Related Experiment Video
Updated: Aug 10, 2025
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
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High-security constellation shaped self-homodyne coherent system with 4-D joint encryption
Optics Express
|February 14, 2023
Summary
This study introduces a secure self-homodyne coherent (SHC) system using constellation shaping (CS) and digital chaos for enhanced optical fiber transmission security. It achieves high security with a large key space and optical-layer protection.
Area of Science:
- Optical Communications
- Information Security
- Signal Processing
Background:
- Self-homodyne coherent (SHC) systems and constellation shaping (CS) enhance transmission capacity.
- CS and SHC infrastructure offer new avenues for encryption.
- Digital chaos provides a robust method for secure data transmission.
Purpose of the Study:
- To propose a high-security and reliable SHC system integrating CS and digital chaos.
- To enhance encryption dimensions for optical fiber communications.
- To provide reliable real-time encryption for future high-capacity interconnects.
Main Methods:
- Generation of chaotic sequences using a four-dimensional hyperchaotic system.
- Application of chaotic sequences for XOR operations, chaotic constant composition distribution matching, phase disturbance, and optical-layer time-delay disturbance.
- Transmission using 64-ary circular quadrature amplitude modulation (64CQAM) format for its unique properties.
Main Results:
- Simulation verified the effectiveness of 64CQAM in a SHC system, showing sensitivity to phase noise and immunity to conventional digital signal processing.
- Experimental verification in a 20GBaud system demonstrated optical-layer security protection via time mismatches (tens of picoseconds) with a large-linewidth laser.
- Digital-layer security was achieved with a key space of 10^127.
Conclusions:
- The proposed scheme offers reliable real-time encryption for optical fiber transmission.
- It provides robust optical-layer security through time mismatches and digital-layer security via a large key space.
- This system is a potential candidate for secure, high-capacity future interconnects in data centers.
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