This report is on an NSF-funded project [0642603], which is a five-year (60 months) CAREER (Faculty Early Career Development Program) unified research and education development program, with the full title “CAREER: Chip-scale low-power nonlinear optics using coupled resonators and CROWs”. CROW is an acronym for Coupled Resonator Optical Waveguide. The focus of this project is a study of waveguiding and potential applications of the CROW structure. Its unique light-guiding and dispersion properties may make it useful for nonlinear optics using integrated semiconductor devices. This, in turn, could be beneficial for optical communications and all-optical signal processing at the milliwatt-scale power level, as is typically used in practical communication networks, and allow more intelligent optical networks. In contrast, nonlinear optics is traditionally studied in table-top or breadboard experiments using dielectric crystals or long lengths of fiber (glass) at much higher power levels.
This NSF-funded project [0642603] is a five-year (60 months) CAREER (Faculty Early Career Development Program) unified research and education development program, with a focus on the physics and applications of nonlinear optics in the CROW (Coupled Resonator Optical Waveguide) device structure. In wavelength conversion, the optical output power at the new wavelength (i.e., the idler) depends quadratically on the propagation length (in the low power regime). It is important to realize long CROW structures which requires designing slow-light waveguides with low loss and low disorder. As studied here, the fabrication of low-loss slow-light waveguides can be challenging due to several factors, including material losses, fabrication imperfections, and scattering losses.
This NSF-funded project [0642603] is a five-year (60 months) CAREER (Faculty Early Career Development Program) unified research and education development program. The project outcomes include the realization of record-length coupled-resonator optical waveguide structures, and achieving the highest four-wave mixing (FWM) wavelength conversion. Both intra-band and inter-band FWM were studied and the results are compared. Furthermore, detailed studies of light propagation were performed to understand the effects of disorder on light propagation.
This NSF-funded project [0642603] is a five-year (60 months) CAREER (Faculty Early Career Development Program) unified research and education development program, which focused on the physics and applications of optical waveguiding in the CROW (Coupled Resonator Optical Waveguide) structure. This structure offers a very high four-wave mixing (FWM) nonlinearity based on the slow-light effects on each of the pump, signal and idler modes. The triple resonance effects can result in a large improvement of the nonlinear coefficient even with a modest improvement of the slowing factor, and despite the inevitable presence of optical loss. However, understanding the effects of disorder in CROWs is important, since it can limit the amount of slowing that can be achieved, and hence, the enhancement of slow-light enhanced nonlinearity.
This NSF-funded project [0642603] is a five-year (60 months) CAREER (Faculty Early Career Development Program) unified research and education development program. The project’s focus is the study of low-power (milliwatt class) nonlinear optics using a novel type of waveguide, the Coupled Resonator Optical Waveguide (CROW), which can greatly increase the conversion efficiency over conventional waveguides, and support much wider bandwidths than single micro-resonators. Examples of the nonlinear effects that were studied in this project are wavelength conversion of high speed data-modulated signals and correlated photon-pair generation at room temperature in a compact device with low pump power requirements.
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