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Platicon microcomb generation using laser self-injection locking.

Grigory Lihachev¹, Wenle Weng^1,2, Junqiu Liu¹

¹Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland.

Nature Communications

|April 2, 2022

Summary

This summary is machine-generated.

Researchers demonstrate a new type of integrated microcomb called platicons, generated using readily available silicon nitride. This advancement simplifies microcomb generation, paving the way for wider use in photonic integrated circuits.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Nonlinear Optics

Background:

Photonic integrated microcombs, crucial for various applications, have primarily relied on dissipative Kerr solitons (DKS) in microresonators with anomalous group velocity dispersion (GVD).
An alternative approach using normal GVD and localized structures like platicons offers potential for simpler fabrication.

Purpose of the Study:

To demonstrate a fully integrated platicon microcomb using laser self-injection locking.
To explore the potential of platicons for simplified microcomb generation on CMOS-compatible platforms.

Main Methods:

Utilized laser self-injection locking of a distributed feedback (DFB) laser to a high-Q silicon nitride microresonator.
Employed high-confinement waveguides on a thin-film silicon nitride chip with normal GVD.
Investigated multi-platicon states, switching dynamics, and performed optical feedback phase and phase noise studies.

Main Results:

Successfully demonstrated a K-band (microwave) repetition rate platicon microcomb without complex active control.
Observed and characterized multi-platicon states and switching phenomena.
Characterized the phase noise of both the platicon repetition rate and the pump laser.

Conclusions:

Laser self-injection-locked platicons offer a straightforward method for generating microcombs on standard silicon nitride platforms.
This approach simplifies fabrication compared to DKS microcombs, potentially enabling widespread adoption in photonic integrated circuits through commercial foundries.