different mechanisms modify the dynamics. First, free-carrier absorption performs a similar role to TPA, but is additionally asymmetric due to the delayed free-carrier response. Second, free-carrier dispersion induces an asymmetric blue phase shift which competes directly with the symmetric Kerr-induced XPM red shift. We confirm this analysis with pump-probe experiments in a silicon photonic crystal waveguide. (C) 2016 Optical Society of America

Original languageEnglish
Pages (from-to)443-451
Number of pages9
JournalOptics Express
Volume24
Issue number1
DOIs
Publication statusPublished - 11 Jan 2016

Keywords

  • WAVELENGTH CONVERSION
  • 2-PHOTON ABSORPTION
  • FEMTOSECOND PULSES
  • PHOTONIC WIRES
  • OPTICAL-FIBERS
  • DISPERSION

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