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Related Experiment Videos

High-security probabilistic shaping method via chaotic tagging.

Qingwei Wang, Bo Liu, Jianxin Ren

|May 15, 2026

Summary

This summary is machine-generated.

This study introduces a secure 16-7 Quadrature Amplitude Modulation (QAM) method using chaotic tagging for enhanced optical communication. The novel approach improves receiver sensitivity and ensures robust physical layer security with a large key space.

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Area of Science:

Optical Communications
Physical Layer Security
Digital Signal Processing

Background:

Probabilistic shaping is crucial for optimizing optical communication systems.
Existing methods for enhancing security in optical transmissions often compromise performance.
There is a need for integrated solutions that improve both transmission efficiency and data security.

Purpose of the Study:

To propose a novel high-security probabilistic shaping 16-7QAM mapping method.
To enhance receiver sensitivity and physical layer security in optical fiber systems.
To evaluate the impact of chaotic tagging on transmission performance.

Main Methods:

A constellation-level chaotic tagging rule is devised, re-mapping 4-bit symbols to 3-bit modulation symbols.
A Lorenz chaotic system generates a chaotic sequence for a 2-bit tag, forming a constellation-level chaotic tag.
The final output combines signal points with chaotic tags, creating 7 signal points per constellation.

Main Results:

Achieved a 0.49 dB improvement in receiver sensitivity at a 3.8 × 10^-3 bit error rate compared to conventional 16-QAM.
The encryption scheme minimally impacted the probabilistic shaping signal's transmission performance.
The key space reached 10¹⁰⁵, ensuring robust physical layer security.

Conclusions:

The proposed probabilistic shaping 16-7QAM with chaotic tagging offers enhanced transmission performance and strong physical layer security.
The method provides a significant improvement in receiver sensitivity without degrading signal integrity.
This approach represents a promising solution for secure and efficient optical communication systems.