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Fast and adaptive chromatic dispersion compensation scheme for digital coherent systems utilizing two-stage
Optics Express
|July 21, 2015
Summary
A novel two-stage algorithm rapidly estimates chromatic dispersion (CD) in coherent polarization-division-multiplexed (PDM) systems. This method significantly reduces estimation time while maintaining high accuracy for advanced optical communications.
Area of Science:
- Optical Communications
- Signal Processing
Background:
- Chromatic dispersion (CD) is a major impairment in high-speed optical transmission systems.
- Accurate CD estimation is crucial for signal recovery in coherent receivers.
Purpose of the Study:
- To propose and demonstrate a fast and adaptive two-stage algorithm for chromatic dispersion estimation.
- To improve the efficiency of CD estimation in coherent polarization-division-multiplexed (PDM) systems.
Main Methods:
- A two-stage approach combining signal power auto-correlation for coarse estimation and a modified constant modulus algorithm (MCMA) for fine-tuning.
- Simulation and experimental verification in PDM-QPSK and PDM-16QAM systems at various data rates.
Main Results:
- The proposed algorithm achieves sufficient accuracy for 112-Gb/s PDM-QPSK and 224-Gb/s PDM-16QAM signals.
- Experimental validation in a 40-Gb/s PDM-QPSK system confirmed its effectiveness.
- The algorithm requires approximately 7% of the estimation time compared to previous MCMA methods.
Conclusions:
- The developed two-stage algorithm offers a significant speed improvement for CD estimation.
- This fast and adaptive method is suitable for advanced coherent optical communication systems, enhancing performance and reducing overhead.
