Key Findings
Integrated photonic devices based on thin-film barium titanate (BTO) have demonstrated 1.15 Tbps data transmission over an 80 km link using a dual-polarization phase-quadrature modulator. This achievement positions BTO as a highly promising material for high-speed electro-optic modulators, capable of meeting the immense bandwidth demands of AI data centers.
Technical Details
Barium titanate (BTO) is gaining significant attention as a promising material for next-generation high-speed optical modulators, thanks to its exceptional electro-optic (EO) coefficient and high compatibility with silicon photonics platforms. In this research, BTO thin-film technology was leveraged to develop a dual-polarization phase-quadrature modulator capable of an extremely high data rate of 1.15 Tbps. The device successfully demonstrated stable data transmission over long-distance links spanning 80 km between data centers, proving its capability to handle the massive data transfers required by AI workloads.
The modulator employs a dual-polarization phase-quadrature modulation (DP-QPSK) scheme, allowing for the simultaneous control of both phase and polarization of optical signals, thereby transmitting more information. BTO’s high EO coefficient enables high-speed modulation at low power consumption and contributes to device miniaturization. However, the design faces challenges related to the velocity mismatch between microwave and optical signals, which can limit the modulation bandwidth. The research also explores optimization techniques to mitigate this issue.
Background and Industry Context
The rapid advancements in AI and machine learning have led to an explosive increase in demand for communication speeds within data centers and bandwidth between them. Existing electrical signal transmission technologies are reaching their limits in terms of power consumption and heat generation, accelerating the transition to optical communication. High-speed and energy-efficient optical modulators are therefore essential components for realizing next-generation AI data centers and cloud infrastructure. While thin-film lithium niobate (TFLN) is becoming a prevalent material for electro-optic modulators, BTO, with its even higher EO coefficient, holds the potential to surpass LNO and is attracting considerable attention.
Outlook
The successful demonstration of a 1.15 Tbps modulator on the BTO platform marks a crucial step toward resolving bottlenecks in high-speed optical interconnects for AI data centers. Future research will focus on further reducing the microwave-optical velocity mismatch, enhancing device reliability, and ensuring scalability in manufacturing processes. As BTO technology matures, it is expected to establish new standards for optical communication devices that combine ultra-high-speed data transmission, low power consumption, and miniaturization, further accelerating the evolution of AI infrastructure. Potential ripple effects into other photonics applications, such as quantum information processing and sensor networks, are also anticipated.
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