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Perturbing period-one laser dynamics for frequency-modulated microwave generation with external locking.

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|September 1, 2022

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This study demonstrates a novel method for generating frequency-modulated continuous-wave (FMCW) signals using two lasers, achieving wide tuning and enhanced comb contrast for advanced optical applications.

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Area of Science:

Optics and Photonics
Laser Physics
Nonlinear Dynamics

Background:

Frequency-modulated continuous-wave (FMCW) generation is crucial for applications like optical ranging and spectroscopy.
External locking techniques are employed to stabilize and control laser frequency combs.
Period-one (P1) laser dynamics offer a platform for complex optical signal generation.

Purpose of the Study:

To develop a novel method for FMCW generation utilizing externally locked laser dynamics.
To enhance the performance of FMCW generation through coherent combining of two lasers.
To investigate the interplay between external locking and frequency modulation in laser systems.

Main Methods:

Perturbing the period-one (P1) dynamics of two lasers under common injection.
Employing slow modulation for adiabatic sweeping and fast modulation for external locking.
Coherently combining laser outputs to boost central frequency.
Analyzing the competition between external locking and frequency modulation.

Main Results:

Demonstrated FMCW generation with a 6 GHz sweep range and 42 dB comb contrast.
Achieved a central frequency of 4f0, reaching 80 GHz.
Identified an optimal strength for locking the entire comb despite inherent competition.
Showcased wide tuning capabilities of the central frequency.

Conclusions:

The proposed method successfully generates externally locked FMCW signals with enhanced performance.
The study reveals critical insights into the dynamics of externally locked laser systems.
This technique offers a promising avenue for advanced optical sensing and communication systems.