Opt Lett. 2018 May 15;43(10):2276-2279. doi: 10.1364/OL.43.002276.
Weighted addition is an elemental multi-input to single-output operation that can be implemented with high-performance photonic devices. Microring (MRR) weight banks bring programmable weighted addition to silicon photonics. Prior work showed that their channel limits are affected by coherent inter-channel effects that occur uniquely in weight banks. We fabricate two-pole designs that exploit this inter-channel interference in a way that is robust to dynamic tuning and fabrication variation. Scaling analysis predicts a channel count improvement of 3.4-fold, which is substantially greater than predicted by incoherent analysis used in conventional MRR devices. Advances in weight bank design expand the potential of reconfigurable analog photonic networks and multivariate microwave photonics.
加权加法是一种基本的多输入单输出操作，可以通过高性能的光子器件来实现。微环（MRR）权重库为硅光子学带来了可编程加权加法。之前的工作表明，它们的信道限制受到信道间相干效应的影响，而这种效应在权重库中是独特存在的。我们设计了两种极点设计，以一种对动态调谐和制造变化具有鲁棒性的方式利用这种信道间干扰。缩放分析预测信道数量的改善将达到 3.4 倍，这明显大于传统 MRR 器件中使用的非相干分析所预测的结果。权重库设计的进步扩展了可重构模拟光子网络和多元微波光子学的潜力。
