Siyuan Wang, Hongxuan Liu, Mai Wang, Hao Chen, Zhi Ma, Bingcheng Pan, Yishu Huang, Yaqi Shi, Chenlei Li, He Gao, Yeyu Tong, Zongyin Yang, Zejie Yu, Liu Liu, Daoxin Dai
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引用次数: 0
摘要
群速度和阻抗匹配是高速马赫-泽恩德光电(EO)调制器的先决条件。然而,并非所有平台都能实现匹配条件,这限制了许多实际条件下的高速调制。在此,我们提出并演示了一种准匹配方案,通过级联快波和慢波行波电极来满足群速度和特性阻抗的匹配。通过改变快波和慢波行波电极的比例,可以灵活调整有效群速度。此外,通过在带有二氧化硅包层的绝缘体铌酸锂薄膜平台上演示 6 毫米长的 EO 调制器,实验验证了准匹配方案。慢波电极和快波电极边界处的射频信号插入损耗小于 0.12 dB。准匹配 EO 调制器的测量小信号 EO 响应在 67 GHz 时下降不到 2 dB,而传统慢速和快速行波 EO 调制器的测量小信号 EO 响应在 67 GHz 时下降了 4 dB。准匹配 EO 调制器的 100 Gb/s 开关关键信号眼图测量结果也比传统方案具有压倒性优势。因此,我们的研究成果将为各种平台中的高速环氧乙烷调制器带来许多机遇。
A quasi-matching scheme for arbitrary group velocity match in electro-optic modulation
Group velocity and impedance matches are prerequisites for high-speed Mach–Zehnder electro-optic (EO) modulators. However, not all platforms can realize matching conditions, restricting high-speed modulation in many practical conditions. Here, we propose and demonstrate a quasi-matching scheme to satisfy the group velocity and characteristic impedance matches by cascading fast-wave and slow-wave traveling wave electrodes. The effective group velocity can be flexibly adjusted by changing the ratio of fast-wave and slow-wave traveling wave electrodes. Moreover, the quasi-matching scheme is experimentally verified by demonstrating a 6 mm long EO modulator on a thin-film lithium-niobate-on-insulator platform with a silica cladding. The radio frequency signal insertion loss at the boundary of the slow-wave and fast-wave electrodes is less than 0.12 dB. The measured small signal EO response of the quasi-matched EO modulator drops less than 2 dB at 67 GHz, while the measured small-signal EO responses of conventional slow and fast traveling wave EO modulators drop 4 dB at 67 GHz. The measured 100 Gb/s on–off key signal eye-diagrams of the quasi-matched EO modulator also exhibit an overwhelming advantage over conventional schemes. Therefore, our results will open many opportunities for high-speed EO modulators in various platforms.
APL PhotonicsPhysics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍:
APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.