The Design and Characterization of an Ultra-Compact Asymmetrical Multimode Interference Splitter on Lithium Niobate Thin Film

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-01-05 DOI:10.3390/photonics11010060

Dechen Li, Jinye Li, Run Li, Jianguo Liu

引用次数: 0

Abstract

We propose and demonstrate a high-performance asymmetrical multimode interference splitter on X-cut lithium niobate on insulator (LNOI) with an ultra-compact size of 5.8 μm × (26.4–35.6) μm. A rectangle with a small region is removed from the upper left corner of the multimode interference (MMI) coupler to achieve a variable splitting ratio. Here, we design and characterize MMIs in six different distribution ratios ranging from 50:50 to 95:5 on a 600 nm thick LNOI. Based on the cascade structure, the linear fitting method accurately shows the device loss (~0.1–0.9 dB). Our fabricated devices demonstrate robustness across a 30 nm optical bandwidth (1535–1565 nm). In addition, we numerically simulate the Z-cut LNOI, showing that the structure corresponding to the TM mode can also achieve a good variable splitting ratio.

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铌酸锂薄膜超小型非对称多模干涉分光器的设计与特性分析

我们在 X 切面绝缘铌酸锂 (LNOI) 上提出并演示了一种高性能非对称多模干涉分路器，它具有 5.8 μm × (26.4-35.6) μm 的超紧凑尺寸。多模干涉（MMI）耦合器的左上角去掉了一个带小区域的矩形，以实现可变的分光比。在此，我们在 600 nm 厚的 LNOI 上设计了六种不同分配比例的多模干涉耦合器，分配比例从 50:50 到 95:5。基于级联结构，线性拟合方法准确地显示了器件损耗（~0.1-0.9 dB）。我们制造的器件在 30 nm 的光带宽（1535-1565 nm）范围内表现出稳健性。此外，我们还对 Z 切 LNOI 进行了数值模拟，结果表明与 TM 模式相对应的结构也能实现良好的可变分光比。

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

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.