Solitons in a PT-symmetric χ(2) coupler.

  title={Solitons in a PT-symmetric $\chi$(2) coupler.},
  author={M. {\"O}gren and Fatkhulla Kh. Abdullaev and Vladimir V. Konotop},
  journal={Optics letters},
  volume={42 20},
We consider the existence and stability of solitons in a χ(2) coupler. Both the fundamental and second harmonics (SHs) undergo gain in one of the coupler cores and are absorbed in the other one. The gain and loss are balanced, creating a parity-time (PT) symmetric configuration. We present two types of families of PT-symmetric solitons having equal and different profiles of the fundamental and SHs. It is shown that the gain and loss can stabilize solitons. The interaction of stable solitons is… 

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