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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 25718–25743

Nonlinear distortion of optical pulses by self-produced free carriers in short or highly lossy silicon-based waveguides

Hagen Renner  »View Author Affiliations


Optics Express, Vol. 20, Issue 23, pp. 25718-25743 (2012)
http://dx.doi.org/10.1364/OE.20.025718


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Abstract

An explicit analytical solution for the asymmetric attenuation of optical pulses by self-produced free carriers in silicon waveguides is derived. It allows us to quantify the pulse distortion and to calculate explicitly the free-carrier density and the nonlinear phase shifts caused by the Kerr effect and by free-carrier refraction. We show that omitting two-photon absorption (TPA) as a cause of attenuation and accounting only for free-carrier absorption (FCA) as done in the derivation appropriately models the pulse propagation in short or highly lossy silicon-based waveguides such as plasmonic waveguides with particular use for high-energy input pulses. Moreover, this formulation is also aimed at serving as a tool in discussing the role of FCA in its competition with TPA when used for continuum generation or pulse compression in low-loss silicon waveguides. We show that sech-shaped intensity pulses maintain their shape independently of the intensity or pulse width and self-induced FCA may act as an ideal limiter on them. Pulse propagation under self-induced free-carrier absorption exhibits some features of superluminal propagation such as fast or even backward travelling. We find that input pulses need to have a sufficiently steep front slope to be compressible at all and illustrate this with the FCA-induced pulse broadening for Lorentzian-shaped input pulses.

© 2012 OSA

OCIS Codes
(040.6040) Detectors : Silicon
(190.4390) Nonlinear optics : Nonlinear optics, integrated optics
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.5520) Ultrafast optics : Pulse compression
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Nonlinear Optics

History
Original Manuscript: August 17, 2012
Revised Manuscript: September 27, 2012
Manuscript Accepted: September 27, 2012
Published: October 30, 2012

Citation
Hagen Renner, "Nonlinear distortion of optical pulses by self-produced free carriers in short or highly lossy silicon-based waveguides," Opt. Express 20, 25718-25743 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-23-25718


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