Journal
OPTICS EXPRESS
Volume 12, Issue 7, Pages 1437-1442Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.12.001437
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Third-order add-drop filters based on series-coupled microring resonators were fabricated in silicon-rich silicon nitride with accurate dimensional control and negligible sidewall roughness. For the first time, a low 3 dB drop loss is demonstrated with a wide 24 nm free-spectral-range in a high-order microring filter without using the Vernier effect. The spectral response is matched by rigorous numerical simulation, and non-idealities in the drop- and through-port responses are shown to be of design origin and to be correctable. (C) 2004 Optical Society of America.
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