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We fabricate a silicon microring-based photonic circuit comprising a passive NRZ-to-PRZ signal-format converter and a serial-cascaded modulator for clock-recovery applications. We demonstrate on the same chip 5-Gbit/s format conversion and 5-GHz sampling with 64-ps-width pulses.
This invited paper reviews our recent progress in silicon microresonator-based passive devices for potential on-chip optical interconnect applications. Specifically, we report our proposals and initial demonstrations of (i) many-element cascaded microdisk resonators as optical delay lines, and (ii) cascaded microring switch matrix. We also report our study on surface-state absorption-induced thermo-optical...
We report experimental demonstration and modeling of all-optical on-chip non-return-to-zero (NRZ) to pseudo-return-to-zero (PRZ) format conversion using narrow-band silicon microring resonator-based notch filters. Our proof-of-principle experiment using a carrier-injection-based tunable silicon microring resonator demonstrates NRZ-to-PRZ conversion at 3.6 Gbit/s. Our Fourier-transform-based modeling...
We report experiments and simulations of spiral-shaped microdisk resonator channel drop/add filters with a non-evanescently-coupled waveguide at the spiral notch. We observe asymmetry in modal distributions between the drop/add filters at the same resonance wavelengths.
We demonstrate NRZ-to-PRZ format conversion by using silicon second-order coupled-microring resonator-based notch filters. Our experiments show that 3.6-Gbps NRZ signals are converted to PRZ pulses with 40-ps width and 8-dB extinction ratio.
We demonstrate microring resonator-coupled multimode-interference-based crossings in 2times2 cross-grid array filters in silicon-on-insulator. Our experiments reveal a Q of ~14000 and an extinction ratio of ~15 dB in the drop-port spectrum via cascaded microring-coupled crossings.
We report initial numerical simulations of lateral waveguide-coupled spiral micropillar resonator-based channel drop filters. The spiral shape comprises two joint half-circles of slightly different radii with a notch on one side. Our two-dimensional finite-difference time-domain calculations suggest that such spiral microresonator filters are unidirectional - only the preferred sense of lightwave...
We report our numerical calculations and initial experiments on waveguide-coupled square micropillar resonator-based devices. Our calculations using two-dimensional finite-difference time-domain simulations and Fourier analysis show that waveguide coupling to a micropillar with a long flat coupling sidewall enables desirable directional wavevectors in the micropillar, and thus potentially gives rise...
We design a silicon MMI crossing laterally coupled microring resonator-based cross-connect filter. Numerical simulations suggest our design exhibits reduced insertion loss, reduced crosstalk, and more symmetric Lorentzian lineshapes as compared with the conventional plain-crossing-microring design.
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