啁啾布拉格光栅作为无源光子储备池：时间信息处理的实验概念验证
Chirped Bragg Gratings as Passive Photonic Reservoirs: An Experimental Proof-of-Concept for Temporal Information Processing
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中文总结 AI 辅助
本研究通过实验测量硅光子啁啾布拉格光栅的群延迟和反射系数，验证其具备分布式延迟、衰减记忆和时间混合等特性，可作为无源光子储备池进行时间信息处理。
中文摘要 AI 辅助
无源光子结构通过利用固有的光传播、延迟、干涉和记忆效应进行时间信息处理，为储备池计算提供了一条潜在途径。本研究探讨啁啾布拉格光栅（CBG）是否能展现出与无源光子储备池相关的基本物理特性。该研究并非将CBG作为一个完整的储备池计算机来呈现，而是基于实验测量的器件特性，提供早期概念验证评估。从硅光子CBG获得的波长相关群延迟和反射系数测量结果被纳入一个分布式延迟模型中，其中多个延迟贡献形成储备池状态。使用基于标准记忆容量公式的线性读出，对所得系统在分布式延迟、衰减记忆、时间混合和记忆容量方面进行了检验。结果表明，所测量的CBG响应在实验观察到的延迟范围内提供了分布式时间记忆，并通过多个延迟贡献的叠加产生时间混合。记忆容量分析进一步表明，过去的输入符号可以从分布式延迟状态中重建，为所测CBG响应中的时间信息保留提供了定量证据。这些结果表明，无源CBG具有与储备池计算相关的若干物理特性，因此可能为类储备池时间处理提供一种简单的光子基底。该研究旨在作为初步概念验证，为未来对基于无源CBG的光子储备池进行实验和特定任务研究奠定基础。
英文摘要
Passive photonic structures offer a potential route toward reservoir computing by exploiting intrinsic optical propagation, delay, interference, and memory effects for temporal information processing. This work investigates whether a chirped Bragg grating (CBG) can exhibit fundamental physical properties relevant to a passive photonic reservoir. Rather than presenting the CBG as a complete reservoir computer, the study provides an early proof-of-concept assessment based on experimentally measured device characteristics. Wavelength-dependent group delay and reflection coefficient measurements obtained from a silicon photonic CBG are incorporated into a distributed delay model in which multiple delayed contributions form the reservoir states. The resulting system is examined with respect to distributed delay, fading memory, temporal mixing, and memory capacity using a linear readout based on the standard memory capacity formulation. The results demonstrate that the measured CBG response provides a distributed temporal memory over the experimentally observed delay range and produces temporal mixing through the superposition of multiple delayed contributions. The memory capacity analysis further indicates that past input symbols can be reconstructed from the distributed delay states, providing quantitative evidence of temporal information retention in the measured CBG response. These results suggest that a passive CBG possesses several physical characteristics relevant to reservoir computing and may therefore provide a simple photonic substrate for reservoir-like temporal processing. The study is intended as an initial proof-of-concept, providing a foundation for future experimental and task specific investigations of passive CBG-based photonic reservoirs.
发表机构
- University of Parma（帕尔马大学）
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