Abstract

We characterize the nonlinear propagation of picosecond pulses in chalcogenide ${\mathrm{As}}_2{\mathrm{S}}_3$ single-mode fiber using a pump-probe technique. The cross-phase modulation (XPM)-induced sideband broadening and stimulated Raman scattering (SRS)-induced sideband amplification are measured in order to map out the Raman gain spectrum of this glass across the C-band. We extract the Raman response function from the Raman gain spectrum and determine the power and polarization dependence of the SRS. In contrast to previous work using ${\mathrm{As}}_2{\mathrm{Se}}_3$ fiber, we find that the ${\mathrm{As}}_2{\mathrm{S}}_3$ fiber does not suffer from large two-photon absorption (TPA) in the wavelength range of the telecommunications band. We achieved a $20\mathrm{dB}$ peak Raman gain at a Stokes shift of $350{\mathrm{cm}}^{-1}$ in a $205\mathrm{mm}$ length of ${\mathrm{As}}_2{\mathrm{S}}_3$ single-mode fiber. The Raman gain coefficient is estimated to be $4.3\times {10}^{-12}\mathrm{m}/\mathrm{W}$ and the threshold pump peak power is estimated to be $16.2\mathrm{W}$ for the $205\mathrm{mm}$ ${\mathrm{As}}_2{\mathrm{S}}_3$ fiber. We also demonstrate that we can infer the dispersion of the ${\mathrm{As}}_2{\mathrm{S}}_3$ fiber and justify the Raman response function by comparing simulation and experimental results.

© 2009 Optical Society of America

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