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Nonlinear Fourier transform based optical communication systems with FBMC wave-carriers
Optics Express
|January 29, 2025
Summary
This study introduces the Physical Layer for Dynamic Spectrum Access (PHYDYAS) as a novel wave-carrier for nonlinear Fourier transform (NFT) systems. PHYDYAS enhances achievable information rates and improves noise resilience in optical communications.
Area of Science:
- Optical Communications
- Signal Processing
Background:
- Nonlinear Fourier Transform (NFT) transmission schemes show promise for optical communications.
- Nonlinear Frequency Division Multiplexing (NFDM) offers nonlinearity and dispersion immunity but faces challenges with achievable information rate (AIR) and amplifier noise.
Purpose of the Study:
- To investigate the use of Physical Layer for Dynamic Spectrum Access (PHYDYAS) as a wave-carrier in NFT-based systems.
- To compare the performance of PHYDYAS wave-carriers against Hermite-Gaussian (HG) based NFT schemes.
Main Methods:
- Implemented PHYDYAS, a filter bank multi-carrier (FBMC) method, as a wave-carrier in NFT systems.
- Evaluated system performance based on achievable information rate (AIR) and resilience to inline amplifier noise.
- Benchmarked against traditional sinc-, root-raised cosine-, and HG-based NFT schemes.
Main Results:
- The PHYDYAS-based NFT system achieved a high AIR of up to 7.2 bits/symbol.
- Demonstrated superior resilience to inline amplifier noise compared to HG-based NFT methods.
- PHYDYAS offers a significant improvement over existing NFT wave-carrier approaches.
Conclusions:
- PHYDYAS is a viable and high-performing wave-carrier for NFT-based optical communication systems.
- The proposed scheme effectively addresses limitations in AIR and noise sensitivity of current NFT technologies.
- This advancement paves the way for more robust and efficient optical transmission.
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