Ultrasmall Four-Channel Multiplexer Designed by Bayesian Direct Binary Search Method

IF 2.4 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2026-02-10 DOI:10.1109/LPT.2026.3663414

Yusuke Sawada;Takeshi Fujisawa;Takuya Mitarai;Kento Komatsu;Takuya Okimoto;Takuo Hiratani;Hideki Yagi;Naoki Fujiwara

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引用次数: 0

Abstract

We propose two kinds of mosaic-based four-channel multiplexers operating with 20-nm channel spacing in the C- and O-bands, respectively. Mosaic devices feature a complex refractive-index distribution including etched holes. A triangular lattice is introduced to maximize the hole density per area and facilitate fabrication. The hole configurations are optimized using the Bayesian direct binary search method. The multiplexers are the smallest among those validated through experimental demonstration with 20-nm channel spacing. The C-band multiplexer exhibits a low insertion loss of 3 dB and dimensions of

$13.8~\mu \mathrm{m} \times 7.58~\mu $

m. Tolerance analyses indicate that spectral shifts caused by waveguide width deviations is 1/10 of that caused by hole diameter deviations. The O-band multiplexer, suitable for coarse wavelength division multiplexing systems, exhibits an insertion loss of 3.6 dB and dimensions of

$12.7~\mu \mathrm{m} \times 7.9~\mu $

m. Mosaic devices are a powerful option as ultrasmall passive components for large-scale photonic integrated circuits.

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基于贝叶斯直接二叉搜索的超小四路复用器设计

我们提出了两种基于马赛克的四通道多路复用器，分别在C波段和o波段工作，通道间距为20nm。马赛克装置具有复杂的折射率分布，包括蚀刻孔。三角形晶格的引入使每个区域的孔密度最大化，便于制造。采用贝叶斯直接二叉搜索法对孔结构进行优化。通过实验验证，该多路复用器的通道间距为20nm，是最小的。c波段复用器的插入损耗低至3db，尺寸为$13.8~\mu \ mathm {m} × 7.58~\mu $ m。容差分析表明，波导宽度偏差引起的频谱偏移是孔径偏差引起的光谱偏移的1/10。该o波段多路复用器适用于粗波分多路复用系统，其插入损耗为3.6 dB，尺寸为12.7~\ mathrm{m} × 7.9~\mu $ m。镶嵌器件是用于大规模光子集成电路的超小型无源器件的有力选择。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.