Kumar Rakesh Ranjan, Tsang Hon Ki
Opt Lett. 2021 Jan 1;46(1):134-137. doi: 10.1364/OL.409784.
We report an integrated tunable-bandwidth optical filter with a passband to stop-band ratio of over 96 dB using a single silicon chip with an ultra-compact footprint. The integrated filter is used in filtering out the pump photons in non-degenerate spontaneous four-wave mixing (SFWM), which is used for producing correlated photon pairs at different wavelengths. SFWM occurs in a long silicon waveguide, and two cascaded second-order coupled-resonator optical waveguide (CROW) filters were used to spectrally remove the pump photons. The tunable bandwidth of the filter is useful to adjust the coherence time of the quantum correlated photons and may find applications in large-scale integrated quantum photonic circuits.
我们报道了一种集成可调带宽光学滤波器，它采用具有超紧凑占位面积的单个硅芯片，通带与阻带之比超过96 dB。该集成滤波器用于在非简并自发四波混频（SFWM）中滤除泵浦光子，SFWM用于产生不同波长的关联光子对。SFWM发生在长硅波导中，使用两个级联的二阶耦合谐振器光波导（CROW）滤波器在光谱上移除泵浦光子。该滤波器的可调带宽有助于调整量子关联光子的相干时间，并可能在大规模集成量子光子电路中得到应用。
