Compact high-extinction tunable CROW filters for integrated quantum photonic circuits
Rakesh Ranjan Kumar, Xinru Wu, Hon Ki Tsang
Abstract
We describe the use of cascaded second-order coupled-resonator optical waveguide (CROW) tunable filters to achieve one of the highest reported measured extinction ratios of $ {\gt} {110}\;{\rm dB}$>110dB. The CROW filters were used to remove the pump photons in spontaneous four-wave mixing (SFWM) in a silicon waveguide. The SFWM generated quantum-correlated photons that could be measured after the cascaded CROW filters. The CROW filters offer a compact footprint for use in monolithic quantum photonic circuits.
Topics & Concepts
OpticsPhotonResonatorPhotonic integrated circuitWaveguidePhotonicsExtinction ratioPhysicsElectronic circuitPhoton countingQuantum opticsOptoelectronicsOptical filterExtinction (optical mineralogy)Quantum mechanicsWavelengthPhotonic and Optical DevicesOptical Network TechnologiesAdvanced Photonic Communication Systems