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arXiv 2307.16639physics.opticsphysics.app-ph
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硅光子学模式可选移相器

Silicon Photonics Mode-Selective Phase Shifter

Seyed Mohammad Reza Safaee, Kaveh, Rahbardar Mojaver, Guowu Zhang, Odile Liboiron-Ladouceur

AI总结:

本文提出并实验演示了基于亚波长光栅的硅光子模式可选热光移相器,实现对TE0和TE1模式的直接相位操控,在模分复用系统中具有广泛的应用潜力。

摘要:

提出了一种由亚波长光栅(SWG)结构使能的新型模式可选热光移相器(MS-TOPS),并在220 nm波导厚度的硅光子芯片上对前两个准横电模(TE0、TE1)进行了实验演示。模式的模式可选相对相位操控解锁了模分复用系统中的若干处理任务。这种集成解决方案提供了对模式的直接相位操控,而无需将其转换为其基模。部署了马赫-曾德尔干涉仪作为测试结构,在一个臂中包含所提出的MS-TOPS,在另一个臂中包含模式不敏感热光移相器(MI-TOPS)。通过数值模拟和实验测量研究了SWG占空比的影响。实验演示了1.44的模式选择性。换言之,TE0的热光系数比TE1大44%。该移相器的插入损耗最高为2.5 dB,在1520至1560 nm的40 nm波长范围内,最坏情况下的串扰为-13.1 dB。所提出的MS-TOPS与MI-TOPS的级联配置提供了足够的自由度来独立操控每个模式的相对相位。此类器件的众多潜在应用包括光开关、多模量子光学处理器,以及通过模式可选构建块扩展传统光学处理器。

英文摘要:

A novel mode-selective thermo-optic phase shifter (MS-TOPS) enabled by subwavelength grating (SWG) structures is proposed and experimentally demonstrated on a 220 nm waveguide thick silicon photonics chip for the first two quasi-transverse electric modes (TE0, TE1). Mode-selective relative phase manipulation of modes unlocks several processing tasks in mode division multiplexing systems. This integrated solution provides a direct phase manipulation of modes without converting them to their fundamental modes. A Mach-Zehnder interferometer is deployed as a test structure incorporating the proposed MS-TOPS in one arm and a mode-insensitive thermo-optic phase shifter (MI-TOPS) in another. The effect of the SWG duty cycle ratio is investigated by both numerical simulations and experimental measurements. A mode-selectivity of 1.44 is experimentally demonstrated. In other words, the thermo-optic coefficient of TE0 is 44% larger than the one for TE1. The phase shifter's insertion loss is at most 2.5 dB and a worst-case crosstalk of -13.1 dB over a 40 nm wavelength range from 1520 to 1560 nm. A cascaded configuration of the proposed MS-TOPS and an MI-TOPS provides sufficient degrees of freedom to manipulate the relative phase of each mode independently. Potential numerous applications of such devices include optical switching, multimode quantum optical processors, and scaling-up conventional optical processors with a mode selective building block.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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