We present a study of the effect of imperfections on the transmission and crosstalk in programmable photonic meshes with feedback loops consisting of tunable couplers and phase shifters.The many elements in such a mes...We present a study of the effect of imperfections on the transmission and crosstalk in programmable photonic meshes with feedback loops consisting of tunable couplers and phase shifters.The many elements in such a mesh can generate a multitude of parasitic paths when the couplers and phase shifters deviate even slightly from their nominal value.Performing Monte Carlo simulations,we show that small stochastic imperfections in the phase and coupling(<1.0%)can introduce unwanted interferences and resonances and significantly deteriorate the frequency response of the circuit.We also demonstrate that,in the presence of imperfections,the programming strategy of the unused couplers can reduce effects of such parasitics.展开更多
We experimentally demonstrate extraction of silicon waveguide geometry with subnanometer accuracy using optical measurements. Effective and group indices of silicon-on-insulator(SOI) waveguides are extracted from the ...We experimentally demonstrate extraction of silicon waveguide geometry with subnanometer accuracy using optical measurements. Effective and group indices of silicon-on-insulator(SOI) waveguides are extracted from the optical measurements. An accurate model linking the geometry of an SOI waveguide to its effective and group indices is used to extract the linewidths and thicknesses within respective errors of 0.37 and0.26 nm on a die fabricated by IMEC multiproject wafer services. A detailed analysis of the setting of the bounds for the effective and group indices is presented to get the right extraction with improved accuracy.展开更多
基金European Research Council(780283-MORPHIC)Horizon 2020 Framework Programme(725555-Photonic SWARM)。
文摘We present a study of the effect of imperfections on the transmission and crosstalk in programmable photonic meshes with feedback loops consisting of tunable couplers and phase shifters.The many elements in such a mesh can generate a multitude of parasitic paths when the couplers and phase shifters deviate even slightly from their nominal value.Performing Monte Carlo simulations,we show that small stochastic imperfections in the phase and coupling(<1.0%)can introduce unwanted interferences and resonances and significantly deteriorate the frequency response of the circuit.We also demonstrate that,in the presence of imperfections,the programming strategy of the unused couplers can reduce effects of such parasitics.
基金Fonds Wetenschappelijk Onderzoek(FWO)(G013815N)Agentschap Innoveren en Ondernemen(VLAIO)
文摘We experimentally demonstrate extraction of silicon waveguide geometry with subnanometer accuracy using optical measurements. Effective and group indices of silicon-on-insulator(SOI) waveguides are extracted from the optical measurements. An accurate model linking the geometry of an SOI waveguide to its effective and group indices is used to extract the linewidths and thicknesses within respective errors of 0.37 and0.26 nm on a die fabricated by IMEC multiproject wafer services. A detailed analysis of the setting of the bounds for the effective and group indices is presented to get the right extraction with improved accuracy.
