The design and characterization of ring-resonator-based filters with free spectral ranges of 100 and 50 GHz by use of SiO<sub>x</sub>N<sub>y</sub> technology is presented. Fiber-to-fiber insertion losses of 4.4 dB on the drop port and 2.1 dB on the through port have been achieved for a single-ring filter. An interleaver filter for a 25-GHz spaced dense wavelength-division multiplexing system with two cascaded rings is demonstrated. The filter has a 7.4-GHz bandwidth at -1 dB and an extinction ratio of 15 dB and is polarization independent.
© 2003 Optical Society of America
(060.4510) Fiber optics and optical communications : Optical communications
(130.3120) Integrated optics : Integrated optics devices
(230.5750) Optical devices : Resonators
(230.7380) Optical devices : Waveguides, channeled
Andrea Melloni, Raffaella Costa, Paolo Monguzzi, and Mario Martinelli, "Ring-resonator filters in silicon oxynitride technology for dense wavelength-division multiplexing systems," Opt. Lett. 28, 1567-1569 (2003)