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Integrated mode-evolution-based polarization rotators.

M R Watts1, H A Haus

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. mwatts@mit.edu

Optics Letters
|January 29, 2005
PubMed
Summary
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New integrated polarization rotators use mode evolution, requiring only two waveguide core layers. This design shows near-ideal performance without significant wavelength sensitivity, unlike mode coupling methods.

Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Waveguide Design

Background:

  • Polarization rotators are essential components in integrated photonic circuits.
  • Existing designs often involve complex structures or exhibit wavelength sensitivity.
  • Mode coupling approaches can be sensitive to fabrication variations and wavelength.

Purpose of the Study:

  • To present novel designs for integrated polarization rotators based on mode evolution.
  • To demonstrate a simplified design requiring only a pair of waveguide core layers.
  • To evaluate the performance and wavelength sensitivity of the proposed rotator designs.

Main Methods:

  • Utilizing mode-evolution theory for polarization rotation.
  • Employing finite-difference time-domain (FDTD) simulations.

Related Experiment Videos

  • Conducting eigenmode expansion (EME) simulations to analyze waveguide modes.

    • Main Results:

    • Designs for mode-evolution-based integrated polarization rotators were successfully developed.
    • Simulations confirmed near-ideal performance of the proposed rotator designs.
    • The mode-evolution approach exhibited no significant wavelength sensitivity, outperforming mode coupling methods.

    Conclusions:

    • Mode-evolution-based polarization rotators offer a promising solution for integrated photonics.
    • The presented designs achieve high performance with a simplified structure (two core layers).
    • The inherent low wavelength sensitivity makes these rotators robust for practical applications.