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Photonic on-chip clock distribution networks, data converters, and frequency synthesizers
Our research involves exploring the potential benefits of using an on-chip frequency comb in various applications such as signal processing and quantum sensors. By integrating different elements, including optical frequency combs, significant advancements could be achieved in this field. Recently, we have discovered that photocurrent pulses extracted from an optical frequency comb have excellent timing jitter, which can reach the tens of attoseconds regime [1]. Our particular interest lies in leveraging these excellent noise characteristics of photocurrent pulses for edge-sensitive timing applications. One of our main areas of focus is the on-chip clock distribution network (CDN), which resulted in much reduced heat dissipation while achieving femtosecond-level jitter and skew within CMOS chips for the first time [2]: this result was also featured in Research Highlights of May 2023 issue of Nature Electronics [3].
We are also working on developing a high-speed, high-resolution photonic analog-to-digital converter (ADC) that directly uses photocurrent pulses extracted from electrooptic-modulated optical pulses. Furthermore, we are currently involved in developing a portable atomic referenced optical frequency synthesizer for quantum time sensors, which combines a chip-scale vapor cell, a micro-comb, and an ultra-compact laser stabilization platform.
Related Publications
[1] M. Hyun, C. Ahn, Y. Na, H. Chung, and J. Kim, "Attosecond electronic timing with rising edges of photocurrent pulses," Nature Communications 11, 3667 (2020)
[2] M. Hyun, H. Chung, W. Na, and J. Kim, "Femtosecond-precision electronic clock distribution in CMOS chips by injecting frequency comb-extracted photocurrent pulses," Nature Communications 14, 2345 (2023)
[3] S. Thomas, "Chips with a pulse," Nature Electronics 6, 330 (2023)
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