Key Findings
This research proposes and demonstrates an ultra-low-voltage thin-film lithium niobate (TFLN) electro-optic modulator featuring Gaussian-shaped dual-layer electrodes and a high-permittivity cladding. This novel modulator achieves high modulation efficiency and electro-optic bandwidth, successfully supporting 224 Gbit/s PAM-4 signals, thereby contributing to the miniaturization and enhanced performance of next-generation optical communication chips.
Technical & Clinical Details
The developed TFLN modulator dramatically improves the overlap between electric field intensity and the optical mode through an optimized electrode structure and a high-permittivity cladding layer. This innovative design overcomes previous trade-offs between optical loss and bandwidth inherent in existing TFLN modulators, achieving high modulation efficiency and broad electro-optic bandwidth simultaneously at practical levels. Specifically, it is capable of handling high data rate formats such as 224 Gbit/s PAM-4 signals, which represents a significant leap in optical data transmission capacity. This technology is critically important for enabling faster and more efficient data transmission, particularly in data centers and long-haul optical communication networks.
Background & Industry Context
The explosive growth in information traffic necessitates urgent advancements in modulator performance within optical communication systems. Low-voltage, wide-bandwidth, and low-loss modulators are key to reducing power consumption, miniaturizing overall systems, and enabling higher integration densities. Thin-film lithium niobate (TFLN) has garnered significant attention as a material for next-generation high-speed modulators due to its superior electro-optic effect, yet conventional designs struggled to balance modulation efficiency and bandwidth. This research provides a groundbreaking solution to this challenge by introducing a novel electrode structure and cladding material, addressing a critical bottleneck in optical interconnect technology.
Strategic Significance & Outlook
This ultra-low-voltage TFLN modulator holds the potential to significantly enhance the integration density of optical communication modules by facilitating the miniaturization and cost reduction of TFLN-based multi-channel optical transmitter chips. It will enable stable operation at data rates exceeding 224 Gbit/s in both intra-data center interconnects and long-haul fiber optic communications, paving the way for future transmission speeds of 1.6 Tbps and beyond. Ultimately, this will improve the overall energy efficiency of optical communication systems and contribute to building robust infrastructures capable of supporting the sustained increase in high-speed data traffic globally, further cementing photonics’ role in AI-driven data infrastructures.
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