期刊
PHOTONICS
卷 9, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/photonics9030197
关键词
integrated photonics; thin-film lithium niobate; microwave photonics
类别
资金
- National Key Research and Development Program of China [2019YFB2203802]
In this work, a linearity-enhanced dual-parallel Mach-Zehnder modulator (MZM) on a thin-film lithium niobate platform is reported. By setting specific optical and electrical splitting ratios, the third-order intermodulation distortions (IMD3) of the child MZMs cancel with each other, while the first-order harmonics (FH) reach the maximum. The use of passive devices improves device stability and simplifies operation complexity.
In this work, we report a linearity-enhanced dual-parallel Mach-Zehnder modulator (MZM) on a thin-film lithium niobate platform. By setting the optical and electrical splitting ratios at a specific condition, the third-order intermodulation distortions (IMD3) of the child MZMs cancel with each other, whereas the first-order harmonics (FH) reach the maximum. Passive devices instead of thermo-optical switches are used to control the optical power and phase of the child MZMs, which greatly improve the device stability and simplify the operation complexity. To the best of our knowledge, the experimental results show a record-high spurious-free dynamic range on a thin-film lithium niobate platform (110.7 dB center dot Hz2/3 at 1 GHz). The E-O response decayed about 1.9 dB from 10 MHz to 40 GHz, and the extrapolated E-O 3 dB bandwidth is expected to be 70 GHz. A half-wave voltage of 2.8 V was also achieved. The proposed modulator provides a promising solution for high-bandwidth and low-voltage analog optical links.
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