光子晶体光纤中四波混频光谱增益特性的研究

Study on spectral gain characterization of four-wave mixing in photonic crystal fiber

采用脉冲宽度为5 ps、峰值功率为5 W的可调谐钛宝石激光器泵浦长度为4.8 m,零色散点在810 nm的光子晶体光纤(PCF),观察到四波混频(FWM)3 dB的信号光增益,信号光和闲频光的间距为20 nm。通过调谐泵浦光的入射中心波长,研究了不同泵浦波长对FWM信号增益的影响,并与理论结果进行了对比,结果表明了很好的一致性。

By mean of a tunable Ti:sapphire laser with the duration of 5 ps and the peak power of 5 W to pump a photonic crystal fiber(PCF) of 4.8 m,a signal gain of 3 dB with a parametric width of 20 nm are observed.The influences of different input wavelength and pump peak power on the parametric gain and width are systematically investigated.The numerical results agree reasonably well with the experimental values.The effect of stimulated Raman scattering is also discussed.