Three-Dimensional Cross-Coupled Silicon Nitride Racetrack Resonator-Based Tunable Optical Filter

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Abstract
A tunable three-dimensional silicon nitride racetrack resonator was experimentally demonstrated, with a microring resonator on a bottom layer and a feedback cross-coupled waveguide on a top layer. At a 1559.3-nm wavelength, an extinction ratio of more than 14 dB and free spectral range of 2.7 nm can be realized with a quality factor of about 1.88 x 10 4 . The filter performance, such as the resonance wavelength and extinction ratio, can be thermo-optically tuned based on the electrical control of a heater above the feedback waveguide. The presented device has a potential to be applied as a tunable modulator/switch as well as a highly sensitive sensor.
Funding Information
  • Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and Natural Science Foundation of Shanghai (17ZR1443400)
  • Hujiang Foundation of China (D15014)

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