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Reconfigurable polarization processor based on coherent four-port micro-ring resonator.

Dan Yi1, Jiapeng Luan1, Yi Wang1

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

This study presents an integrated polarization processor using a coherent 4-port micro-ring resonator (MRR) for advanced optical systems. The device functions as a versatile polarization controller, enabling polarization unscrambling and analysis for optical communications.

Keywords:
micro-ring resonatorpolarization analyzerpolarization descramblerpolarization switching

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Optical Communications

Background:

  • Versatile polarization processors are essential for optical systems manipulating polarized light.
  • Existing solutions may lack the multifunctionality required for diverse polarization control tasks.

Purpose of the Study:

  • To propose and realize an integrated polarization processor based on a coherent 4-port micro-ring resonator (MRR).
  • To demonstrate the processor's capability for polarization mode switching and unscrambling.
  • To evaluate its performance as a polarization analyzer (DOS and DOT).

Main Methods:

  • Development of a coherent 4-port MRR integrated with a 2-dimensional grating coupler (2DGC) acting as a polarization beam splitter.
  • Utilizing thermally tunable phase shifters to control the MRR and interference between inputs.
  • Experimental demonstration of polarization mode switching, unscrambling, and polarization analysis.

Main Results:

  • Successful implementation of a multi-function polarization processor capable of polarization descrambling, switching, and analysis.
  • Demonstrated polarization unscrambling with crosstalk below -21 dB for 40 GHz data lanes.
  • Achieved accurate polarization analysis with low deviations in orientation and ellipticity angles for both DOS and DOT modes.

Conclusions:

  • The coherent 4-port MRR serves as a versatile integrated polarization processor for optical systems.
  • The device is suitable for receivers in polarization-multiplexed direct-detection optical communication systems.
  • The demonstrated photonic circuit offers a compact and efficient solution for polarization control and analysis.