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Low-complexity clustered polynomial nonlinear filter-based electrical dispersion pre-compensation scheme in IM/DD
Optics Express
|October 20, 2023
Summary
A new polynomial nonlinear filter (PNLF) scheme offers efficient chromatic dispersion (CD) compensation for optical systems. This low-complexity method significantly reduces computational load while maintaining high performance in intensity-modulation and direct-detection systems.
Area of Science:
- Optical Communications
- Signal Processing
- Nonlinear Optics
Background:
- Chromatic dispersion (CD) significantly degrades signal quality in intensity-modulation and direct-detection (IM/DD) optical transmission systems.
- Iterative algorithms like Gerchberg-Saxton (GS) are effective for CD pre-compensation but suffer from high computational complexity.
- Existing methods struggle to address both linear and nonlinear distortions caused by CD efficiently.
Purpose of the Study:
- To propose a low-complexity, non-iterative CD pre-compensation scheme for IM/DD optical systems.
- To utilize a polynomial nonlinear filter (PNLF) to approximate the nonlinear transfer function of iterative algorithms.
- To investigate the effectiveness of a k-means clustering algorithm for further complexity reduction.
Main Methods:
- Developed a polynomial nonlinear filter (PNLF)-based electrical dispersion pre-compensation (pre-EDC) scheme.
- Integrated the PNLF with the Gerchberg-Saxton (GS) algorithm's iterative process for non-iterative compensation.
- Introduced k-means clustering to the PNLF scheme to create a clustered PNLF-based pre-EDC for reduced complexity.
Main Results:
- PNLF-based pre-EDC reduced complexity by 76.0% and clustered PNLF-based by 97.5% compared to GS-based pre-EDC in simulations (56 GBaud, 80-km OOK).
- Both schemes incurred only a 0.3 dB receiver sensitivity penalty at a 20% forward error correction (FEC) threshold.
- Experimental results (32 GBaud, 80-km OOK) confirmed significant complexity savings (78.3% and 94.2%) with minimal penalty (0.4 dB).
Conclusions:
- The PNLF-based pre-EDC scheme effectively compensates for CD-induced linear and nonlinear distortions in IM/DD systems.
- The clustered PNLF-based pre-EDC offers substantial complexity reduction with negligible impact on performance.
- These schemes demonstrate significant potential for high-performance, cost-effective optical transmission systems.
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