混合集成现场可编程时域隐身器件基础研究

Temporal cloak programmable is a major breakthrough in temporal cloak, since the fantastic concept of temporal cloak was first theoretically proposed in 2011. Field-programmable temporal cloak has wide applications in the areas of information security and confidential communications. Moreover, the the field-programmable temporal cloak with high integration and high cloak on-off contrast has become the current research hard point and hot spot. This project will investigate the hybrid integrated field-programmable temporal cloak device. Novel mechanism of linear chirp generated by filtering of a broadband flat optical frequency comb will be studied to analyze the the effects of micro-ring resonant bandpass filtering, tuning characteristics and peak power consistency on the performance of the time lens, and to create highly integrated and high performance field-programmable temporal cloak. In order to realize the dual characteristics that are the resonance wavelength of the electrically tuned microring resonator (ET-MRR) changes linearly with the driving voltage, and the resonance peak power does not change with the driving voltage, the compound waveguide with the combination of silicon waveguide and lithium niobate waveguide will be researched. We will study the component fabrication of the silicon and lithium niobate compound waveguide resonators to develop a monolithic hybrid integrated time lens combined with an ET-MRR and an optical frequency comb generator. We will finally experimentally investigate field-programmable temporal cloak. This research project provides an effective approach to implement the hybrid integrated field programmable temporal cloak chip.

时域隐身现场可编程是时域隐身2011年首次提出以来的又一重大突破，在信息安全和保密通信等领域有着重要的应用价值，而高显隐对比度高集成度的现场可编程时域隐身已成为当前研究的难点与热点。本项目拟对混合集成现场可编程时域隐身器件的基础问题展开研究。研究在斜坡电压驱动下电调微环谐振器对光频梳实时筛选获得线性啁啾的新机理，分析微环谐振器带通滤波性能、调谐特性和峰值功率一致性对时域透镜性能的影响，设计出高度集成、高性能的现场可编程时域隐身。研究硅波导和铌酸锂波导相结合的混合波导，克服硅基电调微环因载流子效应这一非线性效应产生的若干缺陷，实现电调微环的谐振波长随驱动电压线性变化、峰值功率不随驱动电压变化的优越特性。研究硅和铌酸锂混合波导谐振器的制备工艺，制备出混合集成电调微环与相位型光频梳发生器单片集成的时域透镜，实验验证和优化现场可编程时域隐身，为实现现场可编程时域隐身芯片提供一条混合集成的有效途径。

时域隐身在不占数据位的光开关、无中断的中断、增强通信能力、因果编辑器等领域具有重要的应用价值，新构建的现场可编程时域隐身更是掀起了时域隐身的研究热潮。本项目创新性地提出了基于混合集成微环谐振器的现场可编程时域隐身新方案，具体研究成果包括如下内容：基于混合集成扫频滤波型时域透镜，设计并实验实现了大有效隐身窗口的现场可编程时域隐身。在实验上打开了3.5ns的有效隐身窗口，实验验证了有效隐身窗口开关在线可编程的时域隐身系统，这使得利用该系统应用至数据盾中，可在硬件上实现公共数据的共享而对私人数据进行保密。此外，对涡旋光束进行精准的非均匀部分相干调控，使得光束的闪烁指数降低至完全相干的15%、接收能量峰值大小接近入射光束能量的2.8倍、信噪比增加5.3dB，说明对涡旋光束进行精准的非均匀部分相干调控，能使光束兼顾低闪烁、高信噪比和高接收能量等特性。针对畸变的复用涡旋光束，构建无波前传感涡旋光束的波前校正。采用两种评价函数的SPGD和遗传算法对单模和多模涡旋光束进行了校正，对较强畸变多模光束，遗传算法和以螺旋谱模式纯度的SPGD算法都能获得模式纯度低于0.05的偏差。实现了高质量的无波前传感涡旋光束的波前校正。