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Mode-evolution-based polarization rotator-splitter design via simple fabrication process.

Wangqing Yuan1, Keisuke Kojima, Bingnan Wang

  • 1Mitsubishi Electric Research Laboratories, 201 Broadway, Cambridge, MA 02139, USA.

Optics Express
|April 27, 2012
PubMed
Summary

This study introduces a novel polarization rotator-splitter on InP, achieving high extinction ratios and low loss across the C+L band. Its mode-evolution design offers excellent fabrication tolerance for integrated photonics.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Semiconductor Devices

Background:

  • Polarization rotator-splitters are crucial components in optical communication systems.
  • Existing devices often face challenges with insertion loss, extinction ratio, and fabrication tolerance.
  • Developing compact and efficient devices on platforms like Indium Phosphide (InP) is essential for advanced photonic integrated circuits.

Purpose of the Study:

  • To propose and demonstrate a mode-evolution-based polarization rotator-splitter on an InP substrate.
  • To achieve high performance metrics including polarization extinction ratio (PER) and low insertion loss (IL) over a broad wavelength range.
  • To leverage the mode-evolution principle for enhanced fabrication tolerance.

Main Methods:

  • A device combining a mode converter (bi-level and width taper) and an adiabatic asymmetric Y-coupler was designed.
  • The mode converter transforms the fundamental TM mode to the second-order TE mode.
  • The Y-coupler splits and converts modes, achieving the desired polarization splitting and rotation.

Main Results:

  • The device achieved a PER exceeding 25 dB and an IL below 0.5 dB for both TE and TM modes.
  • Performance was maintained across the 1528-1612 nm wavelength range (C+L band).
  • A large fabrication tolerance was demonstrated, with IL below 1 dB and PER over 17 dB for width variations up to +/- 0.12 µm.

Conclusions:

  • The proposed mode-evolution-based polarization rotator-splitter offers a robust solution for integrated photonic applications.
  • The device's performance and fabrication tolerance make it suitable for mass production in optical communication.
  • This design advances the development of compact and efficient polarization management devices on InP.