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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science (Silicon Photonics)

Background:

  • Wavelength-scale optical modulators are critical for on-chip optical interconnects.
  • Modulator design involves trade-offs between bandwidth, size, and fabrication complexity.
  • Device size impacts capacitance and energy consumption, making miniaturization crucial.

Purpose of the Study:

  • To demonstrate a novel, ultra-compact optical modulator.
  • To investigate the performance of a short photonic crystal waveguide modulator.
  • To explore the benefits of slow-light enhanced absorption in silicon on insulator (SOI) modulators.

Main Methods:

  • Fabrication of a 3 μm long photonic crystal waveguide modulator on SOI.
  • Utilized free-carrier injection to induce slow-light enhanced absorption.
  • Combined refractive index shift with absorption modulation for enhanced bandwidth.

Main Results:

  • Achieved a 7 nm optical bandwidth at 1550 nm with a 10 dB extinction ratio.
  • Demonstrated modulation times between 500 ps and 100 ps.
  • The 3 μm modulator unexpectedly outperformed an 80 μm device in performance.

Conclusions:

  • Ultra-compact (3 μm) SOI modulators can achieve significant optical bandwidth.
  • Slow-light enhanced absorption is effective for broadband modulation in small devices.
  • Miniaturized modulators offer superior performance compared to larger counterparts for optical interconnects.