Microwave Photonic Research Laboratory, School of Electrical Engineering and Computer Science, University of Ottawa, 25 Templeton Street, Ottawa, ON, K1N 6N5, Canada.
Nat Commun. 2018 Apr 11;9(1):1396. doi: 10.1038/s41467-018-03738-3.
Since the discovery of the Bragg's law in 1913, Bragg gratings have become important optical devices and have been extensively used in various systems. In particular, the successful inscription of a Bragg grating in a fiber core has significantly boosted its engineering applications. However, a conventional grating device is usually designed for a particular use, which limits general-purpose applications since its index modulation profile is fixed after fabrication. In this article, we propose to implement a fully reconfigurable grating, which is fast and electrically reconfigurable by field programming. The concept is verified by fabricating an integrated grating on a silicon-on-insulator platform, which is employed as a programmable signal processor to perform multiple signal processing functions including temporal differentiation, microwave time delay, and frequency identification. The availability of ultrafast and reconfigurable gratings opens new avenues for programmable optical signal processing at the speed of light.
自 1913 年布拉格定律发现以来，布拉格光栅已成为重要的光学器件，并广泛应用于各种系统中。特别是在光纤芯中成功写入布拉格光栅，极大地推动了其工程应用。然而，传统的光栅器件通常是针对特定用途设计的，由于其折射率调制轮廓在制造后固定不变，因此限制了其通用应用。在本文中，我们提出了一种完全可重构的光栅，通过现场编程实现快速和电可重构。这一概念通过在绝缘体上硅平台上制造集成光栅得到了验证，该光栅可用作可编程信号处理器，执行多个信号处理功能，包括时间微分、微波延时和频率识别。超快和可重构光栅的出现为以光速进行可编程光信号处理开辟了新途径。
