Wang Zhaolu, Liu Hongjun, Huang Nan, Sun Qibing, Wen Jin
State Key Laboratory of Transient Optics and Photonics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science (CAS), Xi'an, China.
Appl Opt. 2011 Oct 1;50(28):5430-6. doi: 10.1364/AO.50.005430.
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.
理论上研究了在1.5毫米长的硅肋形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，由于四波混频过程中的自相位调制和交叉相位调制，飞秒脉冲的光谱大大展宽，并且当泵浦和信号脉冲宽度在电信波段接近或小于100飞秒时，由于光谱重叠，很难实现波长转换器。还研究了光谱展宽对转换效率的影响。当重复频率为100千兆赫时，使用500飞秒脉冲展示了220纳米的转换带宽和-8分贝的峰值转换效率，其效率高于皮秒脉冲泵浦效率。
