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A photonic temporal differentiator based on cascaded microring resonators is proposed. By approaching the critical coupling condition of through port of the cascaded microrings, first order all-optical differentiation functionality can be realized. The proposed scheme is experimentally verified by Gaussian-like pulse trains with data rate up to 80 Gb/s.
A High-Q microdisk add-drop filter integrated with grating couplers in SOI was designed and fabricated. By introducing asymmetrical coupling, resonance with a Q factor as high as 1.7 times 105 and an extinction-ratio over 15 dB is obtained. The essentially critical coupling for a resonant mode with a Q factor of 4.2 times 104 is also realized.
Characteristics of microring/racetrack resonators, in submicron SOI rib waveguides, have been investigated. The effects of waveguide dimensions, coupler design, roughness, and oxide cladding are considered. Moreover, guided mode, loss and dispersion of such waveguides are analyzed.
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