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Continuously tunable slow-light device consisting of heater-controlled silicon microring array.

Fumihiro Shinobu1, Norihiro Ishikura, Yoshiki Arita

  • 1Department of Electrical and Computer Engineering, Yokohama National University, Hodogaya-ku, Yokohama, Japan. baba@ynu.ac.jp

Optics Express
|July 13, 2011
PubMed
Summary

Researchers created a tunable slow-light device using silicon microrings. This compact device offers adjustable delay for optical signals, demonstrating potential for high-speed data buffering applications.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Slow light enables optical buffering and signal processing.
  • Silicon microrings offer a compact and scalable platform for photonic integrated circuits.

Purpose of the Study:

  • To demonstrate a tunable slow-light device using all-pass silicon microrings.
  • To investigate the performance of the device for optical buffering applications.

Main Methods:

  • Fabrication of a compact all-pass silicon microring device using a CMOS-compatible process.
  • Integration of heaters for continuous tuning of center wavelength, bandwidth, and delay.
  • Experimental evaluation of the device's buffering capacity with 40 Gbps non-return-to-zero signals.

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Main Results:

  • A tunable slow-light device with a 0.014 mm² footprint was successfully fabricated.
  • Continuous tuning of delay up to 300 ps was achieved at fixed wavelengths with a 1 nm bandwidth.
  • Eye opening for 40 Gbps signals was observed at a 150 ps delay, confirming a 4-bit buffering capacity and a spatial buffering density of 0.29 kbit/mm².

Conclusions:

  • The demonstrated all-pass Si microring device offers a promising solution for on-chip optical buffering.
  • The tunable slow-light properties and high buffering density highlight the potential for advanced optical signal processing and communication systems.