Gengxin Chen, Ziliang Ruan, Haiqiang Wei, Haohua Wang, Yanting Zhou, Kaixuan Chen, Kangping Zhong, Changjian Guo, Liu Liu
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First Demonstration of Differential-Drive Push-Pull Modulators on Thin-Film Lithium Niobate
Thin-film lithium niobate (TFLN) based electro-optic (EO) Mach–Zehnder modulators (MZMs) have shown their potential for next generation high-speed optical transmission modules and systems. Unlike modulators on other platforms, most of TFLN based EO MZMs adopt single-drive push-pull configuration. It is more attractive to design a differential-drive and push-pull compatible MZM, which would not only improve the modulation bandwidth, but also facilitate interfacing with electronic drivers. Here, we demonstrate, to the best of our knowledge, the first differential-drive push-pull EO modulator on TFLN using a two-segment MZM structure. By compensating the delay mismatch between optical and microwave signals, the fabricated differential-drive modulator features an ultra-low Vπ of 670 mV and a large extrapolated EO bandwidth of ≈109 GHz. This corresponds to, so far, the best voltage-bandwidth-ratio performance of ≈243 GHz/V2 for TFLN modulators. Both intensity and coherent modulators are built using the proposed structure, and high-speed data transmissions are also demonstrated. This differential-drive MZM structure could promote co-packaging of TFLN based modulators with electronic chips.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.