缩放比例
光子学
炸薯条
计算机科学
电子工程
并行计算
物理
光电子学
工程类
电信
数学
几何学
作者
Tatsuhiro Onodera,Martin M. Stein,Benjamin A. Ash,Mandar M. Sohoni,Melissa Bosch,Ryotatsu Yanagimoto,Marc Jankowski,Timothy P. McKenna,Tianyu Wang,Gennady Shvets,Maxim R. Shcherbakov,Logan G. Wright,Peter L. McMahon
出处
期刊:Cornell University - arXiv
日期:2024-02-27
被引量:1
标识
DOI:10.48550/arxiv.2402.17750
摘要
On-chip photonic processors for neural networks have potential benefits in both speed and energy efficiency but have not yet reached the scale at which they can outperform electronic processors. The dominant paradigm for designing on-chip photonics is to make networks of relatively bulky discrete components connected by one-dimensional waveguides. A far more compact alternative is to avoid explicitly defining any components and instead sculpt the continuous substrate of the photonic processor to directly perform the computation using waves freely propagating in two dimensions. We propose and demonstrate a device whose refractive index as a function of space, $n(x,z)$, can be rapidly reprogrammed, allowing arbitrary control over the wave propagation in the device. Our device, a 2D-programmable waveguide, combines photoconductive gain with the electro-optic effect to achieve massively parallel modulation of the refractive index of a slab waveguide, with an index modulation depth of $10^{-3}$ and approximately $10^4$ programmable degrees of freedom. We used a prototype device with a functional area of $12\,\text{mm}^2$ to perform neural-network inference with up to 49-dimensional input vectors in a single pass, achieving 96% accuracy on vowel classification and 86% accuracy on $7 \times 7$-pixel MNIST handwritten-digit classification. This is a scale beyond that of previous photonic chips relying on discrete components, illustrating the benefit of the continuous-waves paradigm. In principle, with large enough chip area, the reprogrammability of the device's refractive index distribution enables the reconfigurable realization of any passive, linear photonic circuit or device. This promises the development of more compact and versatile photonic systems for a wide range of applications, including optical processing, smart sensing, spectroscopy, and optical communications.
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