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Correlated digital back propagation based on perturbation theory
Optics Express
|June 16, 2015
Summary
This study introduces correlated digital back propagation (DBP), a more efficient method for fiber-optic systems. It significantly reduces computational steps without compromising signal quality, improving performance over linear compensation.
Area of Science:
- Optical Communications
- Digital Signal Processing
- Photonics
Background:
- Digital back propagation (DBP) is crucial for mitigating nonlinear distortions in optical fiber systems.
- Standard DBP requires significant computational resources, limiting its practical application.
- The correlation between neighboring signal samples in optical transmissions is often overlooked.
Purpose of the Study:
- To develop a computationally efficient DBP scheme by incorporating signal sample correlation.
- To derive an analytical method for calculating correlation coefficients.
- To evaluate the performance benefits of the proposed correlated DBP.
Main Methods:
- Developed a simplified digital back propagation (DBP) scheme incorporating inter-sample correlation.
- Derived analytical expressions for correlation coefficients using perturbation theory.
- Simulated a 28 Gbaud, 32-QAM, single-channel, single-polarization system over 3200 km.
Main Results:
- Correlated DBP reduces the number of propagation steps by a factor of 10 compared to standard DBP.
- The simplified scheme achieves this reduction without any performance penalty.
- Using only 2 steps per link, correlated DBP improved the Q-factor by approximately 1 dB over linear compensation.
Conclusions:
- Correlated DBP offers a significant computational advantage for optical signal processing.
- The simplified approach maintains or improves performance while reducing complexity.
- This method enhances the feasibility of advanced compensation techniques in high-speed optical systems.
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