Understanding Soliton Spectral Tunneling as a Spectral Coupling Effect

Hairun Guo, Shaofei Wang, Xianglong Zeng, Morten Bache

Research output: Contribution to journalJournal articleResearchpeer-review


Soliton eigenstate is found corresponding to a dispersive phase profile under which the soliton phase changes induced by the dispersion and nonlinearity are instantaneously counterbalanced. Much like a waveguide coupler relying on a spatial refractive index profile that supports mode coupling between channels, here we suggest that the soliton spectral tunneling effect can be understood supported by a spectral phase coupler. The dispersive wave number in the spectral domain must have a coupler-like symmetric profile for soliton spectral tunneling to occur. We show that such a spectral coupler exactly implies phase as well as group-velocity matching between the input soliton and tunneled soliton, namely a soliton phase matching condition. Examples in realistic photonic crystal fibers are also presented.
Original languageEnglish
JournalIEEE Photonics Technology Letters
Issue number19
Pages (from-to)1928-1931
Publication statusPublished - 2013


  • Soliton coupling effect
  • Soliton phase matching
  • Ultrafast nonlinear fiber optics


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