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High-security 3D CAP modulation scheme based on a pyramid constellation design for 7-core fiber
Optics Express
|February 24, 2023
Summary
This study introduces a secure 3D carrier-less amplitude and phase modulation (CAP) system for passive optical networks (PONs). The novel encryption method enhances physical layer security with minimal performance impact.
Area of Science:
- Optical Communications
- Physical Layer Security
- Digital Signal Processing
Background:
- Passive optical networks (PONs) require enhanced physical layer security.
- 3-dimensional carrier-less amplitude and phase modulation (3D-CAP) offers high data rates but needs security improvements.
Purpose of the Study:
- To propose and experimentally demonstrate a novel encryption scheme for a 3D-CAP-based PON system.
- To enhance the physical layer security of 3D-CAP-PON systems using a pyramid constellation design.
Main Methods:
- A 3D-CAP modulation scheme utilizing a pyramid constellation design and chaos sequences for encryption.
- Generation of masking factors using a 4D hyperchaotic system and constellation point manipulation via Rubik's cube rotation rules.
- Experimental demonstration of a 25.5Gb/s encrypted Pyraminx-3D-CAP-16 signal transmission over 2 km of 7-core fiber.
Main Results:
- The proposed Pyraminx-3D-CAP-16 signal achieved a sensitivity gain of 0.5 dB compared to the traditional 3D-CAP-16 signal under HD-FEC limits.
- The encrypted signal performance showed negligible difference compared to the unencrypted signal.
- The system demonstrated effective physical layer security enhancement.
Conclusions:
- The proposed Pyraminx-3D-CAP-16 encryption scheme provides a viable solution for enhancing the physical layer security of 3D-CAP-PON systems.
- The method offers a good balance between security and transmission performance.
- The technique has significant application potential for secure optical communication networks.
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