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Hybrid pruning for nonlinear equalization in short-reach high-speed optical links
Optics Express
|August 13, 2025
Summary
A new Hybrid Pruned Volterra Nonlinear Equalization (HP-VNLE) method reduces complexity in optical communication systems. This approach maintains low bit error rate (BER) performance, offering energy-efficient solutions for high-data-rate applications.
Area of Science:
- Optical Communications
- Signal Processing
- Nonlinear Systems
Background:
- Nonlinear impairments from transceiver components challenge high-speed, low-latency short-reach optical systems.
- Volterra Nonlinear Equalization (VNLE) mitigates these issues but has high computational complexity, limiting its use in energy-efficient data centers.
Purpose of the Study:
- To propose a Hybrid Pruned VNLE (HP-VNLE) that reduces computational complexity while maintaining low bit error rate (BER) performance.
- To investigate the effectiveness of structured and unstructured kernel reduction for VNLE complexity mitigation.
Main Methods:
- Developed a Hybrid Pruned VNLE (HP-VNLE) using structured (center-spread VNLE) and unstructured kernel reduction.
- Analyzed the tap significance in third-order unpruned VNLE to justify pruning strategies.
- Combined the third-order HP-VNLE with a linear equalizer and a 1-tap decision feedback equalizer (DFE).
Main Results:
- HP-VNLE significantly reduces computational complexity compared to unpruned VNLE.
- The performance of HP-VNLE is highly dependent on the initial tap configuration from the center-spread (CS)VNLE.
- The hybrid approach (third-order HP-VNLE + linear equalizer + 1-tap DFE) achieved superior BER performance over unpruned VNLE.
Conclusions:
- HP-VNLE offers a practical solution for mitigating nonlinear impairments in optical systems.
- The proposed method enhances system performance and reduces computational load, crucial for energy-efficient, low-cost data centers.
- This hybrid approach provides a promising solution for optimizing energy efficiency, complexity, and data rates in future optical communication systems.
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