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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 12, Iss. 7 — Jul. 1, 1995
  • pp: 1279–1286

Pulse generation in birefringent optical fibers by four-wave mixing and Raman scattering

R. Schulz and H. Harde  »View Author Affiliations

JOSA B, Vol. 12, Issue 7, pp. 1279-1286 (1995)

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Pulse generation in birefringent fibers by four-wave mixing in the presence of Raman scattering is theoretically modeled by a set of coupled nonlinear Schrödinger equations that are solved numerically. We discuss phase matching in the positive group-velocity dispersion regime for the split-pump configuration, which places the parametric frequency shift within the Raman band, and derive the combined initial gain. It is found that for shorter fiber lengths the symmetry-breaking roles of Raman–Stokes gain and Raman–anti-Stokes loss is balanced by four-wave mixing, resulting in a common effective power gain for both components. The importance of the relative phase of the four participating pulses as a switching parameter for the direction of the energy flow is demonstrated. It is further shown that, as a result of pulse walk-off, Raman scattering becomes the dominant process for longer fiber lengths. Theoretical results are compared with experimental cross-correlation pulse shapes.

© 1995 Optical Society of America

R. Schulz and H. Harde, "Pulse generation in birefringent optical fibers by four-wave mixing and Raman scattering," J. Opt. Soc. Am. B 12, 1279-1286 (1995)

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  32. Neglect of the XPM terms should not cause any major changes for the calculated pulse profiles or the energy conversion. Only some smaller deviations in the U-shaped region of the pump and in the wings of the Stokes pulse may be expected.
  33. The development and the evolution of the chirps and the compressibility of the pulses will be the subject of a future paper.

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