Li Xiujian, Liao Jiali, Nie Yongming, Marko Matthew, Jia Hui, Liu Ju, Wang Xiaochun, Wong Chee Wei
Opt Express. 2015 Apr 20;23(8):10282-92. doi: 10.1364/OE.23.010282.
We demonstrate the temporal and spectral evolution of picosecond soliton in the slow light silicon photonic crystal waveguides (PhCWs) by sum frequency generation cross-correlation frequency resolved optical grating (SFG-XFROG) and nonlinear Schrödinger equation (NLSE) modeling. The reference pulses for the SFG-XFROG measurements are unambiguously pre-characterized by the second harmonic generation frequency resolved optical gating (SHG-FROG) assisted with the combination of NLSE simulations and optical spectrum analyzer (OSA) measurements. Regardless of the inevitable nonlinear two photon absorption, high order soliton compressions have been observed remarkably owing to the slow light enhanced nonlinear effects in the silicon PhCWs. Both the measurements and the further numerical analyses of the pulse dynamics indicate that, the free carrier dispersion (FCD) enhanced by the slow light effects is mainly responsible for the compression, the acceleration, and the spectral blue shift of the soliton.
我们通过和频产生互相关频率分辨光学光栅（SFG-XFROG）以及非线性薛定谔方程（NLSE）建模，展示了皮秒孤子在慢光硅基光子晶体波导（PhCWs）中的时间和光谱演化。用于SFG-XFROG测量的参考脉冲通过二次谐波产生频率分辨光学门控（SHG-FROG），并结合NLSE模拟和光谱分析仪（OSA）测量，得到了明确的预表征。尽管存在不可避免的非线性双光子吸收，但由于硅基PhCWs中慢光增强的非线性效应，仍显著观察到了高阶孤子压缩。对脉冲动力学的测量和进一步数值分析均表明，慢光效应增强的自由载流子色散（FCD）是孤子压缩、加速和光谱蓝移的主要原因。
