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Updated: Apr 7, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

All-optical frequency division on-chip using a single laser.

Yun Zhao^1,2, Jae K Jang¹, Garrett J Beals¹

¹Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, USA.

|March 12, 2024

Summary

This summary is machine-generated.

This study demonstrates all-optical frequency division (OFD) on a chip, generating high-quality microwave signals using a single laser and synchronized microresonators. This breakthrough simplifies microwave generation for compact photonic devices.

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Area of Science:

Photonics and Optical Engineering
Microwave Signal Generation
Integrated Photonics

Background:

Spectrally pure microwave signal generation is crucial for metrology and communications.
Optical frequency division (OFD) using optical frequency combs offers high-quality microwave generation.
Existing OFD methods are bulky and require complex stabilization, hindering integration.

Purpose of the Study:

To demonstrate an all-optical OFD technique on a photonic chip.
To achieve chip-scale generation of high-quality microwave signals.
To overcome the limitations of current OFD implementations.

Main Methods:

Synchronizing two distinct dynamical states of Kerr microresonators pumped by a single continuous-wave laser.
Transferring the stability of a terahertz beat frequency to a microwave frequency via a Kerr soliton comb.
Utilizing a coupling waveguide for synchronization without electronic locking.

Main Results:

Successfully demonstrated all-optical OFD on a photonic chip.
Achieved OFD factors of N = 34 (227 GHz) and N = 468 (16 GHz).
Reported a 46 dB phase-noise reduction for a 16 GHz soliton comb, achieving the lowest microwave noise on an integrated photonics platform.

Conclusions:

The developed all-optical OFD method is simple, effective, and chip-compatible.
This approach enables the generation of high-quality microwave frequencies on-chip.
Paves the way for compact, robust devices for metrology and communications applications.