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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Towards intelligent dual-comb lasers: automatic bidirectional mode-locking via genetic algorithm.

Xiaoyang Shi, Changjian Lv, Qi Yan

|December 19, 2025

Summary

This summary is machine-generated.

Researchers developed an automatically mode-locked bidirectional soliton fiber laser for dual-comb spectroscopy. This innovation simplifies achieving stable single-pulse operation, paving the way for intelligent light sources.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Bidirectional mode-locked fiber lasers are crucial for dual-comb spectroscopy.
Stable single-pulse operation in these lasers is challenging due to complex pulse interactions.
Manual adjustments of laser parameters are typically required, hindering practical applications.

Purpose of the Study:

To demonstrate the first automatically mode-locked bidirectional soliton fiber laser.
To overcome the manual tuning limitations in achieving stable bidirectional single-pulse mode-locking.
To develop an intelligent system for controlling bidirectional fiber lasers.

Main Methods:

Utilized a gold nanofilm saturable absorber for initiating mode-locking.
Developed an iterative multi-stage genetic algorithm for automatic mode-locking.
Employed dispersive Fourier transforms and a feedforward neural network for pulse identification and control.

Main Results:

Successfully demonstrated an automatically mode-locked bidirectional soliton fiber laser.
The genetic algorithm achieved automatic mode-locking using dispersive Fourier transforms.
A feedforward neural network accurately identified bidirectional single-pulse operation.

Conclusions:

This work presents a novel approach to automatically achieve stable bidirectional single-pulse mode-locking in fiber lasers.
The developed intelligent algorithm simplifies laser operation and enhances stability for dual-comb spectroscopy.
This breakthrough opens new possibilities for intelligent dual-comb light source development.