On-chip broadband power splitters via non-Hermitian subspaces.

IF 3.1 2区 物理与天体物理 Q2 OPTICS
Optics letters Pub Date : 2025-04-01 DOI:10.1364/OL.559011
Xiaohong Li, Zhiqiang Qi, Hongyu Tan, Yang Liu, Lu Ding, Shaolin Ke
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引用次数: 0

Abstract

We propose and demonstrate a broadband 3-dB power splitter based on a non-Hermitian triplet waveguide fabricated on a silicon-on-insulator (SOI) platform. By exploiting mirror symmetry, we show that the triplet can be decoupled into two virtual subspaces: a Hermitian subspace featuring a lossless zero mode and a non-Hermitian subspace supporting lossy modes. The zero mode, with its intensity equally distributed between the outer two waveguides, plays a crucial role in achieving broadband performance, effectively suppressing mode competition and maintaining stable splitting against dimensional errors. Experimentally, the 1-dB operational bandwidth of the splitter is confirmed to exceed 70 nm, ranging from 1480 nm to 1550 nm. Furthermore, this approach can be directly extended to any 1×n power splitter, providing a scalable and robust solution for photonic integration.

通过非厄米子空间的片上宽带功率分配器。
我们提出并演示了一种基于非厄米三重态波导的宽带3db功率分路器,该波导是在绝缘体上硅(SOI)平台上制造的。通过利用镜像对称性,我们证明了三重态可以解耦成两个虚子空间:具有无损零模的厄米子空间和支持有损模的非厄米子空间。零模式,其强度均匀分布在外两个波导之间,在实现宽带性能,有效地抑制模式竞争和保持稳定的分裂对尺寸误差至关重要。实验证实,该分光器的1 db工作带宽在1480 ~ 1550 nm之间,超过70 nm。此外,这种方法可以直接扩展到任何1×n功率分配器,为光子集成提供可扩展和健壮的解决方案。
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来源期刊
Optics letters
Optics letters 物理-光学
CiteScore
6.60
自引率
8.30%
发文量
2275
审稿时长
1.7 months
期刊介绍: The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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