Compact microring notch filters

By P. Absil, J. Hryniewicz, Brent E. Little, R. A. Wilson, L. Joneckis, P. Ho. IEEE Photonics Technology Letters, 2000

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All-optical AND/NAND logic gates using semiconductor microresonators (2003, background): “We also investigated the performance of similar GaAs devices [6].”
Review of Applications of Whispering-Gallery Mode Resonators in Photonics and Nonlinear Optics (2005, background): “Single ring-shaped WGR-based filters were studied in [88,156,166,167]; see also [8,165] for a review.”
All-optical nonlinear switching in GaAs-AlGaAs microring resonators (2002, background): “At resonance, near critical coupling [8] causes a deep extinction of 8.”
Microdisk tunable resonant filters and switches (2002, background): “A variety of passivemicrodisk and microring devices have been demonstrated [1]–[3].”
Transmission, group delay, and dispersion in single-ring optical resonators and add/drop filters-a tutorial overview (2004, background): “Lossy all-pass networks exhibit notch filter characteristics in the vicinity of resonance [63], [ 64 ].”
Optical transmission characteristics of fiber ring resonators (2004, background): “Optical ring resonators hold great promise for a variety of applications, including optical switching [4], [8], optical time delay [9], photonic biosensors [10], [11], laser resonators [1], add–drop filters [12], and filters with tailored response [13], [ 14 ].”