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On-chip wavelength division multiplexing filters using extremely efficient gate-driven silicon microring resonator

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  • 1School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, 97331, USA.

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This study introduces gate-tunable silicon microring resonators (Si-MRRs) for wavelength division multiplexing (WDM) filters. These filters offer precise wavelength control with minimal power consumption, overcoming temperature and fabrication sensitivities.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Integrated Optics

Background:

  • Silicon microring resonators (Si-MRRs) are crucial for on-chip wavelength division multiplexing (WDM) due to their small size and low power usage.
  • Si-MRRs are highly sensitive to temperature and fabrication variations, necessitating active wavelength control.
  • Current control methods, like PIN diodes or thermal heaters, are power-intensive.

Purpose of the Study:

  • To demonstrate a novel gate-tuning method for Si-MRR-based WDM filters.
  • To achieve precise and low-power wavelength control across a wide range.
  • To overcome the limitations of existing wavelength stabilization techniques.

Main Methods:

  • Utilized an array of Si-MRRs integrated with high-mobility titanium-doped indium oxide (ITiO) gates.
  • Experimentally demonstrated gate-tuning for wavelength control.
  • Configured four cascaded ITiO-driven Si-MRRs to form WDM filters.

Main Results:

  • Achieved unprecedented wavelength tunability of up to 589 pm/V with a VπL of 0.050 V cm.
  • Maintained a high-quality factor of 5200 for the resonators.
  • Demonstrated continuous tuning across the 1543-1548 nm wavelength range with near-zero power consumption.

Conclusions:

  • Gate-tuning using ITiO offers an effective and energy-efficient solution for precise wavelength control in Si-MRR WDM systems.
  • This approach significantly reduces power consumption compared to traditional methods.
  • The demonstrated technology enables robust and tunable on-chip WDM filters for advanced optical communication systems.