Low complexity, modulation-transparent and joint polarization and phase tracking scheme based on the nonlinear...

Area of Science:

• Optical communication systems
• Signal processing
• Data transmission

Background:

• Accurate tracking of polarization and phase is crucial for high-speed optical communication.
• Existing methods often depend on modulation format, increasing complexity.
• Singularity issues can arise in tracking algorithms.

Purpose of the Study:

• To propose and demonstrate a low-complexity, modulation-transparent joint polarization and phase tracking scheme.
• To address the limitations of format-dependent tracking methods.
• To improve computational efficiency in optical signal processing.

Main Methods:

• Nonlinear Principal Component Analysis (NPCA) based on high-order statistics.
• Joint estimation of polarization and phase using a unitary matrix constraint.
• Simulation and experimental validation of the proposed scheme.

Main Results:

• Successful joint polarization and phase tracking without prior modulation format information.
• NPCA avoids singularity problems due to unitary matrix constraint.
• Comparable Bit Error Rate (BER) performance to format-dependent schemes.
• Fast-tracking capability across a wide range of polarization rotation rates.
• Approximately 30% reduction in computational resources for 16QAM signals.

Conclusions:

• The proposed NPCA-based scheme offers a robust and efficient solution for joint polarization and phase tracking.
• It demonstrates significant advantages in terms of low implementation complexity and computational resource reduction.
• This method is suitable for various modulation formats, enhancing its applicability in optical communications.