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Two-Stage Carrier Frequency Offset Estimation Using Eigenvalue and Scattering Coefficient ${\mathit{b}}$ in Inverse Scattering Transform
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DOI：10.1109/JLT.2025.3565884.png)
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Abstract
En 中文
Inverse scattering transform (IST)-based transmission is one of the known approaches to overcome the Kerr nonlinearity limit in optical fiber communication systems. IST is known as Nonlinear Fourier transform (NFT) in optical fiber communications. However, the effect of carrier frequency offset (CFO) in digitally coherent receivers induces scattering data shifts in IST. Therefore, fine CFO estimation and compensation are required particularly for multilevel modulation based on IST. This paper proposes a two-stage CFO estimation method using eigenvalue and scattering coefficient $b$ in IST. Numerical simulations and experiments investigate the estimation accuracy of the proposed method. The proposed method provides a high-accuracy estimation and covers a wide range of the CFO. An estimation accuracy of less than 10 kHz error is achieved under pulse period (25.6 ns) and sampling rate (10 GSa/s). Furthermore, we demonstrate that the proposed method is valid even for two-soliton solutions with a multipeak spectrum.
Keywords:
Carrier frequency offset
eigenvalue modulation
optical soliton
$b$ -modulation
Journal
IF:
4.8
Papers:
1.7W
Citations:
3.8W