Influence of spectral broadening on femtosecond wavelength conversion based on four-wave mixing in silicon waveguides.
Influence of spectral broadening on femtosecond wavelength conversion based on four-wave mixing in silicon waveguides.
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DOI：
10.1364/ao.50.005430
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发表时间：
2011-10
期刊：
影响因子：
1.9
通讯作者：
Zhaolu Wang;Hongjun Liu;N. Huang;Qibing Sun;Jin Wen
中科院分区：
文献类型：
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作者：
Zhaolu Wang;Hongjun Liu;N. Huang;Qibing Sun;Jin Wen
从理论上研究了在1.5 mm长硅肋波导中通过四波混频实现电信波段的飞秒波长转换。与皮秒脉冲相比，飞秒脉冲在四波混频过程中由于自相位调制和交叉相位调制，光谱得到了极大的展宽，而当泵浦和信号脉冲宽度接近或小于100 fs时，由于频谱重叠，难以实现波长转换器。研究了光谱展宽对转换效率的影响。在重复频率为100 GHz时，500 fs脉冲的转换带宽为220 nm，峰值转换效率为-8 dB，效率高于皮秒脉冲泵浦效率。
Femtosecond wavelength conversion in the telecommunication bands via four-wave mixing in a 1.5 mm long silicon rib waveguide is theoretically investigated. Compared with picosecond pulses, the spectra are greatly broadened for the femtosecond pulses due to self-phase modulation and cross-phase modulation in the four-wave mixing process, and it is difficult to achieve a wavelength converter when the pump and signal pulse widths are close to or less than 100 fs in the telecommunication bands because of the spectral overlap. The influence of the spectral broadening on the conversion efficiency is also investigated. The conversion bandwidth of 220 nm and peak conversion efficiency of -8 dB are demonstrated by using 500 fs pulses with higher efficiency than the picosecond pulse-pumped efficiency when the repetition rate is 100 GHz.