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Raman-Assisted Wavelength Conversion in Chalcogenide Waveguides

机译：硫族化物波导中的拉曼辅助波长转换

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摘要

We propose and theoretically investigate chalcogenide waveguide as a more energy-efficient platform than silicon waveguide for coherent anti-Stokes Raman scattering (CARS)-based wavelength conversion. 5.5-dB Stokes to anti-Stokes conversion efficiency is observed in an As2Se3 waveguide Raman wavelength converter, which is more than 10 dB higher than its silicon counterpart. Meanwhile, dispersion engineering is discussed for As2Se3 waveguide, in which the normal material dispersion can be solely compensated by waveguide dispersion in the 1550-nm wavelength band. It is found that a nonlinear dynamic phase shift causes significant fluctuation from the perfect phase-matching condition in the As2Se3 waveguide Raman wavelength converter, highlighted by a 20-dB efficiency reduction when the pump power is high. This is due to the comparable Raman and electronic susceptibility in As2Se3 waveguide. In addition, we explore the characteristics of the CARS process in the weak pump regime for the first time according to our knowledge. Such a scheme results in simultaneous anti-Stokes wavelength generation and signal depletion, which is critical for specific applications such as intensity modulation through pulse erasure. Conversion efficiency is much lower in the weak pump region, influenced by both signal and Stokes pump power. Signal depletion ratio up to 78% can be achieved.
机译：我们提出并在理论上研究硫族化物波导作为一种比硅波导更节能的平台，用于基于相干反斯托克斯拉曼散射（CARS）的波长转换。在As 2 Se 3 波导拉曼波长转换器中观察到5.5 dB斯托克斯到反斯托克斯的转换效率，比硅同类产品高出10 dB以上。同时，对As 2 Se 3 波导的色散工程进行了讨论，其中正常材料的色散可以通过在1550nm波段内的波导色散单独补偿。发现在As 2 Se 3 波导拉曼波长转换器中，非线性动态相移会导致从理想的相位匹配条件产生明显的波动，突出显示为20 dB泵功率高时效率降低。这是由于在As 2 Se 3 波导中具有可比的拉曼和电子磁化率。此外，根据我们的知识，我们首次探索了在弱泵工况下的CARS过程的特征。这种方案可同时产生反斯托克斯波长和信号损耗，这对于特定应用（例如通过脉冲擦除进行强度调制）至关重要。在弱泵区域，由于信号和斯托克斯泵浦功率的影响，转换效率要低得多。信号耗竭率可达到78％。

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