Spectral broadening in silicon waveguides is usually inhibited at telecom wavelengths due to some adverse effects related to semiconductor dynamics, namely, two-photon and free-carrier absorption (FCA). In this Letter, our numerical simulations show that it is possible to achieve a significant enhancement in spectral broadening when we properly preshape the input pulse to reduce the impact of FCA on spectral broadening. Our analysis suggests that the use of input pulses with the correct skewness and power level is crucial for this achievement.
© 2012 Optical Society of America
Original Manuscript: February 6, 2012
Revised Manuscript: May 2, 2012
Manuscript Accepted: May 4, 2012
Published: June 29, 2012
David Castelló-Lurbe, Enrique Silvestre, Pedro Andrés, and Víctor Torres-Company, "Spectral broadening enhancement in silicon waveguides through pulse shaping," Opt. Lett. 37, 2757-2759 (2012)