Transmission characteristics of optical pulse in nested nonlinear microring resonators and gratings

In this paper, the transmission behaviors of a light pulse through nested nonlinear microring resonators (NMRs) and gratings are investigated. The system design consists of two-defect gratings incorporating nested NMR and the uniform grating. In modeling, the laser pulse with wavelength centered at 1.55 mu m is input into the waveguide of the NMR via the two-defect and uniform gratings. The resonant outputs from the two-defect gratings are propagated through the NMR and grating, where the delay times of pulses with different wavelengths through the system are obtained and distinguished by the output grating (uniform grating). From the obtained resonant outputs, we found that the redshifted and blueshifted (Cerenkov radiation) signals occurred and were seen. In applications, such a proposed system can be used to form two different optical trapping probes, where the trapped photons can be propagated by the modulated light pulse within the device, while the Cerenkov radiation of the trapped atoms or molecules within the system can be useful for Cerenkov radiation investigation, imaging, and sensing applications.