LNOI 上用于偏振处理和复用的各向异性热光马赫-曾德尔干涉仪,Laser & Photonics Reviews

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LNOI 上用于偏振处理和复用的各向异性热光马赫-曾德尔干涉仪
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2023-05-12 , DOI: 10.1002/lpor.202300025
Lijia Song _{1,

2} , Weixi Liu _{1,

2} , Zehao Guo ₁ , Hanwen Li ₁ , Yiwei Xie _{1,

3} , Zejie Yu _{1,

3} , Huan Li _{1,

3} , Yaocheng Shi _{1,

2,

3} , Daoxin Dai _{1,

2,

3}

Affiliation

绝缘体上薄膜铌酸锂（LN）（LNOI）正在成为一种有前景的集成光子平台。LNOI 上的热光 (TO) 马赫-曾德尔干涉仪 (MZI) 被证明是一种可行且通常首选的电光干涉仪替代品，适用于稳定性和可重复性至关重要的低速和静态应用。利用 LN 独特且强大的各向异性 TO 效应，提出并实验实现了一种新颖且通用的x切 LNOI上的各向异性 TO MZI，用于偏振处理和复用。每个 MZI 臂均由沿y和z方向的两部分各向异性 TO 移相器组成-LN 晶体的方向，导致横向电 (TE) 和横向磁 (TM) 偏振的有效折射率具有各向异性温度依赖性。MZI 器件实现了偏振不敏感开关和偏振分束器，其在电信 C 波段（1530-1565 nm）中具有约 0.2-1.8 dB 的低超损耗和约 20-45 dB 的高消光比。）。更有趣的是，可以进一步同时对两个偏振实现任意分光比，甚至酉传输矩阵的任意组合。这种各向异性 TO MZI 的多功能配置对于大规模光子计算和互连具有重要意义。

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Anisotropic Thermo-Optic Mach–Zehnder Interferometer on LNOI for Polarization Handling and Multiplexing

Thin-film lithium niobate (LN) on insulator (LNOI) is emerging as a promising integrated photonic platform. Thermo-optic (TO) Mach–Zehnder interferometers (MZIs) on LNOI are demonstrated to be a viable and often preferred alternative to their electro-optic counterparts for low-speed and static applications, where stability and repeatability are crucial. Harnessing the unique and strong anisotropic TO effect of LN, a novel and versatile anisotropic TO MZI on x-cut LNOI for polarization handling and multiplexing is proposed and experimentally implemented. Each MZI arm consists of a two-section anisotropic TO phase shifter along the y- and z-directions of the LN crystal, leading to anisotropic temperature dependence of the effective refractive indices for the transverse-electric (TE) and transverse-magnetic (TM) polarizations. A polarization-insensitive switch and a polarization beam splitter are implemented with the MZI device, which features low excess loss of ≈0.2–1.8 dB and a high extinction ratio of ≈20–45 dB in the telecom C-band (1530–1565 nm). More intriguingly, arbitrary splitting ratios and even arbitrary combinations of unitary transmission matrices can be further implemented for both polarizations simultaneously. The versatile configurations of this anisotropic TO MZI have important implications for large-scale photonic computing and interconnect.

更新日期：2023-05-12

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