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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 42,
  • Issue 8,
  • pp. 2901-2907
  • (2024)

Closed-Loop Control of Photonic Ring Resonators by Means of Photo-Thermal Plasmonic Sensors

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This paper highlights the effectiveness of photo-thermal plasmonic sensors in enabling real-time closed-loop stabilization of photonic devices. To assess the waveguided optical power, the in-line detector leverages the photo-thermal resistance variation of a micrometric plasmonic strip in contact with the waveguide. The generated signal is used to lock to resonance a ring resonator against wavelength and temperature variations, in a silicon-based technology. Thanks to the high sensitivity of the detector and its limited penalty on the waveguide loss, automatic re-tuning of the ring resonator with a recovery time of $20 \,\mathrm{m}\mathrm{s}$ has been successfully achieved. The micrometric dimensions of the sensor, its technological simplicity, and the delivered signal (proportional to the optical power) make the photo-thermal plasmonic sensor an attractive in-line candidate for closed-loop control of optical devices, regardless of the technology employed for the photonic chip fabrication.

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