Impact of two-photon absorption on self-phase modulation in silicon waveguides
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- 5 July 2007
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 32 (14) , 2031-2033
- https://doi.org/10.1364/ol.32.002031
Abstract
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.Keywords
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