Archimedean spiral cavity ring resonators in silicon as ultra-compact optical comb filters \textbar Request PDF Academic Article uri icon

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abstract

  • We present an ultra-compact comb filter using an add-drop ring resonator with an Archimedean spiral cavity. The cavity consists of two interleaved spiral branches which are connected in the center using arcs of circle of a radius that causes minimum bend loss. We describe the design procedure and examine the physical parameters governing the resonator performance. As an example, we demonstrate experimentally a comb filter with a 25 GHz channel spacing made of silicon photonic wires and only occupies an area of 80 x 90 microm(2), approximately a 70 fold size reduction compared to a racetrack resonator. The filter transmission is free of spurious reflections, attesting to the smooth transition between different sections of the resonator cavity. Over a 40 channel wavelength span, the filter exhibits a quality factor Q > 35,000, extinction ratios > 10 dB, and an excellent power uniformity with variations < 0.5 dB for both the through and drop ports.

authors

  • Xu, Dan-Xia
  • Delâge, André
  • McKinnon, Ross
  • Vachon, Martin
  • Ma, Rubin
  • Lapointe, Jean
  • Densmore, Adam
  • Cheben, Pavel
  • Janz, Siegfried
  • Schmid, Jens H

publication date

  • February 1, 2010