基于50GHz FSR光学孤子晶体Kerr微梳的高性能光子微波滤波器

D. Moss
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引用次数: 8

摘要

我们展示了一种基于集成光学微梳源的光子射频(RF)横向滤波器,该滤波器具有创纪录的49 GHz低自由频谱范围,在c波段产生80条微梳线。这种创纪录的抽头数量或横向滤波器的波长导致性能显着提高,包括QRF因子比以前的结果高出四倍以上。此外,通过采用正抽头和负抽头,改进的带外抑制高达48.9 dB,使用高斯离形,以及覆盖RF频谱范围的可调谐中心频率,具有广泛可调的3db带宽和多种动态可调滤波器形状。我们的实验结果与理论吻合良好,表明我们的横向滤波器是实现先进自适应RF滤波器的有竞争力的解决方案,具有宽操作带宽,高频率选择性,高可重构性,并可能降低成本和占地面积。这种方法在现代雷达和通信系统中有很好的应用前景。
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High performance photonic microwave filters based on a 50GHz FSR optical soliton crystal Kerr micro-comb
We demonstrate a photonic radio frequency (RF) transversal filter based on an integrated optical micro-comb source featuring a record low free spectral range of 49 GHz yielding 80 micro-comb lines across the C-band. This record-high number of taps, or wavelengths for the transversal filter results in significantly increased performance including a QRF factor more than four times higher than previous results. Further, by employing both positive and negative taps, an improved out-of-band rejection of up to 48.9 dB is demonstrated using Gaussian apodization, together with a tunable centre frequency covering the RF spectra range, with a widely tunable 3-dB bandwidth and versatile dynamically adjustable filter shapes. Our experimental results match well with theory, showing that our transversal filter is a competitive solution to implement advanced adaptive RF filters with broad operational bandwidths, high frequency selectivity, high reconfigurability, and potentially reduced cost and footprint. This approach is promising for applications in modern radar and communications systems.
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