Self-optimization and auto-stabilization of receiver in DPSK transmission system

Area of Science:

• Optical Communications
• Integrated Photonics
• Signal Processing

Background:

• Differential Phase Shift Keying (DPSK) transmission systems require stable optical components for reliable data transfer.
• 1-bit Dual-Mach-Zehnder Interferometers (DMZI) are crucial components in optical modulation but are sensitive to environmental and operational fluctuations.
• Maintaining optimal performance of optical modulators, like DMZI, often necessitates complex stabilization mechanisms.

Purpose of the Study:

• To propose and validate a novel self-optimization and auto-stabilization method for a 1-bit DMZI.
• To enhance the robustness of DPSK transmission against optical frequency drift.
• To achieve stabilization without requiring additional complex optical or electronic components.

Main Methods:

• Utilizing the characteristics of signal eye patterns to monitor performance.
• Implementing a thermal control mechanism to adjust the optical frequency transmittance of the 1-bit DMZI.
• Maximizing the power difference between constructive and destructive output ports of the DMZI.

Main Results:

• The proposed method successfully self-optimizes and auto-stabilizes the 1-bit DMZI.
• Error-free transmission performance was demonstrated.
• The system maintained stability even with carrier optical frequency variations up to approximately 10% of the data rate.

Conclusions:

• The developed thermal control method offers a simple and cost-effective solution for DMZI stabilization in DPSK systems.
• This approach significantly improves the tolerance of DPSK transmission to optical frequency variations.
• The technique eliminates the need for additional components, simplifying system design and reducing costs.