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Related Experiment Video

Updated: Oct 30, 2025

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Published on: December 15, 2021

Laser soliton microcombs heterogeneously integrated on silicon.

Chao Xiang¹, Junqiu Liu², Joel Guo¹

¹Department of Electrical and Computer Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.

Science (New York, N.Y.)

|July 2, 2021

Summary

We developed integrated silicon photonic laser soliton microcombs using InP/Si lasers and Si3N4 microresonators. This enables mass production of chip-based frequency combs for high-capacity communication systems.

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Last Updated: Oct 30, 2025

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Photonics and Optical Engineering
Materials Science
Semiconductor Device Physics

Background:

Silicon photonics allows on-chip integration of optical functions.
Integrated laser frequency combs are crucial for advanced optical systems.

Purpose of the Study:

To demonstrate heterogeneously integrated laser soliton microcombs on a silicon platform.
To enable large-volume, low-cost manufacturing of chip-based frequency combs.

Main Methods:

Combining indium phosphide/silicon (InP/Si) semiconductor lasers with silicon nitride (Si3N4) microresonators on a silicon substrate.
Utilizing complementary metal-oxide-semiconductor (CMOS)-compatible fabrication techniques.
Implementing on-chip electrical control for laser-microresonator relative optical phase.

Main Results:

Successful integration of InP/Si lasers and Si3N4 microresonators for soliton microcomb generation.
Achieved a 100-gigahertz repetition rate for single-soliton microcombs.
Observed laser frequency noise reduction via self-injection locking.

Conclusions:

The developed approach facilitates mass production of narrow-linewidth, chip-based frequency combs.
These integrated microcombs are suitable for next-generation high-capacity transceivers, data centers, and mobile platforms.