Low dispersion broadband integrated double-slot microring resonators optical buffer
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- Wang, C., Liu, X., Zhang, M. et al. Front. Optoelectron. (2016) 9: 571. doi:10.1007/s12200-016-0495-5
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Microring resonator optical buffer is attractive in high-speed optical network system, but ordinary microring resonator use strip waveguide as its basic light guide medium, which cannot provide small footprint, low dispersion and high delay-bandwidth product (DBP) simultaneously. Double-slot waveguide structure was first proposed to construct racetrack-microring resonators. It was found that cascading multiple microrings can increase the delay-bandwidth and lower the dispersion of the resonators by optimizing the structure parameters. Optical buffer cascaded by 8 microrings with flat bandwidth of 20 GHz provided the delay of 150 ps and the dispersion of ~10–7 ps/nm over 1530–1630 nm, and the footprint of each microring was about 51μm2. This study can provide design methods and theoretical basis support for practical application.