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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 20,
  • Issue 5,
  • pp. 872-
  • (2002)

Parallel-Cascaded Semiconductor Microring Resonators for High-Order and Wide-FSR Filters

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Abstract

We demonstrate an optical channel dropping filter (OCDF) using three parallel-cascaded vertically coupled microrings with improved rolloff,bandpass flattening, and wide free spectral range (FSR) compared to a single-ring OCDF using single-mode tightly confined waveguides in both GaAs-AlGaAs and GaInAsP-InP. We achieve FSRs of 30 nm for GaAs-AlGaAs and 40 nm for GaInAsP-InP devices, which are three and four times greater,respectively, than those for single rings. The rolloff is 2.8 times faster than that for a single ring.

[IEEE ]

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