Mid-infrared Raman amplification and wavelength conversion in dispersion engineered silicon-on-sapphire waveguides
Mid-infrared Raman amplification and wavelength conversion in dispersion engineered silicon-on-sapphire waveguides
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DOI：
10.1088/2040-8978/16/1/015206
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发表时间：
2013
影响因子：
2.1
通讯作者：
Zhaolu Wang;Hongjun Liu;N. Huang;Qibing Sun;Xuefeng Li
中科院分区：
文献类型：
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作者：
Zhaolu Wang;Hongjun Liu;N. Huang;Qibing Sun;Xuefeng Li
对中红外波段蓝宝石衬底上硅（SOS）波导中基于受激斯托克斯拉曼散射（SSRS）的拉曼放大和基于相干反斯托克斯拉曼散射（汽车）的波长转换进行了理论研究。当线性相位失配Δk接近零时，当斯托克斯-泵浦光输入比足够大时，由于参量增益抑制效应，斯托克斯增益和转换效率迅速下降。斯托克斯增益随Δk的增大而增大，而有效的波长转换需要在不同的泵浦光强度下有合适的Δk。当泵浦强度为2 GW cm-2时，精确线性相位匹配（Δk = 0）下的转换效率比最佳线性相位失配下的转换效率小约28 dB。
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 Δk 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 Δk, whereas efficient wavelength conversion needs appropriate Δk under different pump intensities. The conversion efficiency at exact linear phase matching (Δk = 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.