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Blind back-propagation method for fiber nonlinearity compensation with low computational complexity and high
Optics Express
|May 15, 2020
Summary
A novel blind back-propagation method effectively compensates for fiber nonlinearity with reduced computational load. This approach enhances performance by accounting for multiple nonlinear effects without prior link information.
Area of Science:
- Optical Communications
- Signal Processing
Background:
- Fiber optic communication systems face performance degradation due to nonlinear effects like self-phase modulation (SPM), intra-channel cross-phase modulation (XPM), and four-wave mixing (FWM).
- Traditional compensation methods often require prior knowledge of the transmission link or exhibit high computational complexity.
Purpose of the Study:
- To propose a blind back-propagation (BP) method for efficient fiber nonlinearity compensation.
- To reduce computational complexity while improving compensation performance compared to existing methods.
Main Methods:
- A step-by-step compensation approach for fiber chromatic dispersion.
- Nonlinear compensation using nonlinear tap coefficients optimized by the nonlinear least square method (NLSM).
- Incorporation of SPM, intra-channel XPM, and intra-channel FWM effects in a purely blind manner.
Main Results:
- The proposed blind BP method achieves nonlinearity compensation with significantly lower computational complexity (less than 50% of conventional BP).
- Improved nonlinearity compensation performance compared to the standard BP method.
- The method requires no prior information of the transmission link, except for the total accumulated chromatic dispersion.
Conclusions:
- The developed blind BP method offers a high-performance, low-complexity solution for fiber nonlinearity compensation.
- This approach enhances the robustness and efficiency of optical communication systems by effectively managing nonlinear impairments.
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