Accurate chromatic dispersion estimation for Nyquist and Faster Than Nyquist Coherent Optical Systems

Wang, Yongben; Liang, Junpeng; Zhou, Weiqin; Wang, Weiming

doi:10.1364/acpc.2021.t4a.61

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…3 However, the orthogonal transmission criterion limits the further improvement of system spectral efficiency, making it difficult to meet the development needs of ultra-large capacity optical transmission systems. Fortunately, the faster-than-Nyquist (FTN) rate optical transmission technology has emerged, 4 which can obtain multiplexed signals with higher spectral efficiency that exceed the Nyquist rate by compressing symbol intervals in the time domain or channel intervals in the frequency domain, thereby utilizing limited fiber bandwidth resources to achieve faster and higher spectral efficiency data transmission. 5 In recent years, it has become one of the research hotspots in the academic community.…”

Section: Introductionmentioning

confidence: 99%

A PMD-tolerant CD estimation algorithm for FTN coherent optical transmission systems

Zhang,

Sun,

Yang

et al. 2023

Fourteenth International Conference on Information Optics and Photonics (CIOP 2023)

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Section: Introductionmentioning

confidence: 99%

A PMD-tolerant CD estimation algorithm for FTN coherent optical transmission systems

Zhang,

Sun,

Yang

et al. 2023

Fourteenth International Conference on Information Optics and Photonics (CIOP 2023)

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Low-Complexity Chromatic Dispersion Estimation for Faster than Nyquist Coherent Optical Systems

Jiang

Yang

You

et al. 2022

2022 Asia Communications and Photonics Conference (ACP)

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Low-Complexity and Highly-Robust Chromatic Dispersion Estimation for Faster-than-Nyquist Coherent Optical Systems

et al. 2022

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Faster-than-Nyquist (FTN) coherent optical transmission technology is considered to be an outstanding solution to achieve higher spectral efficiency (SE), larger capacity, and greater achievable transmission by using advanced modulation formats in concert with highly efficient digital signal processing (DSP) to estimate and compensate various impairments. However, severe inter-symbol interference (ISI) caused by tight FTN pulse shaping will lead to intractable chromatic dispersion (CD) estimation problems, as existing conventional methods are completely ineffective or exhibit unaffordable computational complexity (CC). In this paper, we propose a low-complexity and highly robust scheme that could realize accurate and reliable CD estimation (CDE) based on a designed training sequence (TS) in the first stage and an optimized fractional Fourier transform (FrFT) in the second stage. The training sequence with the designed structure helps us to estimate CD roughly but reliably, and it further facilitates the FrFT in the second stage to achieve accurate CDE within a narrowed searching range; it thereby results in very low CC. Comprehensive simulation results of triple-carrier 64-GBaud FTN dual-polarization 16-ary quadrature amplitude modulation (DP-16QAM) systems demonstrate that, with only overall 3% computational complexity compared with conventional blind CDE methods, the proposed scheme exhibits a CDE accuracy better than 65 ps/nm even under an acceleration factor as low as 0.85. In addition, 60-GBaud FTN DP quadrature phase shift keying (DP-QPSK)/16QAM transmission experiments are carried out, and the results show that the CDE error is less than 70 ps/nm. The advantages of the proposed scheme make it a preferable candidate for CDE in practical FTN coherent optical systems.

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Accurate chromatic dispersion estimation for Nyquist and Faster Than Nyquist Coherent Optical Systems

Abstract: We propose an accurate blind chromatic dispersion (CD) estimation method for single-carrier coherent optical communication systems. The method can work well even in faster than Nyquist (FTN) system in presence of polarization-mode dispersion.

Cited by 3 publications

References 4 publications

A PMD-tolerant CD estimation algorithm for FTN coherent optical transmission systems

A PMD-tolerant CD estimation algorithm for FTN coherent optical transmission systems

Low-Complexity Chromatic Dispersion Estimation for Faster than Nyquist Coherent Optical Systems

Low-Complexity and Highly-Robust Chromatic Dispersion Estimation for Faster-than-Nyquist Coherent Optical Systems

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