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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Optical switching using nonlinear polarization rotation inside silicon waveguides.

Lianghong Yin1, Jidong Zhang, Philippe M Fauchet

  • 1Institute of Optics, University of Rochester, Rochester, New York 14627, USA.

Optics Letters
|April 18, 2009
PubMed
Summary
This summary is machine-generated.

This study demonstrates a fast Kerr shutter using nonlinear polarization rotation in silicon waveguides. Despite free-carrier effects and walk-off, short pump pulses enable effective switching with predictable results.

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Area of Science:

  • Nonlinear optics
  • Integrated photonics
  • Semiconductor device physics

Background:

  • Nonlinear polarization rotation is crucial for all-optical switching.
  • Silicon photonics offers a platform for integrated optical devices.
  • Free-carrier effects and pulse walk-off can impede device performance.

Purpose of the Study:

  • To investigate nonlinear polarization rotation in silicon waveguides for Kerr shutter applications.
  • To analyze the impact of free-carrier effects and walk-off on switching performance.
  • To determine the feasibility of a fast Kerr shutter despite these challenges.

Main Methods:

  • Theoretical study of cross-phase modulation in silicon waveguides.
  • Numerical simulations to model pump-probe interactions.
  • Analysis of free-carrier generation via two-photon absorption.
  • Development of an approximate analytical solution for switching dynamics.

Main Results:

  • Nonlinear polarization rotation enables Kerr shutter functionality.
  • Free-carrier effects and walk-off significantly influence switching.
  • Short pump pulses mitigate detrimental effects of free carriers.
  • Analytical solutions accurately predict switching window characteristics.

Conclusions:

  • A fast Kerr shutter is achievable in silicon waveguides.
  • Careful pulse design is necessary to overcome nonlinear limitations.
  • The proposed method offers a viable route for integrated all-optical switching.