García Sergi, Ureña Mario, Gasulla Ivana
ITEAM Research Institute, Universitat Politècnica de València, Valencia, 46022, Spain.
ACS Photonics. 2022 Aug 17;9(8):2850-2859. doi: 10.1021/acsphotonics.2c00910. Epub 2022 Aug 4.
Beyond playing a primary role in high-capacity communication networks, multicore optical fibers can bring many advantages to optical and microwave signal processing, as not only space but also chromatic dispersion are introduced as new degrees of freedom. The key lies in developing radically new multicore fibers where the refractive index profile of each individual core is tailored properly to provide parallel dispersion-diversity signal processing with application in a variety of scenarios such as parallel channel equalization, analogue-to-digital conversion, optical computing, pulse generation and shaping, multiparameter fiber sensing, medical imaging, optical coherence tomography, broadband measurement instrumentation, and next-generation fiber-wireless communications. Here, we experimentally prove, for the first time to our knowledge, reconfigurable two-dimensional dispersion-managed signal processing performed by a novel dispersion-diversity heterogeneous multicore fiber. The fiber comprises seven different trench-assisted cores featuring a different refractive index profile in terms of both radial geometry and core dopant concentration. As a representative application case, we demonstrate reconfigurable microwave signal filtering with increased compactness as well as performance flexibility and versatility as compared to previous technologies.
除了在高容量通信网络中发挥主要作用外，多芯光纤还可为光信号和微波信号处理带来诸多优势，因为不仅空间，而且色度色散都被引入作为新的自由度。关键在于开发全新的多芯光纤，其中每个单芯的折射率分布都经过适当调整，以提供并行色散分集信号处理，并应用于各种场景，如并行通道均衡、模数转换、光计算、脉冲产生与整形、多参数光纤传感、医学成像、光学相干断层扫描、宽带测量仪器以及下一代光纤无线通信。在此，据我们所知，我们首次通过实验证明了由一种新型色散分集异质多芯光纤执行的可重构二维色散管理信号处理。该光纤由七个不同的沟槽辅助芯组成，这些芯在径向几何形状和芯掺杂浓度方面具有不同的折射率分布。作为一个具有代表性的应用案例，我们展示了与先前技术相比具有更高紧凑性以及性能灵活性和通用性的可重构微波信号滤波。
