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A Compact Polarization MMI Combiner Using Silicon Slot-Waveguide Structures.

Omer Brand1, Benjamin Wolftson1, Dror Malka1

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This study introduces a compact silicon slot-waveguide polarization combiner for optical communication. It balances high-speed performance and energy efficiency, crucial for modern systems.

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Area of Science:

  • Photonics
  • Integrated Optics
  • Optical Communication Devices

Background:

  • Achieving high-speed performance and energy efficiency in optical communication is critical.
  • Minimizing power consumption and environmental impact is a growing concern.
  • Existing solutions face challenges in balancing speed and energy demands.

Purpose of the Study:

  • To design a compact transverse electric (TE)/transverse magnetic (TM) polarization multimode interference (MMI) combiner.
  • To utilize silicon slot-waveguide technology for improved performance.
  • To enhance energy efficiency in optical transmitter systems.

Main Methods:

  • Design and simulation of a compact MMI coupler.
  • Application of silicon slot-waveguide technology.
  • Analysis using the full-vectorial beam propagation method (FV-BPM) and Matlab codes.

Main Results:

  • A polarization combiner functioning effectively for both TM and TE modes.
  • Achieved an extinction ratio of 10.94 dB (TE) and 13.08 dB (TM).
  • Demonstrated low insertion losses (0.76 dB for TE, 0.56 dB for TM) and C-band operation.

Conclusions:

  • The proposed device offers a compact and efficient solution for polarization combining.
  • It presents a favorable balance between high-speed capability and energy efficiency.
  • The device shows robustness with a 400 nm MMI coupler length tolerance, suitable for photonic integrated circuits.