Mid-infrared Raman amplification and wavelength conversion in dispersion engineered silicon-on-sapphire waveguides
نویسندگان
چکیده
Raman amplification based on stimulated Stokes Raman scattering (SSRS) and wavelength conversion based on coherent anti-Stokes Raman scattering (CARS) are theoretically investigated in silicon-on-sapphire (SOS) waveguides in the mid-infrared (IR) region. When the linear phase mismatch 1k is close to zero, the Stokes gain and conversion efficiency drop down quickly due to the effect of parametric gain suppression when the Stokes-pump input ratio is sufficiently large. The Stokes gain increases with the increase of 1k, whereas efficient wavelength conversion needs appropriate 1k under different pump intensities. The conversion efficiency at exact linear phase matching (1k = 0) is smaller than that at optimal linear phase mismatch by a factor of about 28 dB when the pump intensity is 2 GW cm−2.
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