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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 3 — Feb. 1, 2010
  • pp: 1937–1945

Archimedean spiral cavity ring resonators in silicon as ultra-compact optical comb filters

Dan-Xia Xu, André Delâge, Ross McKinnon, Martin Vachon, Rubin Ma, Jean Lapointe, Adam Densmore, Pavel Cheben, Siegfried Janz, and Jens H. Schmid  »View Author Affiliations

Optics Express, Vol. 18, Issue 3, pp. 1937-1945 (2010)

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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 × 90 µm2, 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.

© 2010 OSA

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(130.3120) Integrated optics : Integrated optics devices
(230.5750) Optical devices : Resonators
(230.7390) Optical devices : Waveguides, planar
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Integrated Optics

Original Manuscript: December 1, 2009
Revised Manuscript: January 6, 2010
Manuscript Accepted: January 9, 2010
Published: January 15, 2010

Dan-Xia Xu, André Delâge, Ross McKinnon, Martin Vachon, Rubin Ma, Jean Lapointe, Adam Densmore, Pavel Cheben, Siegfried Janz, and Jens H. Schmid, "Archimedean spiral cavity ring resonators in silicon as ultra-compact optical comb filters," Opt. Express 18, 1937-1945 (2010)

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