Photonic crystal cavity IQ modulators in thin-film lithium niobate for coherent communications
arxiv(2023)
摘要
Thin-Film Lithium Niobate (TFLN) is an emerging integrated photonic platform
showing great promise due to its large second-order nonlinearity at microwave
and optical frequencies, cryogenic compatibility, large piezoelectric response,
and low optical loss at visible and near-infrared wavelengths. These properties
enabled Mach-Zehnder interferometer-based devices to demonstrate amplitude- and
in-phase/quadrature (IQ) modulation at voltage levels compatible with
complementary metal-oxide-semiconductor (CMOS) electronics. Maintaining
low-voltage operation requires centimeter-scale device lengths, making it
challenging to realize the large-scale circuits required by ever-increasing
bandwidth demands in data communications. Reduced device sizes reaching the 10
um scale are possible with photonic crystal (PhC) cavities. So far, their
operation has been limited to modulation of amplitudes and required circulators
or lacked cascadability. Here, we demonstrate a compact IQ modulator using two
PhC cavities operating as phase shifters in a Fabry-Perot-enhanced Michelson
interferometer configuration. It supports cascadable amplitude and phase
modulation at GHz bandwidths with CMOS-compatible voltages. While the bandwidth
limitation of resonant devices is often considered detrimental, their
compactness enables dense co-integration with CMOS electronics where
clock-rate-level operation (few GHz) removes power-hungry electrical
time-multiplexing. Recent demonstrations of chip-scale transceivers with
dense-wavelength division multiplied transceivers could be monolithically
implemented and driven toward ultimate information densities using TFLN
electro-optic frequency combs and our PhC IQ modulators.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要