Joint multi-parameter optical performance monitoring scheme based on trajectory information for a Stokes vector...

Area of Science:

• Optical communication systems
• Signal processing
• Data analysis

Background:

• Accurate optical performance monitoring (OPM) is crucial for advanced optical communication systems.
• Stokes vector direct detection (SVDD) systems require robust methods for parameter estimation.
• Existing OPM techniques may lack efficiency or multi-parameter capabilities.

Purpose of the Study:

• To propose and verify a joint multi-parameter OPM scheme for SVDD systems.
• To leverage trajectory information for enhanced signal analysis.
• To enable simultaneous identification of modulation formats and monitoring of optical signal-to-noise ratio (OSNR) and residual chromatic dispersion (RCD).

Main Methods:

• Quantification of trajectory information from received symbols.
• Application of eigenanalysis for feature extraction and dimensionality reduction.
• Verification using 14/28 GBaud SVDD systems with various modulation formats (BPSK, QPSK, 8QAM, 16QAM, 32QAM, 64QAM).

Main Results:

• 100% modulation format identification rates within reasonable OSNR ranges.
• Low Mean Absolute Error (MAE) for OSNR monitoring (0.03-0.49 dB) and RCD estimation (3.23 ps/nm).
• Successful identification of SVDD signals with varying RCD levels (up to 200 ps/nm).

Conclusions:

• The proposed trajectory-based OPM scheme offers high accuracy and robustness for SVDD systems.
• The method demonstrates effectiveness in joint modulation format identification and multi-parameter monitoring.
• The scheme exhibits robustness to baud rate variations and simpler computational complexity.