Polarization-insensitive 90° optical hybrid on the thin-film lithium niobate platform.

IF 3.3 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-07-01 DOI:10.1364/OL.559388

Yuqiong Chen, Haolei Feng, Qianqian Jia, Jianguo Liu, Yujie Lu, Jing Zhang, Jinye Li

引用次数: 0

Abstract

We propose a simple polarization-insensitive 90° optical hybrid on the thin-film lithium niobate (TFLN) platform. The design comprises one 1 × 2 multimode interference (MMI) coupler, three 2 × 2 MMI couplers, and crossing waveguides, effectively reducing the excitation of higher-order modes. By optimizing the length of the 2 × 2 MMI to balance the beat length difference between transverse electric (TE) and transverse magnetic (TM) modes, polarization-insensitive transmission across the entire C-band was achieved. The device exhibits a <5° phase error for TE/TM modes, a <1 dB excess loss, and a >34 dB common-mode rejection ratio (CMRR) over the 1530-1565 nm range. Capable of direct integration with on-chip photodetectors (PDs), this design holds significant potential for applications in coherent receivers integrated with polarization-division multiplexing (PDM).

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铌酸锂薄膜平台上偏光不敏感的90°光学杂化。

我们在薄膜铌酸锂（TFLN）平台上提出了一个简单的偏振不敏感的90°光学杂化。该设计由1个1 × 2多模干涉（MMI）耦合器、3个2 × 2多模干涉耦合器和交叉波导组成，有效降低了高阶模的激发。通过优化2 × 2 MMI的长度来平衡横向电（TE）和横向磁（TM）模式之间的拍长差异，实现了整个c波段的极化不敏感传输。该器件在1530-1565 nm范围内具有34 dB的共模抑制比（CMRR）。该设计能够与片上光电探测器（PDs）直接集成，在与偏振分复用（PDM）集成的相干接收器中具有重要的应用潜力。

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

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.