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 Digital back-propagation optimization for high-baudrate single-channel optical fiber transmissions
Tác giả hoặc Nhóm tác giả: Nguyen V. Dien, Le T. Son, Nguyen V. Tuan, Ho P. Tien, Nguyen D.N. Vien, Nguyen L. Hung, Nguyen T. Hung
Nơi đăng: Optics Communications (SCI,Q1); Số: 491 (2021) 126913;Từ->đến trang: 411-416;Năm: 2021
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
For future high-speed transmission systems, increasing the symbol rate and modulation format orders havebeen considered as a main direction to reduce the cost per bit. On the other hand, increasing the symbolrate and modulation format order leads to increase of fiber nonlinear impairments which limit the systemperformance and reach. Digital back-propagation (DBP) has been considered as one of the most effectivetechniques for combating the fiber nonlinearity. However, conventional DBP scheme employing standardsplit-step Fourier method (S-SSFM) requires high hardware computational complexity which is difficult tomeet in practice. In this paper, we study the effectiveness of the DBP technique for high-baudrate singlechanneltransmission systems and propose an advanced DBP technique based on the optimization of a generalcase of logarithmic step-size and Kerr nonlinearity coefficient. We show that the proposed method improvesperformance significantly in comparison with S-SSFM and the conventional natural logarithmic step-sizetechnique. In particular, for 40 Gbaud DP-16QAM transmission over 2400 km, the proposed method with6 steps/span shows 1.3 dB performance advantage over conventional logarithmic step-size with the samecomplexity. For large data rate (i.e. 160 Gbaud) transmission system, an improvement by 1 dB can be achievedby the proposed technique with 6 steps/span with respect to logarithmic step-size over 2400 km.
ABSTRACT
For future high-speed transmission systems, increasing the symbol rate and modulation format orders havebeen considered as a main direction to reduce the cost per bit. On the other hand, increasing the symbolrate and modulation format order leads to increase of fiber nonlinear impairments which limit the systemperformance and reach. Digital back-propagation (DBP) has been considered as one of the most effectivetechniques for combating the fiber nonlinearity. However, conventional DBP scheme employing standardsplit-step Fourier method (S-SSFM) requires high hardware computational complexity which is difficult tomeet in practice. In this paper, we study the effectiveness of the DBP technique for high-baudrate singlechanneltransmission systems and propose an advanced DBP technique based on the optimization of a generalcase of logarithmic step-size and Kerr nonlinearity coefficient. We show that the proposed method improvesperformance significantly in comparison with S-SSFM and the conventional natural logarithmic step-sizetechnique. In particular, for 40 Gbaud DP-16QAM transmission over 2400 km, the proposed method with6 steps/span shows 1.3 dB performance advantage over conventional logarithmic step-size with the samecomplexity. For large data rate (i.e. 160 Gbaud) transmission system, an improvement by 1 dB can be achievedby the proposed technique with 6 steps/span with respect to logarithmic step-size over 2400 km.
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