Yin Lianghong, Agrawal Govind P
Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Opt Lett. 2007 Jul 15;32(14):2031-3. doi: 10.1364/ol.32.002031.
We study the effects of two-photon absorption on the self-phase modulation (SPM) process in silicon waveguides while including both free-carrier absorption and free-carrier dispersion. An analytical solution is provided in the case in which the density of generated carriers is relatively low; it is useful for estimating spectral bandwidth of pulses at low repetition rates. The free-carrier effects are studied numerically with emphasis on their role on the nonlinear phase shift and spectral broadening. We also consider how the repetition rate of a pulse train affects the SPM process.
我们研究了双光子吸收对硅波导中自相位调制（SPM）过程的影响，同时考虑了自由载流子吸收和自由载流子色散。在产生载流子密度相对较低的情况下，给出了一个解析解；它有助于估计低重复率脉冲的光谱带宽。对自由载流子效应进行了数值研究，重点是它们在非线性相移和光谱展宽中的作用。我们还考虑了脉冲序列的重复率如何影响SPM过程。
